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Silphium trifoliatum (Whorled rosinweed)
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1 hour care
per year
per year
2m
Max height
Max height
1m
Max spread
Max spread
2-5 years
To maturity
To maturity
Plant details
Botanical name
Silphium trifoliatum
Other names
Whorled rosinweed, Silphium asteriscus var. trifoliatum, Three-leaved rosinweed
Genus
Silphium Silphium
Species
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
Habit
Clump-forming, Erect
Flower
Yellow in Summer; Yellow in Autumn
Foliage
Mid-green in Spring; Mid-green in Summer; Mid-green in Autumn
How to care
Watch out for
Pests
Generally pest free.
Diseases
Generally disease free.
General care
Pruning
Cut back after flowering. Alternatively, cut back in early spring before new growth emerges. May need staking in windy sites.
Propagation methods
Division, Seed
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Where to grow
Silphium trifoliatum (Whorled rosinweed) will reach a height of 2m and a spread of 1m after 2-5 years.
Suggested uses
Woodland, Wildlife, Wildflower, Cottage/Informal, Beds and borders, Architectural
Cultivation
Grow in moist, deep, moderately fertile, neutral to alkaline soil in sun or partial shade. Performs best in heavy clay.
Soil type
Chalky, Clay, Loamy, Sandy (will tolerate most soil types)
Soil drainage
Moist but well-drained, Well-drained
Soil pH
Alkaline, Neutral
Light
Partial Shade, Full Sun
Aspect
South, East, West
Exposure
Exposed, Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
Companion plants
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.
Botanical name
Silphium trifoliatum
Other names
Whorled rosinweed, Silphium asteriscus var. trifoliatum, Three-leaved rosinweed
Genus
Silphium Silphium
Species
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.
Foliage
Deciduous
Habit
Clump-forming, Erect
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Colour
Flower
Yellow in Summer; Yellow in Autumn
Foliage
Mid-green in Spring; Mid-green in Summer; Mid-green in Autumn
How to care
Watch out for
Pests
Generally pest free.
Diseases
Generally disease free.
General care
Pruning
Cut back after flowering. Alternatively, cut back in early spring before new growth emerges. May need staking in windy sites.
Propagation methods
Division, Seed
Monthly care advice
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Where to grow
Silphium trifoliatum (Whorled rosinweed) will reach a height of 2m and a spread of 1m after 2-5 years.
Suggested uses
Woodland, Wildlife, Wildflower, Cottage/Informal, Beds and borders, Architectural
Cultivation
Grow in moist, deep, moderately fertile, neutral to alkaline soil in sun or partial shade. Performs best in heavy clay.
Soil type
Chalky, Clay, Loamy, Sandy (will tolerate most soil types)
Soil drainage
Moist but well-drained, Well-drained
Soil pH
Alkaline, Neutral
Light
Partial Shade, Full Sun
Aspect
South, East, West
Exposure
Exposed, Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
USDA zones
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... |
COMPANION PLANTS
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.
GARDENS WITH THIS PLANT
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