Silphium trifoliatum
Whorled rosinweed, Silphium asteriscus var. trifoliatum, Three-leaved rosinweed
Silphium Silphium
S. trifoliatum - S. trifoliatum is an upright, clump-forming, herbaceous perennial with whorled, narrowly elliptic, rough, toothed, grey-green leaves and branched clusters of yellow flower heads from midsummer to early autumn.
Silphium trifoliatum is: Deciduous
Clump-forming, Erect
Yellow in Summer; Yellow in Autumn
Mid-green in Spring; Mid-green in Summer; Mid-green in Autumn
Generally pest free.
Generally disease free.
Cut back after flowering. Alternatively, cut back in early spring before new growth emerges. May need staking in windy sites.
Division, Seed
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Silphium trifoliatum (Whorled rosinweed) will reach a height of 2m and a spread of 1m after 2-5 years.
Woodland, Wildlife, Wildflower, Cottage/Informal, Beds and borders, Architectural
Grow in moist, deep, moderately fertile, neutral to alkaline soil in sun or partial shade. Performs best in heavy clay.
Chalky, Clay, Loamy, Sandy (will tolerate most soil types)
Moist but well-drained, Well-drained
Alkaline, Neutral
Partial Shade, Full Sun
South, East, West
Exposed, Sheltered
Hardy (H4)
This plant can hold its own against big bold plants such as hostas and acanthus.
We do not currently have companion plants added for this plant.
Silphium trifoliatum
Whorled rosinweed, Silphium asteriscus var. trifoliatum, Three-leaved rosinweed
Silphium Silphium
S. trifoliatum - S. trifoliatum is an upright, clump-forming, herbaceous perennial with whorled, narrowly elliptic, rough, toothed, grey-green leaves and branched clusters of yellow flower heads from midsummer to early autumn.
Deciduous
Clump-forming, Erect
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Yellow in Summer; Yellow in Autumn
Mid-green in Spring; Mid-green in Summer; Mid-green in Autumn
Generally pest free.
Generally disease free.
Cut back after flowering. Alternatively, cut back in early spring before new growth emerges. May need staking in windy sites.
Division, Seed
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Silphium trifoliatum (Whorled rosinweed) will reach a height of 2m and a spread of 1m after 2-5 years.
Woodland, Wildlife, Wildflower, Cottage/Informal, Beds and borders, Architectural
Grow in moist, deep, moderately fertile, neutral to alkaline soil in sun or partial shade. Performs best in heavy clay.
Chalky, Clay, Loamy, Sandy (will tolerate most soil types)
Moist but well-drained, Well-drained
Alkaline, Neutral
Partial Shade, Full Sun
South, East, West
Exposed, Sheltered
Hardy (H4)
Zone 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4, Zone 3
In order to add a note on this plant, please add this plant to your plant lists.
This plant likes... | Garden match | |
Soil types: | Chalky, Clay, Loamy, Sandy (will tolerate most soil types) | Tell us... |
Soil drainage: | Moist but well-drained, Well-drained | Tell us... |
Soil pH: | Alkaline, Neutral | Tell us... |
Light: | Partial Shade, Full Sun | Tell us... |
Aspect: | South, East, West | Tell us... |
Exposure: | Exposed, Sheltered | Tell us... |
Hardiness: | Hardy (H4) | Tell us... |
This plant can hold its own against big bold plants such as hostas and acanthus.
We do not currently have companion plants added for this plant.
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