Great Blue Lobelia FLOWER Seeds - L. siphilitica - For wetland pond side, border - Zones 3 - 9 (002000 Seeds - 2000 Seeds - Pkt. Size) Great Blue Lobelia FLOWER Seeds L. siphilitica For wetland pond side, border Zones 3 - 9 Lobelia siphilitica - Great Blue Lobelia Seeds This blue counterpart of the Cardinal Flower (Lobelia cardinalis) is a most desirable plant for woodland gardens especially since it blooms bright blue in late summer. Origin: US Native Other Common Names: Duration: Perennial Bloom Time: Fall Height: 12 to 36 Spacing: 15 to 18 Light: Full Sun to Part Shade Soil Moisture: Wet to Medium USDA Zone: 3a-9b Germination: No pre-treatment needed. Sow seeds on soil surface at 70F and water. The color of this wildflower is truly intense! A deep and vivid blue, with dense spikes of large, mint shaped flowers, this plant is ideal for your wetland, pond side, border, meadow... almost anywhere that has good moisture! A VERY enjoyable beautiful flower!