Lobelia siphilitica - Great Blue Lobelia

Great Blue Lobelia, the blue counterpart of the Cardinal Flower, prefers moist soils and can be found naturally in open, moist shaded woodlands and alongside lakes and streams. Longer lived than the Cardinal Flower it blooms in the late summer producing spikes of deep blue flowers and attracting Hummingbirds. Excellent for damp clay soils, Lobelia siphilitica is a great addition to any garden!


  Mid-Summer to Fall
  Full Sun to Part Shade
  1' - 3'
  Sand to Clay
  Medium to Moist


Approx. 300 seeds per pack - 17,108 seeds per gram

Attracts Butterflies, Honeybees & Hummingbirds!
Deer Resistant!
Makes Great Cutflowers!


All Wildflower Farm seeds are hardy through growing zone 3, organic and non-GMO.


Indoors: Cold, moist stratification. Start at least 5 weeks before outdoor night temperatures are reliably in the 10 C (50 F) range. Place seed on the surface of a slightly moistened, sterile, soil-less growing mix. Put this in a labelled, sealed plastic bag and store in a refrigerator for one day. The next day place this in the freezer for one day. Repeat this for one week, alternating between the fridge and the freezer. After stratifying, place mixture on the surface of pots filled with growing media. Seed needs light to germinate, do not cover after planting. Keep moist but not soggy and very warm (21 C - 70 F). When seedlings are 5 cm (2 inches) tall or more, transplant into the garden spaced 30 cm (1 foot) apart.

Outdoors: Place seed on the surface of a prepared seed bed in late fall so that the seed overwinters and germinates naturally in spring.

Outdoors Alternative: In late fall through to mid-winter fill plastic pots with a slightly moistened, sterile, soil-less growing mix. Place seed on the surface of the growing mix and label the pots. Place the pots outdoors in an area where they will experience the snow and cold of winter. The seed will germinate in the pots in spring as the weather warms up. Be sure to water the pots regularly in spring and once the plants are 5 cm (2 inches) tall, transplant them into your garden.

Lobelia siphilitica - Great Blue Lobelia

  • Product Code: C15660
  • Availability: In Stock
  • $7.95