Harvest blackcurrants when the berries are fully black, soft, and come away easily from the strig (the small stem that holds each berry). In most climates, this is July to August. Pick on a dry day — wet berries spoil fast. A mature bush produces 3 to 5 kg of fruit per season, and the berries all ripen within a two to three week window.
Blackcurrants are one of the few fruits that are easier to pick by the whole strig rather than individual berries. Slide your fingers down the strig and the ripe berries fall into your hand. It takes about 10 minutes to strip a mature bush. The care guide covers the growing conditions that produce the heaviest crops.
When to Harvest: Ripeness Signs
Blackcurrants are ripe when the berries are uniformly black with a slight sheen, soft to gentle pressure, and sweet when tasted. Underripe berries are hard, shiny, and tart. Overripe berries are dull, very soft, and may split on the bush.
The entire strig does not ripen all at once — berries at the tip ripen first. For fresh eating, pick individual ripe berries as they color up. For cooking or processing, wait until 80 percent of the strig is ripe and pick the whole strig at once.
Harvest in the morning after the dew has dried. Wet berries bruise easily and mold within hours. If rain is forecast, pick before the storm rather than after — ripe berries left on the bush in wet weather split and rot quickly.
How to Pick: Strig by Strig
Hold the strig gently between your thumb and forefinger at the base. Slide your hand upward and the ripe berries will fall into your cupped palm. Drop them into a shallow container — deep containers crush the bottom berries under the weight of those above.
Do not pull the strig off the cane. The strig is attached to a small piece of woody stem that will break off with it if you are not careful. Pinch the strig at its base where it meets the cane, and it will separate cleanly.
For large harvests, lay a tarp or sheet under the bush and strip the canes directly over it. This is faster than picking strig by strig but produces a mix of berries and debris that needs to be sorted afterward.
Storing and Using the Harvest
Fresh blackcurrants keep in the refrigerator for 5 to 7 days in a single layer on a paper towel. Do not wash until ready to use — moisture accelerates spoiling. For longer storage, freeze the berries spread on a tray and then transfer to a freezer bag. Frozen blackcurrants keep for 12 months and are excellent for cooking, smoothies, and jam.
Blackcurrants are one of the richest sources of vitamin C in the plant kingdom — 180 mg per 100 grams, four times more than oranges. They are also high in antioxidants, potassium, and gamma-linolenic acid (GLA). Modern sweet varieties like ‘Ben Tirran’ and ‘Big Ben’ are genuinely pleasant to eat fresh, not just cooked.
The varieties guide covers which cultivars are best for fresh eating versus cooking. After harvest, feed the bush with potash and top up the mulch — this helps the new canes set fruit buds for next year’s crop.
Bird Protection: The Essential Step
Birds love blackcurrants and will strip a bush clean within days of ripening. Netting is not optional — it is essential. Drape bird netting over a simple frame (bent PVC pipe or wooden stakes) and secure it at the base so birds cannot get underneath.
Remove the netting only for harvesting, and replace it immediately after. Blackbirds, thrushes, and starlings can detect ripe fruit from a distance and will descend on an unprotected bush the moment you turn your back.
After harvest, remove the netting and store it dry for next year. Check for holes and repair before the next season. Good netting lasts 5 to 7 years and is the single most important investment for a reliable blackcurrant harvest.
