Belle-de-nuit Ipomoea alba Photo/Illustration: Robert E. Lyons 1 2 3 4 5 6 7 8 9 10 11 Belle-de-nuit (Ipomoea alba) eye-poe-MEE-ah AL-bah Synonyms: Calonyction aculeatum Genus: Ipomoea This twining perennial has evergreen, oval or rounded, mid- to dark green leaves. Fragrant, 6-inch white blooms appear in early summer to fall, opening in early evening. Noteworthy Characteristics: Seeds are highly toxic if ingested. Care: Grow in moderately fertile, well-drained soil. Provide support. Shelter from cold, drying winds. Propagation: Chip seeds or soak for 24 hours before sowing. Sow seed in spring. Root softwood cuttings in spring or summer, or semi-ripe cuttings in summer. Problems: White blister, rust, fungal leaf spots, stem rot, thread blight, charcoal rot, and wilt. Overview Height 10 ft. to 15 ft. Light Full Sun Only Moisture Dry to Medium Characteristics Fragrant Flowers, Showy Flowers Bloom Time Fall, Summer Flower Color White Uses Ground Covers, Poisonous, Suitable as Annual, Trellis Seasonal Interest Summer Interest Type Perennials Ipomoea albaView the discussion thread.