Rosinweed Seed (Silphium integrifolium) 50 Seeds

  • $ 3.85


Shortest of the magnificent Silphium genus, Rosinweed displays its bright yellow flowers on two to six foot tall stems in late summer. Grows easily from seed, and is at home on a wide variety of soils, from moderately dry to moist. They have a taproot and do not transplant well. Excellent for tough clay soils. Birds love the seeds.

Silphium is a standout plant for many reasons. It blooms in sun and shade. There are many flowers on each plant.  As a bonus, the large sunflower-like flowers attract butterflies, hummingbirds, yellow finches, bees and all kinds of interesting insects. If that is not enough, Silphium integrifolium is drought tolerant.

This plant is under study/development for an oilseed crop.  As a perennial it may be a huge upcoming carbon-farming star.  

Edible seeds. Split or broken stems exude a gummy, fragrant-but-bitter resin which was used by Native Americans as a mouth-cleansing chewing gum.  Add your own mint flavor. 

Medicinally it is out of favor. Native Americans used the root to treat pain from injuries.  Other reported uses are numerous.  There is some documentation of ancient cultures valuing this plant above all others.  So much, in fact, they over harvested and it became rare. This is an interesting search  - you can start here to do your own sleuthing - DuckDuckGo Search - Silphium pain treatment

How to Grow:

Place seed in a damp coffee filter or paper towel.  Label a ziploc bag with the start date and end date 60 days after the start date.  Place in the refrigerator.  Plant seed in cell flats after cold treatment.  Plant out when seedlings are large enough to handle (>4 inches)  This cold treatment can be eliminated if seed is sown outdoors in the fall or winter.