Ipomoea — 20 species

Ipomoea is a wide-ranging genus of around 500 species spanning ornamental morning glories, the edible sweet potato, and vigorous tropical climbers. Most grow fast in full sun — at least six to eight hours of direct light daily — and prefer moderately fertile, well-drained soil that dries slightly between deep, infrequent waterings; established plants are surprisingly drought-tolerant. Toxicity varies across the genus: morning glory species (such as Heavenly Blue and Japanese morning glory) contain indole alkaloids harmful to cats and dogs, while sweet potato vine is listed as non-toxic by the ASPCA. Check each species before buying if you have pets.