Silphium integrifolium (Rosin Weed)
Before flowering, Rosin Weed can be mistaken for Milkweed. While flowering, it resembles a Sunflower.  It blooms earlier than most Sunflowers, though, and is not as aggressive. The deep taproot on mature plants is very drought-tolerant and small rhizomes extending from this taproot allow it to form small colonies, albeit slowly.  It may be the best Silphium choice for a garden setting due to its shorter stature, ability to mature faster, and tough stem that keeps it upright with little to no surrounding plant support.

Seeds / Packet
: 75
Seeds / Ounce: 1,200

Dormant bare root plants ship each year during optimal transplanting seasons: Spring (April - May) and Fall (October).
Details
Range Map
Catalog Number SIL52F
Scientific Name Silphium integrifolium
Common Name Rosin Weed
Germination Code C(60)
Seeds / Packet 75
Seeds / Ounce 1,200
Wetland Code UPL
Sun Exposure Prairie
Soil Moisture Wet Mesic , Mesic , Dry Mesic , Dry
Height 5 feet
Bloom Color Yellow
Bloom Time July , August , September
Plant Type Forbs (Wildflowers)
Availability Seeds , Bare Root Plants
Price:
Seeds
Quantity: Pricing: Order:
Packet $2.00
1/4 oz. $3.00
1/2 oz. $3.90
1 oz. $6.00
1 lb. $90.00
Bare Root Plants
Quantity: Pricing: # of Plants:
Out of stock
 
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Detailed images

Silphium-integrifolium-Rosin-Weed-flower Silphium-integrifolium-Rosin-Weed-flowers Silphium_integrifolium_Rosin_Weed_seed Silphium-integrifolium-Rosin-weed-root
Silphium integrifolium (Rosin Weed)
Map Key
Present in state Present in county, native to state Present in county, not native to state  
Not present in state Present historically, now extirpated    
'FAQ' (Frequently Asked Questions) link

Companion Plants and Products

Silphium terebinthinaceum (Prairie Dock) See details
Silphium terebinthinaceum (Prairie Dock)
Seeds
Quantity: Pricing:
Packet $2.00
1/8 oz. $5.00
1/4 oz. $8.00
1/2 oz. $13.00
1 oz. $20.00
1 lb. $300.00
Bare Root Plants
Quantity: Pricing:
Out of stock
Potted Plants
Quantity: Pricing:
Out of stock
Prairie Dock is among the taller and larger-leaved prairie plants. It can mature to 9' in height with sandpaper-textured leaves 18" long and 12" wide.

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