Cultivation Tips for Orange Trees

Contrary to popular belief, citrus trees are relatively hardy plants that are mainly threatened by prolonged cold.

A potted orange tree cannot draw nutrients from the ground. Its reserves and nourishment come entirely from the soil and potting mix you provide.

Citrus trees are not native to the Mediterranean but to tropical regions—they love humidity.

• In the ground, plants can reach deep soil layers.

• In containers, the tree relies entirely on the water you provide.

Summer: Water generously and frequently; the draining base allows for overwatering without harm.
Winter: Maintain moderate humidity; observing the leaves is a good way to monitor the plant’s health.

In the 18th century at Versailles, citrus trees were deliberately dried to “force” blooming, filling the orangerie with fragrance in time for balls and festivities.

Root pruning is essential for healthy growth and overall plant health, typically performed every two years in spring.

The goal is to reduce the root ball. Roots and fine roots tend to “circle” inside the container, exhausting themselves without nourishing the plant. Pruning stimulates the growth of new roots, creating fresh nutrient sources.

• Remove one wooden panel.
• Trim 10–15 cm of soil and roots using a small spade and sanitized secateurs.
• Replace the panel and refill with a mixture of soil, sand, and potting compost.
• Water thoroughly.

Light surface pruning between major root prunings can be beneficial.

Why prune?

• To control the size of the tree

• To improve air circulation in the center

• To maintain an elegant shape

Shorten the current year’s shoots by about half, just above a leaf. Pruning can be done throughout the growing season, removing dead wood as it appears.

Outside southeastern France, it is very risky to leave citrus trees outdoors during winter.

A bright, ventilated greenhouse will house the plants from November to May.

During particularly harsh winters, maintain near-zero temperatures using auxiliary heating (electric radiator, oil-filled heater, radiant, or preferably air-pulsed systems). Protect the foliage with covers and insulate the containers with wool or glass/rock wool rolls.

Remember: prolonged cold is more damaging than short, sharp drops in temperature.

Whenever possible, open the greenhouse - fresh air is always beneficial.