Euphorbia Ascot Rainbow
Euphorbia ‘Ascot Rainbow’ is a striking evergreen perennial prized for its colourful variegated foliage, compact growth habit and exceptional tolerance to heat and dry conditions. Featuring beautiful blue-green leaves edged in creamy yellow, this ornamental plant develops vibrant pink, red and rosy tones during the cooler months, providing spectacular colour throughout the year.
From late winter through spring, attractive clusters of lime-green, cream and yellow-green flower bracts emerge above the foliage, creating a colourful display that complements its distinctive leaves.
Growing to approximately 50 cm high and wide, Euphorbia ‘Ascot Rainbow’ forms a dense, rounded mound that requires very little maintenance. Its compact size and colourful foliage make it an excellent choice for garden borders, mass planting, rockeries, decorative pots and contemporary landscaping.
Well suited to sunny, well-drained positions, this hardy Euphorbia is particularly useful in water-wise, coastal and Mediterranean-style gardens. For Sunshine Coast gardens, excellent drainage is essential, particularly during periods of heavy summer rainfall.
Flowers
Produces attractive upright clusters of small flowers surrounded by colourful lime-green, cream and yellow-green bracts, often featuring contrasting reddish centres.
Flowering generally occurs from late winter through spring, creating an attractive display above the variegated foliage.
The colourful flower bracts provide long-lasting ornamental interest and complement the plant's naturally rounded shape.
Foliage
The foliage is the standout feature of Euphorbia ‘Ascot Rainbow’, providing beautiful colour throughout the year.
Narrow, blue-green leaves feature distinctive creamy-yellow margins, creating an attractive variegated appearance.
During autumn and winter, cooler temperatures encourage shades of pink, rose and red to develop along the leaf edges and growing tips.
The combination of cream, green, blue and seasonal pink-red tones creates a colourful display even when the plant is not flowering.
Fruit
Small seed capsules may develop following flowering, although these are generally inconspicuous.
Euphorbia ‘Ascot Rainbow’ is primarily grown for its colourful foliage, decorative flower bracts and compact growth habit rather than its fruit.
Form & Size
Height: Approximately 0.5 m
Width: Approximately 0.5 m
Growth Habit: Compact, dense, naturally rounded evergreen perennial.
Growth Rate: Moderate, developing a bushy, mounded appearance.
Its naturally compact form makes it particularly suitable for smaller gardens, decorative containers and low-maintenance landscape planting.
Growing Conditions
Sunlight: Full sun to partial shade. Best foliage colour and compact growth generally occur in full sun. In hot subtropical locations, some afternoon shade may be beneficial.
Soil: Prefers well-drained sandy, loamy or gravelly soils. Excellent drainage is essential, as Euphorbias do not tolerate prolonged waterlogging.
Watering: Water regularly during establishment, allowing the soil to drain between watering. Once established, highly drought tolerant and generally requires only occasional deep watering during extended dry periods.
Frost Tolerance: Excellent frost tolerance once established, with the foliage often developing stronger pink and red colouring during cooler weather.
Wind Tolerance: Good tolerance to general wind exposure and suitable for many coastal garden conditions.
Climate: Suitable for warm temperate, Mediterranean and subtropical gardens, including the Sunshine Coast where drainage is adequate.
Uses
Garden Borders: An excellent choice for adding colourful evergreen foliage along pathways, garden beds and landscaped borders.
Mass Planting: Plant in groups to create an attractive display of variegated foliage with seasonal pink and red highlights.
Decorative Pots: Its compact, rounded shape makes it ideal for feature pots, patio containers, courtyards and outdoor entertaining areas.
Mediterranean Gardens: Combines beautifully with gravel, natural stone, terracotta pots and other drought-tolerant plants.
Coastal Gardens: Suitable for sunny coastal landscapes where hardy, low-water plants are preferred.
Water-Wise Gardens: An excellent choice for gardens designed to reduce watering requirements once plants are established.
Rockeries & Gravel Gardens: The colourful foliage contrasts beautifully against decorative gravel, rocks and stone edging.
Contemporary Landscaping: Provides year-round colour and texture in modern gardens, structured planting arrangements and architectural landscapes.
Small Gardens: Its compact size makes it particularly useful for smaller garden beds and limited planting spaces.
Maintenance
Euphorbia ‘Ascot Rainbow’ is a particularly low-maintenance plant when grown in a sunny position with excellent drainage.
Water regularly during establishment, then reduce watering as the plant becomes established. Avoid overwatering, especially during periods of high rainfall.
Apply a light application of balanced slow-release fertiliser during spring to encourage healthy growth.
Remove spent flowering stems by cutting them back near the base to encourage fresh growth and maintain a compact appearance.
Regular shaping or heavy pruning is generally unnecessary.
Mulch lightly around the plant to suppress weeds, keeping mulch clear of the stems and crown to minimise excess moisture.
Important: Like other Euphorbias, ‘Ascot Rainbow’ produces a milky sap that can irritate the skin and eyes. Wear gloves and eye protection when pruning or handling damaged stems. The plant is harmful if eaten and should be kept away from children and pets.
Notes
Euphorbia ‘Ascot Rainbow’ is an Australian-selected cultivar developed by plantsman David Glenn and is internationally recognised for its colourful foliage, hardiness and ornamental appeal.
It has received the prestigious Royal Horticultural Society Award of Garden Merit for its outstanding garden performance.
For Sunshine Coast gardens, plant in a raised garden bed, well-drained soil or suitable container where necessary to prevent prolonged wet conditions during humid summer weather.
For mass planting, space plants approximately 40–50 cm apart to create an attractive, continuous display as they mature.
‘Ascot Rainbow’ is protected by Plant Breeder's Rights (PBR). Unauthorised commercial propagation is prohibited.
Companion Plants
Euphorbia ‘Silver Swan’ – Attractive silver-green and cream variegated foliage that complements the colourful tones of ‘Ascot Rainbow’.
Euphorbia ‘Ruby Glow’ – Rich burgundy-purple foliage providing a striking colour contrast.
Westringia ‘Blue Gem’ – Hardy evergreen shrub with attractive blue-purple flowers, suitable for sunny, well-drained gardens.
Lomandra ‘Lime Tuff’ – Fine lime-green foliage providing contrasting texture and colour.
Dianella ‘Little Rev’ – Upright blue-green foliage that complements the rounded form of the Euphorbia.
Rosemary ‘Tuscan Blue’ – Aromatic foliage and blue flowers, ideal for Mediterranean-style gardens.
Grevillea ‘Winter Delight’ – Low-growing native shrub with colourful flowers, suitable for sunny, well-drained planting areas.
Common Name: Ascot Rainbow Euphorbia, Variegated Spurge, Martin's Spurge
Botanical Name: Euphorbia × martinii ‘Ascot Rainbow’ PBR
Family: Euphorbiaceae
Origin: Australian-selected cultivar developed by David Glenn, Victoria, Australia.
