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When pruning injures or removes the branch collar, the trunk xylem above and below the cut is rapidly infected by the microorganisms inhabiting the wood and decay of the plant occurs. [ 1 ] Optimal pruning is carried out by cutting with respect to the perimeter of the branch collar and cutting adjacent to it. [ 1 ]
B. delavayi spring inflorescence. Buddleja delavayi is a deciduous shrub or small tree growing 2 – 6 m high by up to 3 m wide. The young branches and shoots are rounded, bearing elliptic leaves 1.5 – 6 cm long, usually with short < 4 mm petioles, the margins either serrate or entire.
A rule of thumb when pruning is: “If it blooms in the spring, prune the plant soon after flowering; if it blooms in the summer, prune in the spring.”
Buddleja asiatica is a somewhat tender deciduous shrub native to a vast area of the East Indies, including India, Nepal, Bangladesh, China, Taiwan, Burma, Thailand, Laos, Cambodia, Vietnam, Malaysia, New Guinea, and the Philippines, growing in open woodland at elevations < 2,800 m either as understorey scrub, or as a small tree. [1]
B. salviifolia, white form.Longstock Park Nursery. Buddleja salviifolia is a large, semi-evergreen shrub, multi-stemmed, with untidy, drooping branches, typically reaching a height of 4 – 8 m.
Buddleja crispa, the Himalayan butterfly bush, [1] is a deciduous shrub native to Afghanistan, Bhutan, North India, Nepal, Pakistan and China (Gansu, Sichuan, Tibetan Autonomous Region), where it grows on dry river beds, slopes with boulders, exposed cliffs, and in thickets, at elevations of 1400–4300 m. [2]
Buddleja officinalis is a deciduous early-spring flowering shrub native to west Hubei, Sichuan, and Yunnan provinces in China. [1] Discovered in 1875 by Pavel Piasetski, [2] a surgeon in the Russian army, B. officinalis was named and described by Maximowicz in 1880.
Buddleja araucana is endemic to the semi-deserts and steppes of Patagonia, from southern Mendoza to Río Negro and Neuquen provinces in Argentina, and adjacent Chile. [1] The species was first described and named by Philippi in 1873, [2] it was introduced to cultivation by the British gardener and plant collector Harold Comber [3] as a form B. globosa in 1925.