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Value-for-money

Silphium perfoliatum

Silphium perfoliatum
Cup Plant

27 reviews
4,5/5
21 reviews
3 reviews
0 reviews
1 reviews
2 reviews

The plant has taken well, didn't grow very tall during the summer but has bloomed nicely.

Julie, 04/01/2024

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This plant carries a 12 months recovery warranty

More information

Graden Merit
Silphium perfoliatum is a very large, sun-loving perennial with yellow flower heads, from the same family as sunflowers, but perennial!
Flower size
7 cm
Height at maturity
2 m
Spread at maturity
50 cm
Exposure
Sun
Hardiness
Hardy down to -29°C
Soil moisture
Moist soil, Damp soil
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Recommended planting time February to April, September to November
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Flowering time July to September
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Description

Silphium perfoliatum is a very tall perennial with yellow head flowers, from the same family as sunflowers, but perennial!

 

This very tall perennial is native to the plains of central-eastern North America and has a robust crown which large, quadrangular, straight stems emerge from in spring, over 2 metres (7 feet) tall but unaffected by wind.

The matte green, lanceolate leaves can grow to measure over 50cm (20in) long in deep and moist soil. These leaves are sheathing the base of the stems and often retain rainwater which is why the plant is nicknamed "bird bath".

The flowers look like large golden yellow daisies, 7cm (3in) in diameter and bloom in summer at the ends of the branched stems.

 

This is the perfect plant to accompany tall grasses such as Miscanthus or Cortaderia in an open and sunny garden.

Silphium perfoliatum in pictures

Silphium perfoliatum (Foliage) Foliage

Flowering

Flower colour yellow
Flowering time July to September
Flower size 7 cm

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 2 m
Spread at maturity 50 cm
Growth rate normal

Botanical data

Genus

Silphium

Species

perfoliatum

Family

Asteraceae

Other common names

Cup Plant

Origin

Cultivar or hybrid

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Planting and care

Grow Silphium perfoliatum in moist, rich, deep, heavy or light soil without excess moisture in winter.

Planting period

Recommended planting time February to April, September to November

Intended location

Suitable for Meadow
Type of use Back of border
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Neutral, Calcareous
Soil type Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
Soil moisture Moist soil, Damp soil, rich, well-drained and deep

Care

Pruning instructions Prune the dry stems in late winter.
Pruning Pruning recommended once a year
Pruning time March to April
Overwinter Can be left in the ground
4,5/5

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