This information applies to most berries, including but not limited to, blackberries, loganberries and raspberries.
Berries are dormant when you buy them, so don’t be disappointed when an uninspiring stick arrives. It will start showing signs of life as soon as the weather warms up.
Berries will grow pretty much anywhere (it is keeping them under control that’s the problem). Grow them on a trellis, in an area where you are able to access all parts of the plant easily.
When the weather warms your berries will grow rapidly, and before you know they will fill the whole trellis/entire area available to them.
Berries usually fruit in Autumn, but some varieties start in mid-Summer. Late Autumn (post fruiting)/early Winter is the best time to cut back the berry canes. The plant will lose all of its foliage and look quite dead. Cut out all of the old wood, and leave the new green shoots in tact. You can’t really go wrong. It doesn’t matter if you cut the plants back to the ground, they will show up without fail when the Spring weather starts.
Watch out for thorns when picking fruit and pruning the canes. These will go through the thinner cloth gardening gloves.