Growing Soft Fruit in Containers on a Patio

Why soft fruit suits a patio

Not everyone has a half-acre and a fruit cage. Plenty of us have a south-facing patio, a few square metres of gravel, or a balcony that catches the afternoon sun — and that is more than enough for a serious crop of strawberries, blueberries and currants. Grown in pots, these fruits give you something a bed never can: complete control. You can shuffle a pot into the warmest corner in June, lift it clear of a late frost in May, and give each plant the exact compost it craves.

Blueberries make the point best. They need acid soil, and most British gardens are anything but. In a container filled with ericaceous compost, the problem simply disappears. The trade-off is commitment: compost in a pot dries out quickly and its nutrients leach away with every watering, so you will water and feed far more often than a ground-planted grower. Do that properly and a well-tended patio pot will crop as generously as anything in open ground.

Choosing varieties that earn their space

Space on a patio is precious, so pick with care. For strawberries, summer-fruiting types such as 'Cambridge Favourite' give one big, concentrated crop in June and July — ideal if you want punnets for jam. Perpetual or autumn-fruiting types such as 'Flamenco' crop in flushes from July right through to October, which suits grazers better. Alpine strawberries are smaller but intensely flavoured and will seed themselves about happily.

For blueberries, look for compact and self-fertile cultivars if room is tight. Even then, planting two different varieties together will give you bigger, better berries. Good choices include:

• 'Top Hat' — genuinely dwarf, happy in a 30cm pot.
• 'Bluecrop' — reliable, heavy-cropping, good autumn colour.
• 'Sunshine Blue' — self-fertile and tolerant of slightly less acid conditions.

Currants are the underrated ones. Blackcurrants crop on young wood, so a compact variety such as 'Ben Sarek' will perform well in a large pot. Redcurrants and whitecurrants fruit on older wood and are slower to settle, but a single well-grown bush in a 45cm pot will give you strings of jewel-like fruit for garnishing and jelly. Give them the sunniest spot you have.

Pots, compost and planting

Size matters more than style. Strawberries are happy in a 5-litre pot or a trough; blueberries and currants need at least 30–45 litres. Terracotta looks lovely but dries out fast, so glazed or plastic pots are often the practical choice. Whatever you use, drainage is non-negotiable: a layer of crocks or broken polystyrene in the base, and plenty of holes.

For strawberries and currants, a loam-based compost such as John Innes No. 3 holds moisture and weight well and stands up to a full season. Blueberries must have ericaceous compost and nothing else — no garden soil, no lime, no mushroom compost. Water them with rainwater wherever possible, as tap water in hard-water areas will gradually push the pH up and leave the plants yellow and sulky. Plant in early spring or autumn, setting the crown of strawberries just at surface level, never buried.

Watering: the job that decides your crop

Almost every container fruit disappointment comes down to water. In July, a large pot in full sun can need watering twice a day. Little and often beats a weekly soak, because you want the whole rootball damp, not just the top inch. Stand pots on saucers or trays in high summer so there is a reservoir to draw on, but empty them in wet spells.

A few habits make life easier: mulch the surface with bark chips or gravel to slow evaporation, push strawberries through a collar or straw so the fruit sits clear of wet compost, and group pots together so they shade each other's rims. If you can, site a water butt near the patio — blueberries in particular repay you for it.

Feeding through the season

Compost nutrients run out after about six weeks, so feeding starts early and continues steadily. From the moment flowers appear, give strawberries and currants a high-potash tomato feed every ten to fourteen days — this pushes energy into fruit rather than leaves. Blueberries want a dedicated ericaceous feed, or a seaweed tonic, from spring onwards.

In spring, before flowering, a general-purpose feed helps currants build strong new growth. Resist the temptation to overfeed with nitrogen: you will get a handsome bush and very little fruit. Stop feeding by late August so plants harden off before winter.

Pests, pruning and planning ahead

Birds will find your berries before you do, so net strawberries and currants as soon as the fruit colours — use a fine net pulled taut, not draped, so birds cannot peck through it. Watch for vine weevil grubs in pots, which hollow out roots; a drench in late summer deals with them. Currant sawfly strips leaves to skeletons in May, so check the undersides of leaves and pick off the caterpillars by hand.

Prune blackcurrants in winter by removing a third of the oldest stems at the base. Redcurrants need only light tipping and the removal of congested wood. Blueberries need very little: just take out dead or crossing shoots in late winter. Strawberries are best replaced every three years, so root a few runners each summer to keep a young, vigorous succession coming. Rotate your pots, refresh the top few inches of compost each spring, and your patio will keep you in soft fruit for years.