Bougainvillea Bonsai Care guidelines
The bougainvillea needs full sun and high temperatures for producing flowers and for that reason it should be placed outside in a sunny place during the growing season. In autumn the tree should be taken into a cool room with sufficient light (or under grow lights) and at temperatures not below 50°F / 10° C and best not over 59° F / 15° C, which is unfortunately not easy to achieve in many houses.
Water the bougainvillea thoroughly when the soil gets dry, but avoid constant soil wetness which will lead to root rot, fungal problems, insect susceptibility and death. The species prefers a pH value of 6 to 6.5, so avoid using highly calcareous water. Continue reading about watering Bonsai trees.
WateringFree lecture from the Beginners Course
Apply solid organic fertilizer once a month or use a liquid fertilizer every week during the growing season and every two weeks in winter.
Cut the shoots after flowering, leaving two leaves on each and prune twigs and branches in autumn or winter. The bougainvillea can bud from old wood after hard pruning. If you want the tree to flower, don't pinch and trim it too much in summer. Use cut paste on larger cut wounds. Those heal over slowly. Wiring is possible on young shoots and twigs but older branches are very stiff and break easily. Beware of the thorns when you are wiring bougainvilleas. Continue reading about pruning Bonsai trees.
Repot smaller bougainvilleas every two or three years. Larger specimens can be repotted every three to five years. A well-draining standard soil mix is fine for this species. The roots of the bougainvillea are yellow, thin and delicate. Take good care not to tear off the roots when you remove the rootball from the pot! Untangle the roots tenderly and don't use the root rake with force. Root pruning is tolerated well. Continue reading about repotting Bonsai trees.
The bougainvillea can be propagated from cuttings. Best results are achieved in spring and summer with semi-hardwood cuttings or root cuttings. Air-layering is also possible. For more detailed information on these techniques, try our Bonsai tree care section.
The bougainvillea tends to be pest resistant as long as is kept healthy and free from wet soil conditions or lack of light. Weak plants can be attacked by powdery mildew, aphids, scale, mealy bug, white fly or caterpillars. In that case use specific pesticides and try to improve the conditions for your tree. When the flowers wilt, cut them off to prevent rot. For more detailed information on these techniques, check out our Bonsai tree care section.
Bougainvillea bonsai tree
Leaves of the Bougainvillea
Orange flowers on this Bougainvillea
General information about the Bougainvillea Bonsai tree
There are also varieties with red, pink, orange, yellow, white or double bracts. The flowers appear in terminal or axillary tufts from summer to autumn if the plant gets enough light and heat. Bougainvillea leaves are oval to lanceolate and are positioned in an alternate pattern. The bark is beige-grey and with age it gets furrowed and gnarly.
The species is native to South America and was named after the French seafarer and author Louis-Antoine de Bougainville (1729 - 1811), whose ship's doctor and botanist had discovered the plant in Tahiti and dedicated it to his captain in 1767. Bougainvilleas are fast growing, tolerate pruning very well and are well suited for most bonsai styles. As they are subtropical plants, they can't endure frost and need temperatures around 50° F – 59° F / 10° C – 15° C in winter. If you need help identifying your tree, take a look at our Bonsai tree identification guide.