A poisonous plant is one that causes some form of damaging reaction . Those effects can be mild to spirit - threatening , depending on the plant life and the soul or pet . Plants can impact pelt , digestion , and full of life organs such as the heart , encephalon and liver . Southern California hosts a variety of plants , and the mood place from U.S. Department of Agriculture plant hardiness zone 5 in mountains to zone 10 in some coastal area . The California Poison Control System lists hundred of known vicious industrial plant .
Step 1
Plants that induce skin reactions have the least serious toxicity rating of 1 from the California Poison Control System . An example is poison oak tree ( Toxicodendron diversilobum ) , with folio that contain an oil that causes an allergic response in most people . An antsy rash and blister are the result . Poison oak grows in many habitats throughout southerly California as either a bush or vine . It grows in USDA zone 5 through 9 . dampen the oil from skin with first fret alcohol follow by abundant cold water . Some plant saps can get hide problems . Succulent genus Euphorbia ( Euphorbia spp . ) have whitened , milky blackjack that rile skin and can cause eye damage . An example is crown of thorns ( Euphorbia milii ) , which grows in USDA zones 8 through 11 .
Step 2
Step 3
Plants with Oxalates
Category 2 toxicant plant check compound called oxalate , which bite the natural language and can cause injury to internal organ . An example is windowleaf ( Monstera deliciosa ) , a tropical plant that grows in USDA zona 10 through 11 . All plant part are toxicant except for the ripe fruit . Some multitude may have reaction to the fruit as well . Calla lily ( Zantedeschia spp . ) , which rise in USDA zones 8 through 10 , contains calcium oxalate in all industrial plant contribution and should n’t be eaten by masses or pets . Native to Africa , callas and their cultivars acquire as borders , edgings or bedding plants .
Plants Rated Moderately Poisonous
toxicant plants that stimulate symptoms including diarrhea , vomiting and sickness but which are n’t life - threatening have a rating of 3 . Yellow bird of paradise ( Caesalpinea gilliesii ) come down in this category because the seedpod and seed contain tannic acid and are toxic if run through . The little Sir Herbert Beerbohm Tree grows to 10 feet marvellous in USDA zone 9 through 11 . Grown for its showy jaundiced flower with foresightful , carmine stamens , icteric bird of paradise is evergreen in mild winter areas . aboriginal California California buckthorn ( Rhamnus californica ) , which grows in USDA zones 7 through 9 , is an evergreen plant , 5 - foot - tall shrub with shining , blue - black berry . The barque and fruit are poisonous because they contain a gastrointestinal irritant .
Plants Considered Seriously Toxic
Plants in the earnestly toxic family can potentially kill someone . Seriously toxic rose bay ( Nerium rose bay ) is widely grown throughout Southern California in USDA zone 9 through 11 . All plant parts , including the ambrosia and smoke from the burning plant , contain compounds that affect the heart . Eating even small quantity of leave or branchlet can hospitalize a person . Sacred thornapple ( Datura wrightii ) is native to Southern California in USDA zones 9 through 11 as a short - lived perennial , and originate as an one-year elsewhere . Showy , large , white , trumpet - shaped flowers are followed by a thorny fruit . All plant voice contain toxic amounts of scopolamine , which affects people , pet and livestock .
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