White Turtlehead (Chelone glabra): A Native Perennial for Wet Sites and Moon Gardens

While pink turtlehead (Chelone obliqua) and 'Hot Lips' get the spotlight, white turtlehead (Chelone glabra) is a taller, later-blooming, white-flowered native (zones 3–8) that thrives in wet soils — perfect for rain gardens, swales, and moon gardens. Native from Minnesota to Alabama (except Florida), it brings cool white blooms during the awkward late-summer-to-fall transition.

Why White Turtlehead Deserves Attention

Hardy to -40°F, this 2–4 ft tall, 1–2 ft wide perennial tolerates wet, boggy, and even clay soils. Its small footprint lets it tuck into established beds, slowly spreading by rhizomes into upright clumps. Blooms late summer to early fall — each flower lasts 1–2 days, but new ones open daily for 1–2 weeks. White flowers glow at dusk, ideal for evening gardens.

Michael Wolf

At a Glance

• Botanical name: Chelone glabra
• Common names: White turtlehead, turtlehead
• Native range: MN south to AL, all points east except FL
• Hardiness: USDA zones 3–8 (-40°F)
• Mature size: 2–4 ft tall, 1–2 ft wide
• Light: Full sun to partial shade
• Soil: Wet to moist; tolerates clay
• Bloom: Late summer to early fall

Pollinator & Wildlife Value

Native bumblebees are primary pollinators (strong enough to pry open the "turtle head" flowers). It's also a larval host for the rare Baltimore checkerspot butterfly (Euphydryas phaeton), Maryland's state insect.

Jim Kingdon

Aaron Carlson

Design Uses

• Rain gardens & swales: Thrives in wet conditions.
• Moon/evening gardens: White blooms reflect twilight.
• Border tuck-ins: Narrow footprint fits tight spaces.
• Naturalistic wetlands: With cardinal flower, swamp milkweed, ferns, sedges.

Planting & Culture

Prefers rich, moist soil (natural habitats: bogs, streambanks, open woodlands, low meadows). Remarkably tolerates clay. Flowers more in sun but needs consistent moisture there; in shade may lean and need support. To avoid staking, cut back by half in May for bushier habit. Plant spring to fall (potted/bare-root); seed in fall/winter.

Bottom line: For wet spots where little else thrives, white turtlehead offers late-season bloom, pollinator drama, and a rare butterfly host — all in a tidy, native package.