Lobelia siphilitica
Blooming Time
Exposure
Great blue lobelia has outstanding ornamental appeal with giant clusters of light to dark blue flowers, densely borne and great for attracting pollinators like bees, hummingbirds, and butterflies. It is tolerant of soils with high moisture content, making it well suited for lowland areas, alongside ponds or streams, or in rain gardens.
Details
Hardiness Zone:
Blossom Color:
Blue to Blue Gray
Growth Habit:
Clump Forming
Max Height:
3'
Texture:
Recommended Spacing:
We sell this plant in these containers:
Special Characteristics
Features
Has outstanding appeal with giant clusters of light to dark blue flowers, densely borne and great for attracting pollinators.
Landscape Value
Tolerant of soils with high moisture content, making it well suited for lowland areas, alongside ponds or streams, and in rain gardens.
Care
Watering:
Great Blue Lobelia requires a fair amount of supplemental watering and often requires watering on a regular basis during the growing season.
Fertilizing:
Great Blue Lobelia is a moderate feeder, benefiting from a couple of annual applications of slow release fertilizer. A spring application of a 3-1-2 ratio (such as a 15-5-10) can be applied at a rate of about 10 pounds per 1000 square feet, and during early fall, an application of a 2-1-2 ratio (such as a 10-5-10) can be applied to encourage root development and cold hardiness.
Pruning:
Great Blue Lobelia should be enjoyed all winter long, then, during early April before it begins to grow again, it should be pruned or mowed back to ground level.