How to Grow Delonix regia (Flamboyant Tree)? Detailed Guide to Planting Methods and Precautions

Delonix regia is native to the wilds of Africa and is a tall deciduous tree. It is grown both for its foliage and its flowers, and the blooms are extremely vivid in color, mainly red and orange, resembling a phoenix, which is how it got its name. So how exactly is this beautiful plant grown, and what points need attention? Let's take a look below.

How to Grow Delonix regia

1. The planting site should be chosen in an open, sunny spot, and during dry weather it should be watered thoroughly. Delonix regia has low soil requirements and can grow well even in rather poor, thin soil, because its roots have rhizobia that can fix nitrogen and increase soil fertility. However, waterlogging will kill the rhizobia and affect the plant's growth.

2. Transplanting has a high survival rate before bud break in spring; it can also be planted in the rainy season, but part of the branches and leaves should be pruned off to ensure survival. The plant has strong sprouting ability, so the trunk-cutting method can be used to cultivate large saplings. After planting out, loosen the soil and weed 2 to 3 times each year, water in a timely manner, apply a topdressing once each in spring and autumn, and promptly remove root suckers to ensure good tree growth.

Delonix regia Planting Methods and Precautions

I. Planting Methods

1. Soil: Delonix regia can tolerate relatively poor soil, but it prefers fertile, organic-rich, loose soil. Grown in the most suitable soil environment, the phoenix flowers it produces are even more brilliant and striking. Delonix regia has a shallow root system, but its roots are very well developed and firmly anchored, giving it strong wind resistance.

2. Transplanting and planting out: Transplanting of Delonix regia is aimed at seedling growth; seedlings about 1-2 years old should be transplanted into a fertile, loose, sunny environment. Transplanting is usually carried out in early spring, and after transplanting the row spacing of the plants should be kept at about 60 cm.

After 1-2 years of transplanting, once the seedlings have grown, they can be planted out. Planting out has low soil requirements and can even be done in poor soil, but the site chosen must also be open and sunny.

3. Watering: The Delonix tree can tolerate drought, but the amount of water must be controlled. Because its roots contain rhizobia, in poor soil it can fix nitrogen to increase soil fertility, but waterlogging will cause the rhizobia to die, thereby affecting the normal growth of the whole plant.

II. Precautions

The common pest of Delonix regia is an insect of the “night moth” type. Its larvae feed on the plant's leaves and cause damage, often eating all the host's leaves and seriously affecting the tree's growth and ornamental value. Delonix regia pest damage is most severe in July, August and September. The Delonix regia night moth is not harmful to humans, but some people will develop allergic symptoms because of it.

To deal with this situation, the solution used is to seize the period when the larvae gather to cause damage and dust with powder in the early morning before the dew has dried. You can use 2.5% trichlorfon powder or 1.5% parathion (1605) powder, or 1.5% dimethoate powder for dusting, at 1.5-2 kg per mu.

How to Prune Delonix regia

Use the open-center layered form of mixed pruning, and determine the number of branch layers kept according to seedling height; usually 2-3 layers is suitable. This is not only beautiful in appearance, but because there are more branches and leaves, it also benefits the tree's vegetative growth and root development. For a formed tree, the main thing is to pay attention to pruning the whorl of branches at the top of the trunk, ensuring the absolute dominance of the leading shoot at the top of the central trunk, and weakening and thinning out the whorl of branches that grew at the same time as it. If, because the branches are too vigorous, a branch forms a competitive state with the trunk, it must be pruned and controlled in a timely manner and must never be left alone, so as to avoid forming a forked tree shape.

Delonix regia Propagation Methods

Delonix regia is generally propagated by sowing. In December, collect mature Delonix regia seeds and place them in the sun to dry. The pods will open naturally, or they can be beaten with a wooden stick so that the seeds fall out. Put the seeds in burlap sacks and store them in a cooler, dry, ventilated place; their viability can be preserved for more than 1 year. Sow again the following spring.

Although Delonix regia is beautiful, it is not so easy to grow, and what we generally see now are artificially cultivated varieties, usually propagated by sowing. This method has a relatively high survival rate and also solves the big problem of it being on the verge of extinction, so this reminds us all that when growing it we must be careful, careful, and more careful.