Silphium terebinthinaceum - Prairie Dock

The unique, almost tropical, foliage of the majestic Silphium terebinthinaceum makes a statement that is all its own. Producing huge rounded leaves that resemble elephant's ears, Prairie Dock creates masses of bright yellow flowers are atop its five to ten foot tall stalks. Very long living, it prefers rich clay soils with good moisture but also does well in fertile, well drained land. Prairie Dock attracts honeybees and bumblebees and Goldfinches love to eat the seeds!


  Mid to Late Summer
  Full Sun
  4' - 10'
  Sand to Clay
  Dry to Medium


Approx. 9 seeds per pack - 37 seeds per gram

Attracts Butterflies, Hummingbirds & Songbirds!
Deer Resistant!
Makes Great Cut Flowers!


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. Mix the seed with 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, plant seed 0.64 cm (1/4 inch) deep in pots. 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: Plant seed 0.64 cm (1/4 inch) deep in 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. Plant seed 0.64 cm (1/4 inch) deep in pots and label the pots. Place them 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.

Silphium terebinthinaceum - Prairie Dock

  • Product Code: C18680
  • Availability: In Stock
  • $6.95