Crown of Thorns needs a draining root zone and enough light. Keep the container stable and take care around the spiny stems when moving it.
Crown of thorns needs light and drainage
Euphorbia milii grows as a prickly succulent shrub. The colorful parts around its small flowers are bracts. Give the plant a bright position and gradually introduce stronger exposure where needed.
Water according to active growth
Use a draining pot and open medium. Water the roots when the mix has dried appropriately, then empty any outer vessel. Cool, quiet growth needs less water than a leafy plant growing in warm conditions.
Shape with care
Leave room for stems and use appropriate protection when handling thorns or damaged tissue. Euphorbia sap needs care around skin and eyes. Keep cut material away from food, children and pets, and use an authoritative profile for specific handling questions.
Do not force continuous flowers
Maturity, light, temperature and the selection affect the display. A resting plant may drop leaves without needing to be soaked or heavily fed. Inspect the base and roots if deterioration spreads, rather than assuming all leaf loss is the same seasonal event.
Related reading
Crown of Thorns Forms: Bracts, Leaves and Stems