Mad-dog Scullcap is a native North American wetland herb that thrives where most garden plants struggle. This low-growing perennial in the mint family reaches 2 to 3 feet tall and spreads steadily through rhizomes and runners, creating naturalized drifts in moist soils. Hardy from zones 3 to 9, it produces showy blue flowers from July through October and tolerates wet conditions, deer, and rabbits with equal grace. The plant needs no fussing once established, asking only for moderate water and sun to partial shade.
Partial Sun
Moderate
3-9
36in H x 30in W
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Moderate
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Blue Scullcap grows robustly in the wet soils and boggy edges where conventional garden plants fail, spreading naturally through rhizomes to fill wetland gardens and rain gardens. Its native range spans from Quebec to British Columbia, a testament to its adaptability across climates and seasons. The showy blue flowers bloom reliably from midsummer into fall, and deer and rabbits leave it untouched. Low maintenance and genuinely tough, it handles aphids and minor fungal issues without demanding intervention.
Mad-dog Scullcap is grown primarily as a naturalized wetland plant, used to stabilize moist and seasonally wet areas where conventional perennials struggle. Its rhizomatous spread makes it valuable for rain gardens, pond margins, and areas prone to occasional flooding.
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“Scutellaria lateriflora is native to wetland areas across North America, its range stretching from Quebec and Newfoundland west to British Columbia and south to California, Louisiana, and Florida. Indigenous peoples and early settlers valued it for its traditional uses, though it remained largely a regional plant until modern herbalists and gardeners rediscovered its utility. Missouri botanical records document it thriving in low wet woods, swampy meadows, alluvial thickets, gravel bars, and river flood plain forests across the continent, suggesting a plant perfectly adapted to the marginal spaces where water lingers.”