Good to know: These 10 plants are extremely poisonous

All parts of the plant are highly poisonous, but the seeds are the most. Swallowing even a few of them can be fatal.

3. Autumn styleless (Colchicum autumnale)

Autumn crocus contains the toxin colchicine, which when ingested can cause bloody diarrhea, severe vomiting, abdominal pain, heart failure and respiratory paralysis. Just 3 leaves can be fatal.

4. Holly (Ilex aquifolium)

Both the leaves and the berries of holly are poisonous. A few berries only cause some discomfort. Eating more than 5 berries can cause severe vomiting, diarrhea and sometimes drowsiness.

5. Lily of the Valley (Convallaria majalis)

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