North America Non-native Plant

Euphorbia Decaryi Var. Capsaintemariensis

Botanical name: Euphorbia decaryi var. capsaintemariensis

USDA symbol: EUDEC2

Native status: Not native but doesn't reproduce and persist in the wild

Synonyms: Euphorbia cap-saintemariensis Rauh (EUCA28)   

Euphorbia decaryi var. capsaintemariensis: A Rare Madagascan Gem for Succulent Enthusiasts If you’re a succulent collector with a taste for the unusual, Euphorbia decaryi var. capsaintemariensis might just be the conversation starter your garden needs. This lesser-known variety hails from the sun-baked landscapes of Madagascar, bringing a touch of exotic ...

Euphorbia decaryi var. capsaintemariensis: A Rare Madagascan Gem for Succulent Enthusiasts

If you’re a succulent collector with a taste for the unusual, Euphorbia decaryi var. capsaintemariensis might just be the conversation starter your garden needs. This lesser-known variety hails from the sun-baked landscapes of Madagascar, bringing a touch of exotic charm to specialized plant collections.

What Makes This Plant Special?

This particular euphorbia variety is native to the Cap Sainte Marie region of Madagascar, where it has adapted to some pretty harsh conditions. While it doesn’t have a widely recognized common name, it’s sometimes referred to by its synonym, Euphorbia cap-saintemariensis Rauh, in botanical circles.

As a member of the massive Euphorbia family, this plant shares the characteristic of producing a milky latex sap, so handle with care! It’s a compact succulent that forms an interesting architectural presence in the right setting.

Is This Plant Right for Your Garden?

Here’s the honest truth: Euphorbia decaryi var. capsaintemariensis isn’t for everyone. This plant is best suited for:

  • Serious succulent collectors looking for something unique
  • Rock gardens with excellent drainage
  • Container gardens that can be moved indoors during cold weather
  • Xerophytic landscape designs in warm climates

Since this plant is native to Madagascar rather than North America, consider exploring native succulents in your area first. Many regions have their own fascinating drought-tolerant plants that support local ecosystems while providing similar aesthetic appeal.

Growing Conditions and Care

If you decide to add this Madagascan native to your collection, here’s what it needs to thrive:

Climate Requirements

This plant is only hardy in USDA zones 9b-11, making it a greenhouse or indoor plant for most gardeners in cooler climates. It absolutely cannot tolerate frost, so plan accordingly.

Soil and Drainage

The golden rule with this euphorbia is drainage, drainage, drainage! Use a well-draining succulent mix or create your own with plenty of perlite, pumice, or coarse sand. Soggy soil is a death sentence for these plants.

Light and Watering

Provide full sun to partial shade, and water sparingly. Allow the soil to dry completely between waterings, and reduce watering significantly during cooler months when growth slows.

A Word of Caution

Like all euphorbias, this plant produces a milky sap that can be irritating to skin and eyes. Always wear gloves when handling, and keep away from children and pets. The sap is toxic if ingested.

The Bottom Line

Euphorbia decaryi var. capsaintemariensis is a specialized plant for dedicated collectors rather than casual gardeners. While it offers unique appeal for those interested in Madagascan flora, most gardeners would be better served exploring native succulent options that provide similar drought tolerance while supporting local wildlife.

If you do choose to grow this variety, source it responsibly from reputable nurseries, and be prepared to provide the specific care it requires. With proper attention to drainage and protection from cold, it can be a fascinating addition to a specialized succulent collection.

Euphorbia Decaryi Var. Capsaintemariensis

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Euphorbiales

Family

Euphorbiaceae Juss. - Spurge family

Genus

Euphorbia L. - spurge

Species

Euphorbia decaryi Guillaumin

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA