Prairie Dock (Silphium terebinthinaceum var. terebinthinaceum) in the Silphiums Database

General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: Wet Mesic
Dry Mesic
Minimum cold hardiness: Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
Maximum recommended zone: Zone 9b
Plant Height: 36 - 144 inches
Plant Spread: 24 - 48 inches
Leaves: Other: Huge
Fruit: Edible to birds
Flowers: Showy
Flower Color: Yellow
Bloom Size: 1"-2"
Flower Time: Summer
Late summer or early fall
Underground structures: Taproot
Uses: Will Naturalize
Edible Parts: Fruit
Wildlife Attractant: Bees
Resistances: Rabbit Resistant
Propagation: Seeds: Stratify seeds: 2 months cold moist treatment
Suitable for wintersowing
Pollinators: Bees
Containers: Not suitable for containers


Photo gallery:

Posted by Cyclaminist (Minneapolis, Minnesota - Zone 5a) on Aug 16, 2016 1:08 AM

Huge sandpapery leaves, very tall smooth flower stems. I have this growing in back of the garage, and it's blooming for the first time.

The other variety of the species, Tansy Dock (Silphium terebinthinaceum var. pinnatifidum) , apparently has leaves with lobed edges, perhaps reminiscent of Compass Plant (Silphium laciniatum) .

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