Lobelia siphilitica Seeds (Great Lobelia)

Great Lobelia, scientifically known as Lobelia siphilitica, is a native perennial plant found in North America. It features beautiful, vibrant blue flowers on tall spikes, resembling an inverted cone. Commonly referred to as Blue Cardinal Flower or Blue Lobelia, this plant grows in moist areas such as marshes, stream banks, and wet meadows. It reaches a height of 2-3 feet and blooms from late summer to early fall. Great Lobelia is hardy in USDA zones 4-9 and can be grown from Lobelia siphilitica seeds, attracting butterflies and hummingbirds with its nectar-rich blossoms.

Growing Lobelia siphilitica from Seed

• Growth cycle: Perennial
• Watering: Medium
• Sunlight: Medium Sun
• Suitable climates: Humid Continental, Marine West Coast, Mediterranean
• Where to grow: Outdoors
• Flower color: Blue

Germinating Great Lobelia Flower Seeds

To germinate Lobelia siphilitica, stratify the seeds by placing them in a moist paper towel in the refrigerator for 4-6 weeks. Then, sow the seeds on top of moist soil and cover lightly. Keep the soil consistently moist until germination occurs.

We source all of our Lobelia siphilitica seeds from a small greenhouse facility based in southeastern Maine and store them in a dark, temperature-controlled environment before shipment. You’ll find that our fresh Great Lobelia seeds are much easier to germinate than the mass-produced packets of flower seeds found in stores! If you have any trouble growing Great Lobelia seeds, we’re happy to send you additional gardening tips. In the (unlikely) event that your Lobelia siphilitica seeds do not germinate at all, we’ll give you a full refund, no questions asked.

We offer this variety on Etsy, eBay, and Amazon, as well!

Shipping & returns

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