The tree wisteria is certainly one of the most spectacular of our indigenous trees when in flower, mimicking the splendour of the jacaranda, which unfortunately is proving to be an invader species in parts of South Africa. Given time and effort this tree could replace the jacaranda trees from Argentina and carpet Pretoria streets with indigenous purple blooms instead. This decorative, small to medium-sized tree is deciduous, dropping its leaves only for a short period in early spring. The tree is normally multi-stemmed, but it can be pruned to form a single stem. The bark of the stem is brownish grey, rough and deeply fissured. Leaves, which are spirally arranged, are suspended from drooping branches. The drooping, blue-mauve, fragrant, pea-like flowers hang from the branches in bunches, often covering the whole tree. Flowering time is from August to January (spring and early summer). Flowers are followed by papery, brown fruit pods, that hang from the branches in clusters, and never split to release their seeds. Being a protected tree in South Africa, wild specimens may not be removed, cut down or damaged.
Bolusanthus Care
Bolusanthus Speciosus
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Humidity
Normal
Lighting
Full Sun
Temperature
17°C - 27°C
Hardiness zone
9B - 11
Difficulty
Medium
Hibernation
Cold Period
How to Care for the Plant
Water
Water moderately when young.
Pruning
At this stage, the foliage is probably helping to sustain the growth, so I would recommend that you avoid pruning it. Rather opt to stake the tree to help protect the trunk during your cyclone period.
Fertilizer
To help establish your new Lavender Wisteria Tree, fertilize sparingly ten inches away from the base, tri-annually with a slow time released product. Unfertilized they will tend to grow at a slower pace. Note: The heavy salts in cheaper fertilizers will damage the roots and possibly kill the plant. Its best to use a brand you know and trust.
Sunlight
Remember, it is normal in a natural situation for the trees to grow taller than the surrounding plants in order to get more light.
Soil
A good soil mixture would be equal parts of river sand, loam and compost. With good care this tree can grow up to 800 mm per year. Bolusanthus speciosus can withstand moderate frost, but will need protection for the first few years. It can also survive periods of drought.
Temperature
Best in areas where temperatures remain between 17-27C. Drought tolerant once established. Tolerates light frost but needs protection from first for the first few years after planting. Fixes nitrogen in the soil.
Container
It can be grown in a container and looks spectacular on any sunny patio.
Additional
Toxic to animals Small to medium sized deciduous tree. After it loses its feathery, light green leaves in spring it produces long sprays of violet-blue flowers. It is slow growing and has a weeping shape.
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