An observation platform for watching the world go by. Additionally, the poinsettia's white sap can cause skin irritation, swelling, and redness around the mouth. Also, be advised that the consumption of any plant material may cause vomiting and gastrointestinal upset for dogs and cats. Eating silica gel in packets could cause a tummy upset, so you do need to be cautious. or if you are strong wish to have one from the above-mentioned list, you need to cautious about few things. Rodenticides can be toxic for your cat, either by coming into contact with the poison directly or by eating a mouse that has been poisoned. There are many plants that are poisonous to cats, and many others that are completely fine. Another from the Kalanchoe family, known as Alligator Plant, deserves a mention in the list for your query are succulents poisonous to dogs? Camellias. Although you might find that your cat is disinterested in eating them, there is always a risk that they may come into contact with the flower's pollen by rubbing up against it and absent-mindedly licking their fur.Unfortunately there are several types of lilies that are poisonous to cats, including Easter Lily, Tiger Lily and other members of the lily family.All parts of the lily plant are toxic to cats if ingested, and consuming small amounts can result in severe poisoning. If you're unsure whether a plant or flower is poisonous to your cat, if you're keen to find plants and flowers safe for cats, or if you suspect your cat may have been poisoned, we have guidance and vet-approved lists to help you. Diarrhea. If you suspect your cat has ingested any part of a daffodil, please seek advice from your vet immediately. Whatever you do, don't panic, as this won't help anyone! , you want to more careful. Beneficial insects, Does not attract If your veterinarian thinks your cat needs to be made to vomit, they will do this at the clinic. Squill Scilla species Harmful if eaten in quantity. A scratching post or natural stumps and branches. By providing my mobile number, I agree to receive 2-4 text messages per month from the ASPCA, which may include requests for charitable donations. The star-like appearance makes them a perfect choice for your interiors and looks good in hanging pots. Dracaena These decorative plants are also called female dragons and are toxic to cats. Common household plants generally come from all over the world. Dogs, No reported toxicity to While your feline friend probably loves the occasional scrap of chicken, many human foods are actually toxic to cats. Yes, calla lilies are still toxic to cats. Are Clematis Poisonous to Other Animals A securely fenced area the size of a balcony or screen porch provides plenty of space for cat-friendly plants, climbing and resting platforms, hiding places, water features, and play space. How to help a cat lose weight, Why is my cat hiding? The toxic principle of this plant is cycasin. While uncommon, in some cases, the packet could block your cats gut (an obstruction). If your cat has only just eaten a large packet and your veterinarian is worried about a blockage happening, they may choose to make your cat vomit. Milk and dairy products Contrary to popular belief, most cats . Lilies are the top of the list for plants poisonous to cats. Ingestion can cause diarrhea and vomiting. Toxicity. It's worth noting that while lilies are especially toxic to cats, there are several plants that can cause varying degrees of illness to feline friends. Keep in mind that even non-poisonous flowers for cats can cause some gastric upset. Silica gel is a water-absorbing material used in packaging to keep products dry. 1. So, which plants are poisonous to cats? Therefore, grow the silver squill plant in a hanging container where your pets are unable to reach it or in a room where your pets are not allowed. Toxic Properties: Saponins, anthraquinones. But having a pet in your house is perhaps making you halt and think are succulents poisonous to cats? Although some plants are only poisonous in part (leaves, stems, seeds, twigs or roots) it is always safest to assume that if a plant is toxic at all, the entire plant is toxic. Most of the problems arise on ingestion of these succulents by the pets leading to stomach infection. Rather than the gel being harmful, its the packets containing the gel that can cause issues for your cat. Plants are notated first by scientific name, followed by any common names. The plant includes toxins which might lead to renal failure, which may prove fatal for cats. If your cat is panicked and unable to breathe, you must get them to a veterinarian as an absolute emergency straight away. Message and data rates may apply. Small round batteries, like those found in hearing aids, can be easily swallowed. When you buy via links on our site, we may earn an affiliate commission at no extra cost to you. What You Need to Know. Some plants can actually be poisonous for cats and cause them harm. So, is silica gel