Euphorbia Milii

The Euphorbia Milii, better known as the “crown of thorns”, is a succulent plant particularly appreciated for its long-lasting flowering and its bushy silhouette covered with spines. Native to Madagascar, this euphorbia combines robustness, aesthetics and originality. Its upright or semi-trailing stems are covered with formidable grey to brown spines, while its small green leaves grow mainly at the tips of the stems. But what makes the Euphorbia Milii so popular are above all its bright flowers, technically called bracts, which surround tiny yellow cyathia. Pink, red, white, yellow or orange, they appear almost all year round under favorable conditions.

Highly appreciated indoors as well as outdoors (in warm regions), this plant charms with its ability to bloom abundantly even in a small pot. Of moderate growth, it is suitable for beginners, provided a few simple rules are respected. Its drought tolerance and long flowering make it an ideal decorative plant for balconies, windowsills or bright verandas.

In the wild, the Euphorbia Milii grows in the arid and semi-desert areas of Madagascar. There it forms thorny bushes that can reach 1 to 2 meters in height. Its cultivated form, now widely hybridized, is more compact and floriferous, with a wide palette of colors obtained through horticultural selection.

The Euphorbia Milii is a great lover of light, essential to stimulate its flowering:

🌞 Full sun: 5 to 6 hours per day minimum, ideally with southern or western exposure. The more light it receives, the more flowers it produces.

🌤️ Bright indirect light: tolerated, but flowering will be reduced.

Although it is fairly drought-resistant, the Euphorbia Milii requires adapted watering to bloom well:

💧 Spring/summer: Moderate watering every 10 to 15 days. Wait until the substrate is dry on the surface before watering again.

❄️ Winter: Drastically reduce watering, 1 monthly watering is sufficient if the plant is kept cool.

💀 Warning: Excess water can quickly cause root rot, especially during cold periods.

A tropical plant par excellence, the Euphorbia Milii loves warmth:

🌡️ Ideal: 20 to 30 °C, even in heated interiors.

❄️ Minimum: 10 °C. Below this, it enters dormancy. Frost is fatal, and it must be overwintered indoors in temperate regions.

🪨 A draining substrate is essential to prevent rot:

Mixture of cactus substrate + addition of 40 to 50% perlite + possible top dressing with pumice stone to keep the base dry

This is its strong point:

🌸 Duration: almost all year round, with a peak in spring and summer.

🎨 Colors: red, pink, white, yellow, orange depending on the cultivars

🧡 Tips: The more light and warmth it receives, the more abundantly it will flower.

FAQ - Euphorbia Milii

What is the best exposure for Euphorbia Milii?

Euphorbia Milii loves the sun! To maximize flowering, place it in full sun or next to a south-facing window. It also tolerates very bright indirect light, but will produce fewer flowers.

How often should Euphorbia Milii be watered?

During the warm season, water every 10 to 15 days, allowing the substrate to dry thoroughly between waterings. In winter, greatly reduce watering to about once a month to prevent rot.

What substrate should be used for Euphorbia Milii?

A very well-draining mix is essential. Use a suitable cactus substrate mixed with 50% perlite, with a layer of pumice on the surface if needed.

Why is my Euphorbia Milii not flowering?

Lack of light is often the cause. Also check that the temperature is sufficient and that you are not overwatering. A special cactus fertilizer in spring can stimulate flowering.

Is Euphorbia Milii toxic?

Yes, like all euphorbias, it contains an irritating white latex. Handle with care and avoid contact with skin or eyes.

Can Euphorbia Milii be pruned?

Yes, you can prune it to give it a denser shape. Prune after flowering while wearing gloves, as the plant produces toxic latex.

What is the minimum temperature tolerated by Euphorbia Milii?

It does not tolerate frost. Bring it indoors as soon as temperatures drop below 10 °C. It grows very well indoors all year round.

Should Euphorbia Milii be fertilized?

Yes, during the growing period, apply cactus fertilizer once a month to support flowering.

How can you tell if Euphorbia Milii lacks or receives too much water?

Soft or drooping leaves indicate overwatering, especially if the substrate remains wet. Conversely, rapid drying and leaf drop indicate underwatering.

Can Euphorbia Milii be grown outdoors?

Yes, in warm, frost-free regions. It enjoys sunny terraces and balconies, but must be brought indoors in winter if the climate is cold.