Crocus-like blooms appear in fall on bare stems without leaves. Plant them and forget them, they will surprise you every September.
Seriously toxic to cats and dogs, and to horses. Eating it can cause bloody vomiting, diarrhoea, shock, damage to several organs and suppression of the bone marrow. Treat any ingestion as an emergency and get to a vet.
Every part is highly poisonous, and the corms are sometimes mistaken for onions or garlic. There is no reliable antidote, so treat any ingestion as an emergency.
For gardeners who like to stay ahead.