Great Blue Lobelia is a native North American wildflower that transforms summer gardens with tall spires of vivid purple blooms rising 30 inches above ferny foliage. Hardy in zones 4 through 4, this cultivar is a local Hudson Valley ecotype selected specifically for its vigor and pollinator magnetism, blooming reliably from June through August with flowers that nectar-hungry native bumblebees cannot resist. The plant thrives in moderate moisture and full sun conditions, reaching maturity in about 160 days and bringing a meadow-like elegance to gardens, borders, and partially shaded woodland edges.
1
Full Sun
Moderate
4-4
30in H x 18in W
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Moderate
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Native bumblebees, including species whose populations are threatened or in decline, seek out Great Blue Lobelia's nectar-rich purple spires throughout the summer and into fall. Deer leave it untouched, and the plant handles both full sun and dappled shade, adapting gracefully to the complicated light conditions around homes and under tree canopies. Hardy to zone 4, it's a long-blooming perennial that rewards patient gardeners with years of color once established in moist (but not waterlogged) soil.
Great Blue Lobelia is grown as an ornamental flowering plant, valued for its stunning purple spires that bring vertical interest and long-season color to gardens, native plant landscapes, and pollinator gardens. Its primary purpose is to attract and support native bumblebees and other pollinating insects, making it essential for gardeners committed to rebuilding declining pollinator populations in their region.
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In late winter, 10 to 12 weeks before your last frost date, sow seeds on the surface of sterile seed-starting mix and press them in gently. Cover lightly with a thin sprinkling of vermiculite to retain humidity until germination occurs. Keep soil consistently moist and maintain temperatures around 70°F. Optionally, you can improve germination by cold-stratifying seeds first: sow in pots, cover with plastic, refrigerate at 36 to 40°F for 3 to 4 weeks, then bring into warmth. Germination typically occurs 14 to 30 days after the chill period ends.
Harden off seedlings by gradually exposing them to outdoor conditions over 7 to 10 days before transplanting after your last frost date. Plant in moist soil in full sun to partial shade, spacing plants 18 inches apart. Ensure soil drains well but retains consistent moisture; Great Blue Lobelia thrives in moist (but not sodden) conditions.
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“Great Blue Lobelia is native to eastern North America, where it has long thrived in wetlands, along stream banks, and in moist meadows. This particular seed lot represents a local Hudson Valley ecotype, meaning it was collected from wild populations growing in that specific region and selected for its performance in that climate and soil. By offering seeds from this locally adapted strain rather than generic seed stock, growers preserve both the genetic distinctiveness of Hudson Valley populations and support the native plants and pollinators that depend on them.”