Many houseplants such as Calathea, Ferns, Caladium, African Violets, and Prayer Plants prefer high humidity. The 40 to 50 percent humidity levelThese are general guidelines that describe different poisonous plant toxicity levels. It's possible for an allergic reaction to occur from contact with any houseplant, toxic or non-toxic. If there is ever a concern, call: Poison Control Center: ******1-800-222-1222****** Level #1: Houseplants with low toxicity, may be mildly irritating, especially the sap of the plant. Level#2: Houseplants with medium to severe toxicity. Eating parts of these houseplants may result in vomiting, diarrhea, stomach pains, skin irritations, and breathing difficulties. Level #3: These houseplants are very poisonous. When eaten, especially in large quantities, severe vomiting, diarrhea, stomach pains, skin irritations, and breathing difficulties can occur. Level #4: These houseplants are extremely poisonous. Eating parts of these houseplants can be be life threatening. Every plant listed in our Popular HousePlant guide has a section explaining whether or not it is toxic and, if so, how dangerous it is. Amaryllis, alocasia, dieffenbachias, crotons, ivies, azaleas, lilies, and philodendrons are just a few of the highly poisonous plants we use in our homes and offices all of the time. If you don't know whether your houseplant can pose a threat, send an email to Ask Judy@HousePlant411.com. Include a picture of your plant and a description. Judy will let you know if the houseplant should be kept away from small children and pets. See colorful pictures and get more information about poisonous houseplants in my book Don’t Feed Me To Your Cat! A Guide to Poisonous Houseplants some houseplants like is rarely found in our homes and offices. During winter months, the humidity may be as low as 10-20%. Misting houseplants is not the solution to this problem. Misting does not increase the humidity in the air; it just wets the leaves so the plant doesn’t lose as much water. The down side is that leaves that are constantly wet fall prey to bacterial and fungus infections that often destroy the entire plant.
If you want to increase the humidity in a room just install a humidifier; a small one for just one room a large one connected to your heating system for the entire house. There are also simple little things you can do to increase the relative humidity around houseplants. Place your plants on wet pebble trays. Just fill a tray with gravel and water and set your plant in it. Be sure the plant is sitting on the gravel and above the water line. You never want a houseplant to be sitting in water all of the time. You can also just group your plants together. As the plants transpire, give off water through their leaves, the humidity around them increases causing a mini greenhouse effect.