Oleander: Oleander is a very poisonous herb that, if consumed, can result in vomiting, convulsions, and even death.
Lily of the Valley: Lily of the Valley contains cardiac glycosides, which, if consumed, can result in heart issues and possibly death.
Foxglove: Digitalis, a cardiac stimulant found in foxglove, can result in irregular heartbeat and other heart issues if consumed.
Hydrangea: Cyanogenic glycosides, which are present in hydrangea, can be consumed and result in nausea, lightheadedness, and even coma.
Rhododendron: Grayanotoxins, which are found in rhododendron, can be consumed and result in nausea, vomiting, and possibly cardiac issues.
Daffodil: Lycorine is a compound found in daffodil bulbs that, if consumed in excessive quantities, can result in vomiting, severe stomach discomfort, and even death.
Iris: Iris contains iridin, which, when touched or consumed, can irritate the skin and trigger allergic responses.
Aconite: Aconitine, also known as monkshood or aconite, is a substance that, when swallowed, can cause nausea, vomiting, and possibly cardiac issues.
Wisteria: Lectins found in wisteria can result in fatalities and severe stomach issues if consumed.