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How To Grow Blackberry Plants Successfully

05/12/2011 - Updated on 28/10/2021
in Growing Plants
Reading Time: 3 mins read
The Juicy Blackberry Plant

The Juicy Blackberry Plant

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Once established, blackberry plants can grow like weeds. The best varieties require a bit of planning and preparation to get started, but avid gardeners will find the effort worthwhile at harvest time. Nothing quite matches the sweet, juicy taste of fresh blackberries.

Contents

  • Soil Preparation
  • Pruning
  • Care of Blackberry Plants
  • Blackberry Pests

Blackberries are best grown in areas with cool or cold winters. Planting them from seed is possible, but for a quicker harvest, most people plant bare-root plants. In the coldest areas, upright, stiff-caned varieties can be grown. In areas with warmer winters, trailing types do best. Follow these simple tips to grow blackberries successfully.

Soil Preparation

All blackberries require a deep, well-drained soil, full sun and ample water throughout the growing season. Avoid sites where the soil remains wet late into the fall. Compost should be worked deeply into the soil before planting, as the plants grow best in a soil rich with organic matter. Several days before planting, a balanced fertilizer should be worked into the soil as well.

Blackberries prefer a neutral or slightly acidic soil, with a pH of 7.0 or below. A soil’s pH can be easily determined with an inexpensive test kit, available at most garden centres. If the soil is alkaline, above 7.0 on the pH scale, common sulfur, ferrous sulfate or aluminum sulfate can be used to raise the acidity, although regularly-applied organic soil amendments, such as manure and compost, will lower the pH over time. If the soil is too acidic, ground limestone will raise the pH.

Plant blackberry plants at the first sign of spring, when the soil has warmed and temperatures are mild. Since the plants grow from the base of the crown, some type of physical support is needed to keep them from sprawling. Trailing types are best grown on trellis. Upright varieties benefit from support as well. Set plants 1 to 2 metres apart with a 1½-metre trellis or post next to each plant. For upright varieties, run a wire along the top of the posts and train the branches along the wire. Bare-root plants will take 2 to 4 weeks for the roots to become established.

Pruning

While the roots of blackberries are perennial, the canes are biennial, appearing and growing one year, flowering and bearing fruit the next. Only 1-year-old canes should be trained on the trellis or wire. All the canes that fruited the previous season should be pruned back to the crown of the plant.

Prune canes of the current season growing on the trellis to 1 to 2½ metres. Thin out all but 12 to 16 sturdy canes. These canes will produces side branches, called laterals, during the remainder of the growing season. Cut the side branches back to 30 centimetres, or about 12 buds, in the early spring. With new spring growth, small branches will grow from the side branches. These will be the branches that bear fruit.

Care of Blackberry Plants

Covering the soil around the crown of the plants with a rich, organic mulch will help keep the plants free of diseases and pests, as well as help control weeds. Blackberries can quickly become invasive if left unattended. Remove suckers whenever they appear.

Plants should be fertilized with a commercial fertilizer several times each year. In the coldest areas, plants should be fed when the plant blossoms. In warmer regions, the plants will do better with periodic feeding. Feed once when new growth begins, again in mid-spring and a third time in the middle of the summer.

Blackberry Pests

Red-berry mites, spider mites and whitefly are sometimes a problem with blackberry plants. To control mites, apply a dormant spray containing lime sulfur in winter and again as buds are about to bloom.

Plants started from bare root can be expected to produce fruit the third year after planting. While the canes bloom biennially, by properly pruning older canes each season, plants will produce a bountiful harvest each year.

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