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Some Buddleja cultivars are either sterile or produce less than 2% viable seed (see "Non-invasive" Buddleja cultivars). [ 29 ] [ 30 ] [ 33 ] [ 34 ] The state of Oregon , which designates B. davidii as a " noxious weed " and initially prohibited entry, transport, purchase, sale or propagation of all of its varieties, amended its quarantine in ...
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Wilt itself is the most common symptom, with wilting of the stem and leaves occurring due to the blockage of the xylem vascular tissues and therefore reduced water and nutrient flow. In small plants and seedlings, Verticillium can quickly kill the plant while in larger, more developed plants the severity can vary.
Buddleja stenostachya can grow to 3 m in height, its shoots covered by a dense white indumentum. The oblong-lanceolate leaves are of variable size, < 20 cm long by 6 cm wide; they are long pointed, tapered at the base, with only slightly toothed or occasionally entire margins. The upper surfaces are dull green in colour, the undersides, like ...
A reduction cut may be performed while still allowing about 50% of the branch. This is done to help maintain form and deter the formation of co-dominant leaders. Temporary branches may be too large for a removal cut so subordination pruning should be done to slowly reduce a limb by 50% each year to allow the tree to properly heal from the cut.
Buddleja globosa is a large shrub to 5 m (16 ft) tall, with grey fissured bark. The young branches are subquadrangular and tomentose, bearing sessile or subsessile lanceolate or elliptic leaves 5–15 cm long by 2–6 cm wide, glabrescent and bullate above and tomentose below.
Buddleja marrubiifolia is a dioecious multi-branched shrub that is 0.5 to 2 m (1.6 to 6.6 ft) high with greyish to blackish rimose bark. The young branches are terete and tomentose, bearing ovate to rhomboid leaves that are 1 to 3 cm (0.39 to 1.18 in) long by 0.6 to 1.5 cm (0.24 to 0.59 in) wide, membranaceous to subcoriaceous, and densely tomentose on both surfaces.
Buddleja alternifolia, known as alternate-leaved butterfly-bush, [1] is a species of flowering plant in the figwort family, which is endemic to Gansu, China.A substantial deciduous shrub growing to 4 metres (13 ft) tall and wide, it bears grey-green leaves and graceful pendent racemes of scented lilac flowers in summer.