Lobelia siphilitica
Great Blue Lobelia
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Great Blue Lobelia (Lobelia siphilitica) - Description
The Great Blue Lobelia (Lobelia siphilitica) is a species within the Campanulaceae family. It is an herbaceous, perennial dicot native to eastern and central Canada and United States. Growing up to three feet tall, it lives in zones 4 to 9 in moist to wet soils. It produces a spike of zygomorphic flowers in the late summer.
Great Blue Lobelia (Lobelia siphilitica) - Blooming
All have tubular flowers that are slit almost to the base to form two lips. The top lip has two lobes and the bottom one three. Flowers are single or in erect racemes or panicles in shades of blue to red to white to yellow. To enhance flowering, implement a balanced liquid fertilizer biweekly between spring and early summer. From there, apply a nitrogen-free fertilizer biweekly til the end of the growing season.
Great Blue Lobelia (Lobelia siphilitica) - Growth
Diverse genus of annuals and perennials, and shrubs, treelike plants, and aquatic species. The tallest can reach 30 feet. The most common are 2-4 feet. All have simple leaves. The plants are short-lived, but will self-sow in favorable sites. Grows best in full sun or partial shade.
Great Blue Lobelia (Lobelia siphilitica) - Planting
Sow seeds of annuals in late winter; sow perennials when seeds are ripe. Propagate aquatic species by division in summer. Divide border perennials in spring.
Great Blue Lobelia (Lobelia siphilitica) - Pest
Slugs. Lobelia is also prone to leaf spots, rust, and smut.
Great Blue Lobelia (Lobelia siphilitica) - Interesting facts
Lobelia produce milky sap which may aggravate the skin upon contact. Species are found in tropical and temperate regions across the globe.
Great Blue Lobelia (Lobelia siphilitica) - Soil and irrigation
Rich, constantly moist soil. Marshy spots or along streams or ponds work well. Aquatic species prefer acidic soil.