dangerous for cats? Although the ASPCA doesn't consider mandevilla plants toxic, other plants in the same family are poisonous to pets such as cats and dogs. The most toxic part of the plant is underground, so if you do choose to have begonias in your yard, keep them out-of-reach from pets, especially those that like to dig. Beyond household cleaners, some popular wellness products can also be toxic to cats. If you own a cat and wondering are succulents harmful to cats then you first need to know how a succulent can harm your pet. Pet Poison Helpline, 855-764 . The quotient that makes it fall under the category of succulents that are poisonous to cats is the presence of calcium oxalate which causes irritation to the body tissues. While most cats aren't interested in eating grapes or raisins, some find the stems interesting or like to chase them on the floor, which can lead to ingestion. These 14 cheap landscaping updates make a big splash. This will help your vet determine the precise toxin. This will stop them from jumping onto the pot as it will swing if they try to do so, just make sure that none of the leaves or petals are within reach. Common Names: Mauna Loa Lily, Peace Lily plant. A kind of steroid, diagremonteanin, is present in the plant which is not at all friendly to your pet. They may charge you a consultation fee of $65 by credit or debit card. While poisoning in cats is no more common than poisoning in dogs, it can often result in more severe symptoms. There are between 150 and 200 varieties of Kalanchoe hailing from various parts of the world, including Australia, Madagascar, and Africa. No reported toxicity to My Cat Ate Rat Poison! Many varieties of day lilies, are toxic to cats only. Common Names: Pothos Ivy plant, Devils Ivy, Taro Vine, Ivy Arum. If you enjoy having fresh bouquets or floral displays in your home, Provide cat grass for your cat to nibble instead, Keep bulbs such as tulips and daffodils out of reach. Thankfully, there are lots beautiful, pet-friendly petals you can use, including freesias, roses and snapdragons. , you might also be worried thinking if your pet engulfs a portion from your plant. Siberian squills are perfect for naturalising in lawns and areas of semi- shade, particularly beneath deciduous shrubs and trees. However, it's a very toxic plant for cats (and dogs) due to the presence of the chemical lycorine. Great newsthere is no need to worry. Ingestion of even a small amount can cause drooling, stomach pain, diarrhea, depression, and death. Here are some of the most poisonous plants for cats: Please keep in mind that this is by no means a definitive list. Garlic and onions can cause anemia in cats Sitemap While daffodils are a beautiful sign of spring, they are unfortunately dangerous for our feline friends. In case they do not have a thing to grab onto, they will surely poke your toxic cactus plant. Here is a list of 10 safe plants for cats, dogs, and pets. Ingestion can cause oral irritation and burning of the mouth and throat, drooling, vomiting and trouble swallowing. When a cat does become unwell, it is usually because something has brushed on their fur or paws, which they have then ingested while grooming. Its easy to see that taking proactive steps by ridding your home and garden of toxic plants and providing plenty of environmental enrichment in the form of toys, safe plants, and enjoyable garden space is a great way to keep your cat safe. ExcitedCats is reader-supported. According to the American Society for the Prevention of Cruelty to Animals, possible reactions include vomiting, diarrhea, and tremors. It is quite mysterious as to what makes it fall in the category of cacti which are succulents poisonous to cats, maybe because of its rubber-like stems. Boredom also has a part to play. In much the same way as humans get allergic to certain things, pollen, needles, flowers, leaves, sap, and even seeds can all be potentially toxic if ingested by a cat. They may not be as toxic as the members of the true lily family, but they can still be dangerous to cats when they are consumed. Scilla siberica is known for attracting bees. Horses, No reported toxicity to Heres What to Do (Vet Answer), What NOT to Do if Your Cat Has Eaten Silica Gel, Cat Nail Biting: What to Do If Your Cat Chews & Pulls His Claws, Why Is My Kitten So Hyper? Cats are more sensitive to onion toxicosis than dogs and initial clinical signs can be very vague and non-specific. The kind of plants you have if its a succulent, remember to tell its name. Cardiac glycosides are the toxic principles of this plant. Poisoning in cats is therefore generally rare. The flowers of this plant are reddish, pinkish or whitish in shade giving it a colorful outlook. You might be wondering that when it is sounding beneficial, what makes the snake plants toxic to cats. Planning to own a succulent to decorate your home garden? Shocking but true, this is indeed a poisonous cactus and can affect your pet. This