Rosinweed (Silphium integrifolium) in the Silphiums Database

Common names:
Give a thumbs up Rosinweed
Give a thumbs up Wholeleaf Rosinweed
Give a thumbs up Whole-leaf Rosinweed
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General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Minimum cold hardiness: Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
Plant Height: 36 - 72 inches
Plant Spread: 12 - 36 inches
Fruit: Edible to birds
Fruiting Time: Fall
Flowers: Showy
Flower Color: Yellow
Bloom Size: 1"-2"
2"-3"
3"-4"
Flower Time: Summer
Late summer or early fall
Underground structures: Rhizome
Uses: Will Naturalize
Edible Parts: Fruit
Wildlife Attractant: Bees
Birds
Butterflies
Propagation: Seeds: Stratify seeds: Requires 2 months cold moist treatment.
Pollinators: Moths and Butterflies
Flies
Bumblebees
Bees
Containers: Not suitable for containers

#pollination

Photo gallery:

Comments:
Posted by Cyclaminist (Minneapolis, Minnesota - Zone 5a) on Apr 30, 2016 12:01 PM

A neater and shorter relative of cup plant (Silphium perfoliatum). It spreads by short rhizomes to form clumps, and is more manageable than most perennial sunflowers, which spread by longer rhizomes. Probably the best Silphium species for small gardens (the other species are taller or have very large basal leaves), and a good replacement for perennial sunflowers. Drought-tolerant because of its deep fleshy roots. It matures and reaches flowering size faster from seed than prairie dock (Silphium terebinthinaceum) and compass plant (Silphium laciniatum).

As with all Silphium species, the flowers provide food to longer-tongued bees, which can reach the nectar, and occasionally to butterflies. The seeds are large, flat, and lightweight, and are sometimes eaten by goldfinches.

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Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Feb 18, 2018 5:36 PM

This is a common forb of the prairie and Great Plains from Ohio to the Dakotas down to northern Texas to Mississippi. When in bloom it bears a fragrant resin that was used as gum by Native Americans. It rarely flops over as a tall perennial. Its flowers are the opposite of Sunflowers in that the disc flowers in the middle are sterile, while the ray flowers on the outside are fertile. It is sold by a good number of native plant nurseries in the Midwest for prairie restoration and naturalistic native plant gardens and landscapes.

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Discussion Threads about this plant
Thread Title Last Reply Replies
I thought I knew its name but now I'm not sure by wildflowers Jun 17, 2012 7:34 AM 15

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