Euphorbia (Euphorbia x martini 'Ascot Rainbow') in the Euphorbias Database

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Common names:
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General Plant Information (Edit)
Plant Habit: Herb/Forb
Sun Requirements: Full Sun
Minimum cold hardiness: Zone 6b -20.6 °C (-5 °F) to -17.8 °C (0 °F)
Plant Height: 2 to 3 feet
Plant Spread: 2 to 3 feet
Leaves: Good fall color
Unusual foliage color
Other: Pungent
Flowers: Showy
Other: In the genus Euphorbia, the flowers are reduced in size and aggregated into a cluster of flowers called a cyathium (plural cyathia). This feature is present in every species of the genus Euphorbia but nowhere else in the plant kingdom.
Flower Color: Green
Other: Variegated cream-yellow, lime, green, and red in color
Flower Time: Spring
Late spring or early summer
Suitable Locations: Xeriscapic
Uses: Provides winter interest
Dynamic Accumulator: B (Boron)
Toxicity: Leaves are poisonous
Roots are poisonous
Other: All members of the genus Euphorbia produce a milky sap called latex that is toxic and can range from a mild irritant to very poisonous.
Propagation: Other methods: Cuttings: Stem


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July 19, 2014

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Posted by valleylynn (Dallas, OR - Zone 8b) on Oct 18, 2012 9:10 AM

Euphorbia x martinii 'Ascot Rainbow' (Euphorbia characias x Euphorbia amygdaloides 'Rubra') was discovered by David Glenn in Australia.

I have found that even the hybrid euphorbias are good at keeping gophers and other plant/bulb-eating critters out of the garden beds. The euphorbia does need to be planted close to the plants/bulbs you want to protect.

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Posted by ssgardener (Silver Spring, MD - Zone 7a) on Mar 12, 2013 7:17 AM

This is a gorgeous euphorbia all season long. My favorite is the winter color, because it provides such wonderful color when everything else is brown or just plain green.

I've read that it needs to be cut back in early spring, but that may be for well established plants. It's listed as full sun, but I think it'll be fine in part sun, like other similar euphorbias. I don't know whether deeper shade will affect the variegation.

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Posted by SongofJoy (Clarksville, TN - Zone 6b) on Oct 24, 2011 12:47 PM

This is a colorful and compact spreading Euphorbia. Both the flowers and the foliage are variegated. The flowers are a combination of cream and lime green; the foliage is cream with blue-green and the reverse is a pink or red. In the cooler months the foliage flushes even more red. Tolerant of heat and drought.

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Posted by eclayne (Pioneer Valley south, MA, USA - Zone 6a) on Sep 6, 2012 10:01 AM

This hardy Euphorbia survived its first winter in great shape, but last winter was very mild, so I'm unsure of its continued hardiness here. I haven't watered or fertilized, and in full sun it's maintained a nice compact form with beautiful color. Last winter it was a nice dark red beacon although the form was open and unattractive up close. I pruned back to just a few inches in early spring and it apparently developed enough "old growth" because it bloomed very profusely. Update: Only about 1/4 of the plant put out new growth this year (2013).

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Posted by jvdubb (48036 MI - Zone 6b) on Aug 25, 2014 6:38 PM

I purchased two of these euphorbias in 2012. I was blown away by the way they looked the same that winter as they had in summer. I only cut back a few branches or part of branches late in spring 2013. They delighted me all through the growing season in 2013. Then came the winter. Deep snow and bitter cold temps. I lost both plants. I promptly bought two more in June 2014. I hope they survive this next winter, but if they don't, I will buy at least two more! Other than the problem with winter, these plants are drought tolerant and carefree in my zone 6 garden

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Posted by 4susiesjoy (Leonard, Minnesota - Zone 3b) on Aug 25, 2014 5:47 PM

This euphorbia has been thriving in a pot through a very cool summer. The colors in it have been very bright and colorful -- maybe deeper colors because of the cool, as some of the other Euphorbias do. Although its minimum hardiness is supposed to be zone 6, I will take cuttings, but I will also plant it to see whether it will survive the winter in zone 3 with heavy mulch.

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Posted by Deebie (midstate South Carolina - Zone 8a) on Aug 25, 2014 6:28 PM

I love this variegated plant for year-round color, especially during the dreary winter months. It looks good potted with white pansies and kale. I take cuttings during the warmer months to add plants to other planters and to share with friends, who always want a piece when they see it. Fortunately, they root very easily. Plants bloom in late summer and early fall, and the leaves turn a beautiful reddish color. I grow it in full sun.

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Posted by Frillylily (springfield MO area - Zone 6a) on Apr 19, 2017 10:47 AM

Died over the winter its second year and did not return. Returned strongly the winter before, so I am inclined to think this is a biannual and only lives 2 years. Does not like wet winter soil, needs well drained soil.

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