toxin inhibits the bodys ability to process protein. Calla lilies contain a compound known as insoluble calcium oxalates, which is a crystal that is known to cause serious irritation to the tissues. Batteries can prove dangerous in more than one way. Signs of poisoning include depression, vomiting, swelling of the face and paws and a bluish discolouration of the skin. To provide grass for your cats, you can either buy a section of turf at your local garden center and plant it in shallow planters or sow bird seed in containers of potting mix. [source]. Generally, flower food contain things like sugar and citric acid, along with (very) little bleach to reduce bacterial growth. People. However, the information found on Excited Cats should not be viewed as veterinary advice. How Do You Know If Your Cat Has Eaten A Toxic Plant? Common Names: Buddhist Rosary Bead, Precatory Bean, Weather Plant, Seminole Bead, Indian Licorice, Indian Bead, Rosary Pea, Lucky Bean, Love Bean. Quick action is imperative if your cat is showing signs of poisoning. Having known this you would certainly like to figure out which succulents are poisonous to cats or the pet you own. Your cat might exhibit vomiting, diarrhea, lack of appetite, and staggering after eating a toxic plant. Cats don't like coffee, and will stay away from a plant that is surrounded by coffee grinds. How to design the perfect cat diet, Lily of the valley (pretty much any Lily, to be honest). Cats Protection is a registered Charity No. Common Names: Narcissus, Daffodil, Jonquil, Paper White. scilla mischtschenkoana, wolf's bane) Agapanthus* (African blue lily) Allium (ornamental onion, garlic, lily leek) . Unless other issues exist within the cat, gastrointestinal distress is the most common response after too much plant material has been ingested. , you must also know that cats are very curious about things that are around. Indeed, if you want a more exhaustive and complete list of plants that are poisonous to cats, check out this resource from Purina. The reactions you can expect vary from mild to extreme and, in some places, deadly. "Easter lilies are very dangerous for cats . Your veterinarian will examine your cat, and if they think there is a blockage (obstruction), they will recommend further tests. Potential symptoms of chocolate toxicity include heightened thirst, vomiting, diarrhea, lethargy and muscle tremors. Chairs and benches for you to sit on and your cat to hide under. In some severe cases, dogs can even suffer a drop in blood pressure, go in to a coma and die. Roses. A child who attempts to eat silica gel may actually inhale some of the beads, causing severe lung irritation, shortness of breath and coughing. "Essential oils can be very irritating to cats' airways, and salt lamps are poisonous if licked," Dr. Irish said. The best way to prevent your cat from being poisoned is simply to not have lilies in your home or garden. Even in large quantities, the gel is not toxicit might irritate the gut and cause vomiting or diarrhea. Otherwise, provide a little cathouse or two so that your cats can enjoy the garden year round. Text STOP to opt-out, HELP for more info. Cats exposed to this toxin may experience shaking, drooling, vomiting, diarrhea and abdominal pain. If a cat eats very many Calla lilies, the toxins from the plant can cause serious health problems for the cat, including swelling in the mouth, esophagus, and stomach. Any product that will spoil if it gets moist is likely to be packaged with silica gel. The reactions you can expect vary from mild to extreme and, in some places, deadly. Produces pretty flowers which are popular with insects, Zinnia old favourite with plenty of colours. Since symptoms are usually mild, cases often go unreported. Common Names:English Ivy, Glacier Ivy, Branching Ivy, Needlepoint Ivy, Sweetheart Ivy, California Ivy. If you have evidence of what your cat has eaten, take a sample to the vet. Spot-on flea treatments for dogs - many contain Permethrin, which is poisonous to cats. Cover photo: 123rf / Liudmilachernetska & Florian GIORGIO / Unsplash (TAG24 Edit), 123rf / Liudmilachernetska & Florian GIORGIO / Unsplash (TAG24 Edit), How heavy should my cat be? Cats love empty cardboard boxes, but please be cautious when leaving them around for your cats, as there could be small silica gel packets lurking in the bottom. Avocado (only mildly toxic to dogs and cats, but can be severely toxic, even deadly, to birds, rabbits, horses, and ruminants such as cattle, goats, and sheep) . At Excited Cats, we regularly consult with licensed veterinarians and other industry experts. Thankfully, if the container/vase that cut flowers are put in is clean, and the water is clean and refreshed regularly, the vase life of the flowers will be just as good. They will use drugs to do this and monitor your cat carefully. is scilla poisonous to dogs. Signs your cat might show if hes unwell from eating silica gel: Usually, cats are fastidious about