Information on Thornless Blackberry Plants

Written by carrie terry
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Information on Thornless Blackberry Plants
Blackberries thrive in the warmth of summertime. (blackberry image by spectator from

Blackberries are thriving, vining bushes that come to life every spring. These plants can live for 15 to 20 years with the right care, bringing large berry harvests to the lucky gardener throughout the summer. When you plant a blackberry plant, follow some specific guidelines, and expect it to bear fruit within a year.

Thornless Blackberries

Thornless blackberries are a type of blackberry bush that grows without the inch-long thorns of a standard blackberry bush. They grow the same berries, and require the same care and conditions as standard types. Thornless blackberry bushes can grow up to 10 feet high and 10 feet wide.

Sunshine and Warmth

Like all fruit trees and plants, thornless blackberries require full sun exposure to grow and thrive. Plant thornless blackberries in sites that get six to eight hours of bright summer sun every day, to keep the vines nourished and warm. Blackberries that are planted in shade will not bear fruit.

Water and Compost

Blackberries need good drainage and a strong growing foundation. Choose a spot that drains quickly after a storm, and turn a mixture of half compost and half quick-draining soil into the site. Thornless blackberries should receive 1 to 2 inches of water a week to keep the site moist.

Fertiliser and Staking

Because thornless blackberries grow on vining plants rather than standard bushes, they need structural support. Train blackberries to grow on a trellis system to keep them up off the ground. Fertilise blackberries every spring with a 10-10-10 fertiliser, to help with blooming and growing. Phosphorus-heavy fertiliser will add an additional boost to a berry's blooming and fruiting.


Blackberries are a summertime fruit, and go dormant over the winter. Plant new thornless blackberries in spring, when the ground thaws, and begin to pay attention to established plants in the spring. Once they begin to grow and bloom, blackberries will need more water and care than over the winter.

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