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Lobelia siphilitica

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Photos credit J.C. Raulston Arboretum at NC State University

Great Blue Lobelia

This perennial Lobelia is similar to the red-flowered Lobelia cardinalis but the flowers are blue. These flowers are numerous, on tall spikes, and are about 1 inch long. The Big Blue Lobelia should be grown in moist soil in partial shade. Plants should be divided and moved every few years. Native to eastern U.S.

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2-3 Feet


4-8 Inches


USDA Hardiness Zone 4-8

Characteristics & Attributes

Sun Requirements
Part Shade