burying their poop in loose earth, sand, or their litter tray. This is unusual but can happen. If you have indoor cats, a small, secure cat garden can add fun to your cats life and yours! A blockage of the gut is an emergency. Buddleia common garden shrub/small tree with spikes of flowers throughout the summer white through to mauves and purples. Any plants or flowers marked as caution-advised should be kept out of reach, particularly if your cat is a nibbler. The toxins are more concentrated in the leaves that in the berries. If you catch your cat eating a plant, and you are unsure as to whether the plant is poisonous, naturally you will want to put a stop to the activity. About Cats Protection Triterpenoid saponins make up the toxic principles of this plant. Receive small business resources and advice about entrepreneurial info, home based business, business franchises and startup opportunities for entrepreneurs. Hibiscus various varieties as both garden and some less hardy conservatory plants/small shrubs, Hollyhock old cottage garden favourite, many colours and generally grown as an annual/biennial. Drooling is also a common symptom associated with most types of poisoning. Perennial shrubs, climbers and ramblers. Make your garden and enclosure as nice looking as possible so as not to inspire wrath from your neighbors. This is why most succulent lovers end up doubting are succulents kalanchoe poisonous to cats or not, but sadly they are. It is a bitter truth to know that these beautiful plants are succulents poisonous to cats. The plants start growing at any place wherever they are landed because of their fast-growing nature and tolerance to heat. You can grow these nine butterfly flowers from seed. There is greater risk within the home as it is a confined area and a bored or curious cat might investigate an indoor plant or a cut flower display by nibbling. Related: Are Golden Pothos Safe For Cats? . Alternately, you can call the ASPCA Animal Poison Control Center Phone Number: (888) 426-4435. Castor Bean ( Ricinus communis) Chrysanthemum, Daisy, Mum ( Chrysanthemum spp.) Cat Nail Biting: What to Do If Your Cat Chews & Pulls His Claws, Why Is My Kitten So Hyper? Insoluble calcium oxalates are the toxic principles of this plant. The trouble is, cat-proofing your house is difficult. If you see your cat playing with or eating a silica gel packet. The Calla Lily Raw eggs. If you believe that your animal is ill or may have ingested a poisonous substance, or if you have any further questions regarding the information contained in this database, contact either your local veterinarian or the APCC 24-hour emergency poison hotline at 1-888-426-4435. RH17 7TT, Familiarise yourself with house plants poisonous to cats and avoid having these in your home altogether, Be wary of advisory plants and either avoid these or keep them well out of reach of your pet, especially if your cat is a nibbler. This list also includes the toxic principle of each type of plant. The plants are long-lasting shrubs with greenish leaves having a tinge of grey. Writer and editor with a background in news writing, editorial and column writing and content marketing. This video introduces four plants not toxic to cats! In minor cases, plants toxic to cats can cause gastro upset or skin irritation, but in serious cases, it can lead to organ failure, seizures, or even death. Hence the saying Curiosity killed the cat!. Joanna is an experienced veterinarian working in the UK. If you are having these succulents and cats, mark Kalanchoe Delagnoesis as one which is succulents poisonous to dogs and cats. It comes in little paper bags or plastic tubes, and the contents look like tiny clear beads. Toxic Caution advised * COM_7106 Cats and dangerous outdoor plants . If your precious cat consumes even the tiniest amount of holly berries, be on the lookout for any indications of an upset stomach. We'll respect your privacy and unsubscribe at any time. As a result, it is best to keep no monsteras around the house, as cats can get extremely sick if they consume any part of this plant, whether it be a leaf or a twig. The Siberian squill, Scilla siberica, is native to Russia and the Caucasus region, and is therefore very hardy and vigorous. If you're not sure where to start in finding houseplants safe for cats, there are lots of online retailers offering feline-friendly options,meaning you can still enjoy gorgeous greenery without your cat coming to any harm. The California Poison Control System is available 24 hours a day at 1-800-222-1222. Not at least by its cute name. Find out more about plants poisonous to cats in our guide. If your cat is vomiting or has diarrhea after eating silica gel but is still eating and behaving normally, your vet might simply treat your cat for a tummy upset. Luckily, they are not true lilies, which can result in kidney failure, but they are still toxic to cats and dogs. Ingestion of any part of the plant may result in