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How to prune blackberries
Prune part of the stem.
When planting a blackberry vine as a rooted cutting, prune off two-thirds to three-fourths of the handle or stem, leaving only a short crown behind. Doing so stimulates the buds at the crown of the cutting, encouraging them to grow more vigorously.
Select from:
a). On most rose bushes, the stem section is the most vigorous part of the pruning, as it becomes closer to the stem than the base portion. This may reduce the height of the stems.;
b). Trim around other foliage and dead shoots along their sides to enhance the appearance of the stem. Trim flowering canes near the top, which help them develop full sun formation.;
c). Control water irrigation at the beginning of the cutting. Let the soil sink overnight before irrigation to draw water from the plants.;
d). The " crown " of the cutting refers to the portion of the cutting that extends just above ground once the cutting is planted. Cutting off most of the stem also removes any potentially damaged or diseased tissue that may have been on the stem.;
d).