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Calylophus serrulatus Superlophus Yellow - Yellow Sundrops

Calylophus serrulatus Superlophus Yellow
Yellow Sundrops, Serrate Evening Primrose

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More information

A perennial shrubby plant closely related to evening primroses that forms a low, bushy clump with fine green, toothed leaves. It offers a very long summer flowering period composed of large lemon yellow cups that open during the day and close in the evening. A plant for full sun and well-drained, rather poor soils, resistant to drought, very hardy in dry soil. It is a lovely plant for rockeries, borders, and containers.
Flower size
3 cm
Height at maturity
35 cm
Spread at maturity
35 cm
Exposure
Sun
Hardiness
Hardy down to -15°C
Soil moisture
Dry soil
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Best planting time March to April
Recommended planting time February to April, September to October
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Flowering time June to September
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Description

Calylophus serrulatus 'Superlophus Yellow' (synonym Oenothera serrulata 'Superlophus Yellow') is a remarkably floriferous perennial bush that blooms in summer, with large lemon yellow flowers that open during the day, unlike those of its close relative, the evening primrose. It forms a slightly loose, low bushy clump, with slender, long, bright green leaves. It is a plant that thrives in full sun and well-drained, even dry soil. Perfectly suited for rock gardens, borders, and waterless flower beds, it is also welcomed in containers to liven up the terrace or balcony throughout the summer.

Oenothera serrulata 'Superlophus Yellow' is a selection by Voltz known for its wider flowers compared to the species. The wild species is native to dry meadows and mesas in western North America, particularly the Great Plains from Canada to Texas. In well-drained, dry (rocky) soil, its roots can withstand temperatures as low as -15°C. It belongs to the Onagraceae family. The 'Superlophus Yellow' variety is a woody-based perennial with a taproot that can reach deep for moisture. The root does not like to be disturbed. The plant forms a low, slightly loose clump, with few branches, measuring between 25 and 45cm in height. It has narrow, lance-shaped leaves with distinct toothed edges, a fairly light green color, and can reach up to 5-6cm in length. This deciduous foliage dries up in autumn. The flowering period extends from June-July to September, even in dry soil. The cup-shaped flowers have 4 lemon yellow petals, measuring 3 to 4cm in diameter, and bloom during the day. This flowering attracts bees and butterflies. The flowers give way to 2cm long seed capsules.

This Calylophus 'Superlophus Yellow' is a plant that thrives in full sun and well-drained, even dry soil. It will be the perfect companion for rock gardens, slopes, and border plantings, especially in Mediterranean regions. When grown in pots or containers on a terrace or balcony, it will require more regular watering. Pairing it with blue-flowering shrubby salvias will create a beautiful effect. It will also be a great companion for lavenders and Echinops or globe thistles. It can also be planted in front of shrubs such as Perovskia, Teucrium 'Azureum', and Caryopteris.

 

Flowering

Flower colour yellow
Flowering time June to September
Inflorescence Cluster
Flower size 3 cm
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Deciduous
Foliage colour green

Plant habit

Height at maturity 35 cm
Spread at maturity 35 cm
Growth rate fast

Botanical data

Genus

Calylophus

Species

serrulatus

Cultivar

Superlophus Yellow

Family

Onagraceae

Other common names

Yellow Sundrops, Serrate Evening Primrose

Botanical synonyms

Calylophus serrulatus 'Superlophus Yellow'

Origin

North America

Product reference21368

Other Oenothera - Evening Primrose

12
From €4.90 8/9 cm pot
20
From €6.90 8/9 cm pot
28
From €4.90 8/9 cm pot
9
From €4.90 8/9 cm pot
11
From €4.90 8/9 cm pot
32
From €6.90 8/9 cm pot
55
From €2.90 7/8 cm pot
Available to order
From €4.90 7/8 cm pot
19
From €4.90 8/9 cm pot

Available in 2 sizes

37
From €6.90 8/9 cm pot

Planting and care

Plant Calylophus 'Superlophus Yellow' in spring in full sun, at a rate of 9 plants per square metre to obtain ground cover, or with a spacing of at least 30cm in a flower bed. This plant is highly resistant to heat. Choose its location carefully to avoid disturbing its taproot during transplantation. It can be grown in all types of well-drained soils, even rocky ones, preferably dry, and requires very little maintenance: water during planting and the first year, until the plant is properly rooted. Once it is well established, stop watering. Removing faded flowers is not necessary. However, it is very useful to prune the clump in spring to encourage branching and maintain a compact habit.

17
€14.50 Each
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€19.50

Planting period

Best planting time March to April
Recommended planting time February to April, September to October

Intended location

Suitable for Meadow, Rockery
Type of use Border, Edge of border, Container, Slope
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Any
Soil type Chalky (poor, alkaline and well-drained), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Dry soil, Very well-drained, gravelly, rocky

Care

Pruning instructions Prune the clump in spring to encourage it to branch out and maintain a compact habit.
Pruning Pruning recommended once a year
Pruning time March
Disease resistance Good
Overwinter Can be left in the ground

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