Lobelia siphilitica One of our most beautiful native wildflowers, the Great Blue Lobelia was an early export back to Europe by the first North American explorers and a popular garden flower since the 1600s. The Native Americans claimed many medicinal uses for this important native plant which also is stately and unusual in the garden or naturalized area. Excellent for bees and butterflies. 1-3 feet. Part to full sun. Seeds should be planted in warm conditions. Perennial. 100+ seeds.