Oliver Radcliffe
Why Blackberries Earn Their Place in a Small Garden
The wild bramble scrambling through every hedgerow is a thug, and nobody with a modest plot wants it. Cultivated blackberries are a different creature altogether. Modern varieties crop heavily, fruit over a long season, and — crucially for a small garden — many are thornless and naturally compact. Train one against a sunny wall or fence and you will harvest a generous bowlful from a strip of ground barely a spade wide. The canes earn their keep ornamentally too, with soft pink or white blossom in early summer and leaves that turn butter-yellow in autumn.
Best of all, blackberries are forgiving. Give them reasonable soil, a little sun and a firm hand with the secateurs, and they will reward you for years.
Choosing a Compact, Thornless Variety
Variety choice matters more than anything else when space is tight. 'Loch Ness' is the reliable standby: thornless, semi-upright, and it crops heavily from late August into September on canes that are easy to keep in order. 'Ouachita' is similarly thornless with a long picking season and unusually sweet fruit. If you have only a metre or two of wall, grow a single plant rather than a row and fan the canes out low down — you will still pick plenty.
Buy bare-root plants between November and March if you can. They establish better than potted stock and cost considerably less. One plant will give you a light crop in its second year and a proper harvest from the third.
Planting and Training Against a Sunny Wall
Blackberries want sun and shelter. A south- or west-facing wall is ideal; a north wall will still fruit, but it ripens later and tastes thinner.
- Improve the ground before planting. Fork in two buckets of well-rotted manure or garden compost per square metre, plus a handful of general-purpose fertiliser.
- Check the pH if you can. Blackberries prefer slightly acidic soil, around pH 6 to 6.5, though they will tolerate most reasonable garden soil.
- Space plants 1.5–1.8m apart, setting the crown just below soil level so new shoots emerge cleanly.
- Fix three horizontal galvanised wires to the wall or fence, at roughly 75cm, 1.2m and 1.7m above the ground, on sturdy vine eyes.
- Water in well and cut the new canes back to about 25cm to encourage strong growth from the base.
The wires are the whole trick. Canes tied in flat against them stay tidy, catch the sun, and — most importantly — put the fruit at arm's height rather than in a prickly tangle at your ankles.
Feeding, Watering and Mulching Through the Season
Blackberries are hungry, thirsty plants while they are swelling fruit. Water deeply once a week through dry spells from flowering onwards, aiming for a good soak rather than a daily sprinkle. A mulch of garden compost or bark chippings in spring keeps moisture in and suppresses weeds, which compete badly with shallow-rooted canes.
Feed in late winter with a balanced general fertiliser, then again in early summer with a high-potassium tomato feed as the flowers set. If growth looks pale or yellow between the veins, a dose of sequestrated iron will green it up within a fortnight.
Watch for birds once the fruit colours — a sheet of netting draped over the wires, pegged down at the base, is usually enough. Grey mould can appear in damp, crowded conditions, so keep the canes spaced and pick regularly.
Pruning: The Secret of a Manageable Harvest
Here is the one piece of knowledge that separates a tidy, productive blackberry from an unruly thicket. Blackberries fruit on second-year canes — the growth made last season. Once a cane has fruited, it will never fruit again.
- Summer: as new canes reach about 1.2m, pinch out the growing tips. This forces them to branch, and branching is where next year's flowers come from.
- After harvest, in late summer or early autumn: cut every cane that has just fruited right down to the ground. Do not leave stumps.
- At the same time: select five or six of the strongest new canes and tie them in to the wires, fanning them out evenly. Cut out everything else at the base.
- Late winter: shorten the side shoots on your tied-in canes to two or three buds to concentrate the plant's energy.
A mature plant should carry no more than six to eight canes in total. More than that and you get smaller fruit, more disease and a job you will put off until it becomes a nightmare.
Picking, Storing and a Cottage Kitchen Idea
Pick from mid-August, when the fruit turns dull black and pulls away from the core with almost no tug. A shiny blackberry is not ripe; leave it a day or two. Gather into shallow trays rather than a deep bucket so the fruit does not crush, and pick every few days through the season.
Blackberries keep only a day or two in the fridge, so freeze them spread on a tray before bagging, or cook them straight away. The classic cottage pairing is blackberry and apple: stew the fruit with a little sugar and a splash of water, layer it under a crumble topping of flour, butter and demerara, and bake until bubbling. They also make a superb hedgerow vinegar — cover the fruit with cider vinegar for a fortnight, strain, then sweeten to taste — and an old-fashioned cordial that tastes like bottled September. Once you have grown your own against that sunny wall, you will wonder why you ever left them to the hedgerow.
