Trillium grandiflorum aka Great White Trillium

Trillium grandiflorum is a spring woodland perennial in the Melanthiaceae family. Common names include great white trillium, wood lily, and wake-robin. It grows wild across much of eastern North America. Its range runs from Quebec and Ontario west to Minnesota. It extends south to Alabama and Georgia. It grows in rich woods, thickets, and moist forest slopes.

Plants rise from underground rhizomes and form upright clumps. Garden plants often stand 0.7–1.5 feet [0.2–0.46 metres] tall. RHS gives an upper height of 1.6 feet [0.5 metres]. NC State reports plants reaching 3 feet [0.91 metres]. Spread ranges from about 1–1.6 feet [0.3–0.5 metres]. Each stout, unbranched stem bears three broad green bracts. These look like leaves and have clear veins and smooth edges. Their surfaces are glossy, and their shape is oval to egg-shaped. The smooth stems may show a pale red tint. The foliage falls away each year.

A single flower stands above each whorl of bracts. Three broad petals overlap at the base of the bloom. Flowers measure about 0.17–0.33 feet [0.05–0.10 metres] across. White petals turn pink as the bloom ages. Flowers appear in April and May in North Carolina. Chicago lists a wider season from March through June. Native bees and honeybees visit the flowers for nectar. Six-parted, berry-like capsules follow, and ants carry away the seeds. Fruit appears in July and August in North Carolina. Sources differ on fruit colour, reporting white or red.

Grow this plant in partial or deep shade. It needs deep, humus-rich soil that stays moist but drains well. Acid to neutral soil suits it. Water regularly and add leaf mulch in autumn. Sources list USDA zones 3–9 and UK hardiness H5. Its slow spread suits woodland beds and shaded borders. Groups provide spring flowers beneath trees and shrubs. Leave clumps undisturbed, since they transplant poorly. Plants grown from seed may take five to seven years to flower. No pruning is needed.

Slugs and snails can damage plants. Leaf spot, rust, and smut may occur, though serious problems are uncommon. Sources record young leaves as edible after cooking. PFAF rates their food value low and records traditional root remedies. Safety reports conflict: PFAF lists no known hazards. NC State flags the fruit for low-severity poisoning but notes uncertain toxicity.