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Red-flowered black locust

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Red-flowered black locust, also known as bristly locust and Jiangnan locust, is a variety of black locust (Robinia pseudoacacia) in the genus Robinia of the Fabaceae family. Because its stems, twigs and flower stalks all bear red bristles, it is named "bristly locust". It has abundant flowers and brilliant colors, and can be planted in groups or as a single specimen for garden landscaping. The leaves of the red-flowered black locust are very similar to those of the black locust: odd-pinnate compound leaves, with opposite leaflets, 7 to 13 in number, elliptical. The papilionaceous corolla is pink or purplish-red, with 2 to 7 flowers forming a sparse raceme. The flowers are sterile, and the pods mostly do not develop, generally producing no seeds, so it is difficult to propagate by seed; black locust is mostly used as rootstock

Red-flowered black locust, also known as bristly locust and Jiangnan locust, is a variety of black locust (Robinia pseudoacacia) in the genus Robinia of the Fabaceae family. Because its stems, twigs and flower stalks all bear red bristles, it is named "bristly locust". It has abundant flowers and brilliant colors, and can be planted in groups or as a single specimen for garden landscaping. The leaves of the red-flowered black locust are very similar to those of the black locust: odd-pinnate compound leaves, with opposite leaflets, 7 to 13 in number, elliptical. The papilionaceous corolla is pink or purplish-red, with 2 to 7 flowers forming a sparse raceme. The flowers are sterile, and the pods mostly do not develop, generally producing no seeds, so it is difficult to propagate by seed; black locust is mostly used as rootstock for grafting.

The red-flowered black locust is a sun-loving tree species with strong cold resistance and tolerance to both drought and poor soil; it can grow in slightly acidic or saline-alkaline soil. However, in overly clayey soil or poorly drained low-lying land, it is prone to root rot and death. It grows fast, tolerates pruning well, has strong suckering ability, and is highly resistant to smoke, dust and harmful gases such as hydrogen fluoride and ozone, making it an excellent tree for greening and beautification. For propagation of the red-flowered black locust, black locust is mostly used as rootstock for cleft grafting (shrub form) and high grafting (small tree form). Method: from late March to early April, graft by the cleft method onto 1- to 2-year-old black locust rootstock. When grafting, select robust rootstock and scions, cut the rootstock off at 10 cm above the ground, split it open in the middle with a sharp knife, and cut the red-flowered black locust scion into a wedge shape and insert it, aligning the cambium layers, tie it slightly, and mound soil to cover it completely; it will take in two weeks after grafting, then remove the covering soil and promptly cut off sprouting buds. After the graft takes, it grows very fast and generally blooms the next year. High grafting is done by selecting large-sized black locust and grafting at a certain height to form a small tree shape. After it takes, the red-flowered black locust grows very fast, its crown spreading in an umbrella shape, and it blooms the next year, very beautiful. Shaping and pruning are needed every year, thinning out crossing branches and overlapping branches to keep the crown intact.

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