drooling, vomiting, diarrhea, tremors, irregular heartbeat, low blood pressure and seizures. Well, the nature of your pet to find your succulent plant is because of its playing habits. Within 12 to 24 hours, the cat . To know more about a succulent plants nature or whether it is toxic to your pet you can call the ASPCA (American Society for the Prevention of Cruelty to Animals) Poison Control Center or give a ring to the Pet Poison helpline. Refer to the information presented here to provide your cat with a safe, enjoyable home. Signs your cat has eaten this plant: Vomiting Diarrhea Weakness Drooling Abdominal pain Loss of appetite Abnormal heart rate Depression Tremors Seizures Temporary loss of sight 5. Lilies are particularly toxic to cats. The desire for owning one has always been high for plant lovers but you need to do full research on are succulents poisonous to dogs and cats? Initially an affected cat may develop vomiting and/or diarrhea accompanied by loss of appetite. In extreme cases, oleander can cause muscle tremors and fatal heart abnormalities. Show your pet some love with these 40 DIY pet projects. In other words, while certain plants might be beautiful, and rather desirable, there are plenty of alternatives to choose from, and you shouldn't put your kitty at risk. Look for itchiness, swelling, and redness. Toxicity Ranking: moderate to severe. Observe your cat closely over the next couple of hours. The cacti having biblical relations, also known as Crown of Thorns, are succulent plants poisonous for pets. Care should be taken when purchasing house plants, as varieties such as cycads, cheese plants and aloe vera are not cat-friendly. And some can present other challenges, like a rose with its prickly stem. Top 10 Poisons for CATS - Beware 1. Is your monstera dangerous to your cat? However, there are other plants and flowers, both indoors and outdoors, that can be harmful to cats.Will cats eat poisonous plants?Most cats are very wary of eating anything unusual, which means plant poisoning cases taken to the vets are rare. Excellent for butterflies so cats like it too! Daffodil bulbs contain crystals that are extremely toxic to cats if eaten. This applies not only to humans, but also to pets such as dogs or cats. Other types of nuts, including almonds, pecans, and walnuts, are rich in oils and fats that can cause digestive upset and potentially even pancreatitis in cats . Elder (leaves, root, bark) Sambuccus species . And fortunately, most are considered safe for cats. Shocking but true, this is indeed a . While the gel is considered edible . Well, to be honest, if both succulents and your pets coexist, then there are chances that they can get poisoned despite your precautions and carefulness. If your kitty has consumed a poisonous plant, you need to get immediately in touch with your veterinarian (or the APCC) and describe what it has eaten, how much, and what symptoms it is exhibiting. The information is current and up-to-date in accordance with the latest veterinarian research. If a cat for some reason accidentally eats one of these packs, she may experience some very slight tummy troubles. Is Scilla siberica poisonous? If you find any symptoms straight away ring down your veterinary doctor. You can grow these nine butterfly flowers from seed. Most importantly, don't panic. Many tummy upsets get better with little or no treatment, but your vet should rule out a more serious issue. This is due to several factors, including: Their relatively small size. Spring blooming bulbs are generally toxic. In worst cases, your dog might start having irregular heartbeats or even seizures. Succulents can be easily potted and planted at home and with fewer efforts, you can conserve and grow one of them. . Sometimes cats can get mild tummy upsets but nothing more. It has designer yellow bordered leaves that contain Aponins, causing mild toxicity to your housemate if engulfed. The margins and the tips have a spot in brown and also white hairs. Maybe the room of the place where you have decided to keep your succulent, you have to be careful and take measures so that your pet does not reach that spot. If your cat happens to eat a toxic succulent, Renee Schmid, DVM, DABVT, DABT, and Senior Veterinarian Toxicologist at the Pet Poison . Single flower varieties good for insects, many scented, Sunflower popular with kids as some will grow huge in a few weeks and then huge yellow/orange/red blooms which once seed is set, provide good source of food for garden birds, Valerian produces a similar effect to that of catmint, commonly available in garden centres. These foods are typically poisonous when eaten in large quantities, but exposure to concentrated forms of onion or garlic, such as onion soup mix or garlic powder, can also be toxic. As well as hazardous plants and flowers, there are items around the house that can cause poisoning in cats. 1. Common Names: Coleus, Indian Borage, Spanish Thyme, Stinging Thyme, Country Borage, East Indian Thyme, Bread and Butter Plant. On the whole, the expert consensus is that poinsettias are not poisonous to cats or dogs - or at least not to a concerning degree. Let me help you providing by listing some toxic succulents for you. Mandevilla is part of the dogbane family (Apocynaceae), as . If your vet recommends either or both of these courses of action, be sure to take the advice seriously and follow his or her instructions closely. This brings us to the end of todays discussion. It grows easily everywhere and causes a fatal reaction to your pets if consumed. Aloe (Aloe Vera) Aloe Vera is treated like a celebrity in terms of herbal healthcare but it also raises eyebrows for pet owners thinking are Aloe Vera plants poisonous to cats and other pets. This is even true (or perhaps especially true) if you have hanging plants as they can be very tempting to playful kittens. Sometimes, if an inedible object has been eaten within the previous few hours, making a cat vomit is an appropriate way of getting it out before it causes a blockage, but this should only be done by a professional veterinarian. Apart from your query are succulents poisonous to cats, you might also be worried thinking if your pet engulfs a portion from your plant. But then there is a high chance that your canary will fly from its cage, if open, and bite its leaves causing some health issues to itself. You can make these 15 clever pet products at home. Privacy Policy Legal Info, Underwritten by United States Fire Insurance Company. Symptoms include excessive thirst and frequent urination, cloudy and/or bloody urine. Silica gel is not harmful when swallowed. Common Names: Exotica Perfection, Dumb Cane, Tropic Snow, Exotica. These 11 household items are seriously hazardous for pets. Grown usually as an annual for containers, baskets etc. In case you have a pet cat, you might wonder what succulents are poisonous to cats. The plants bulb is the most toxic. The exact toxic dose and the precise toxins responsible for renal damage are currently unknown. Here's a list of common household items that are poisonous to cats: Bleach; Prescription medications; Pain medications; Causing similar symptoms to both snake plants and monsteras, aloe vera is a very toxic substance to cats and dogs alike. Here are 10 drought-tolerant landscaping ideas to try this year. If you already own a cactus plant and wondering. While doing so, take steps to identify the plant and determine whether or not it is toxic. Chocolate can cause seizures and death in dogs . How to lure a cat out from its hiding place, Cat allergy symptoms, treatments, and causes, Cat anxiety: Symptoms, treatment, and separation anxiety, What to do if your cat eats a poisonous plant, How to keep your cat away from poisonous house plants, There are plenty of safe plants for cats, so you have options, What can cats eat? Toxic Principle and Mechanism of Action. It should be pointed out that the whole plant-petals, stamen, leaves, and pollen are toxic. Some of them, though, might be very bad for it. 2-for-1 entry to Kew Gardens, Warwick Castle, Leeds Castle and many more. Here are some helpful recommendations for you. Chelwood Gate, Petunias. Never give your pet any pills without first talking to your vet, though -- it's easy to give them the wrong medicine or too much, which can kill them. There are many, many plants that are poisonous to cats. Although not all are toxic to your pets, it is good to know about the toxic ones before you purchase one from the marketplace. If you suspect your cat may have ingested any part of the lily plant, please seek advice from your vet immediately. Well, let me clear you out on the query are succulents poisonous to cats? Butterflies/Moths, Does not attract This is the best way to eliminate lawn weeds. The problem, though, is that kitties don't have the same smarts or sense of self-preservation we do, and they'll nibble on things that'll make them sick. Individual plants may differ in appearance from the photos used on our listings. Kittens are like toddlers; they are endlessly excited by all of the new and interesting things they encounter minute-by-minute. The University of California states its sap as the main contributor to its toxicity causing skin problems in cats and dogs. The Sliver Squill is highly toxic to pets . Ingesting even a very small number of beans or amount of foliage can cause burning of the mouth and throat, loss of appetite, bloody diarrhea, trouble breathing, trembling, excessive thirst, kidney failure, CNS depression, loss of coordination, fever, weakness, convulsions, coma, and death. But for this plant, its milky sap contains toxic latex which is very toxic and induces irritation, so containing its a big NO from me to have these around your pets. Can Adult Cats Eat Kitten Food? You can also make a separate arrangement for both of them. For a complete list, see this ASPCA article: This is just a brief list of plants toxic to cats.