Blackcurrants are the hardiest and most reliable of the currants, and they are also one of the most productive soft fruits you can grow: a single mature bush can give several kilos of fruit every summer, year after year, with almost no work. The berries are sharp, deeply flavoured and packed with vitamin C, perfect for jams, cordials, puddings and freezing.
What makes blackcurrants especially good for cold gardens is that they actually need a cold winter to fruit well, so they thrive in Zones 3–7 where tender fruit struggles. They are also easy to grow in a partially shaded spot, which is rare for a fruiting bush, and a row of them makes a productive hedge that needs little more than an annual mulch and prune.
Blackcurrants at a glance
| Growing factor | What blackcurrants need |
|---|---|
| Sun | full sun |
| Soil pH | 6.0–6.5 |
| Days to germination | 14–28 |
| Days to maturity | 365–730 |
| Spacing | 48–60 inches apart |
| Water needs | moderate |
| Cold tolerance | hardy |
| Family | Grossulariaceae |
Starting seeds
Blackcurrants are almost always grown from bare-root or potted nursery bushes rather than from seed, which is slow and unreliable — the "both" sowing method covers both routes, but the bush route is the one that fruits on schedule. Plant bare-root bushes in late autumn or very early spring while they are dormant: in Zones 3–5 that means as soon as the ground thaws, in Zones 6–8 late autumn or early spring, and in Zones 9–10 autumn planting works well. Zones 11–13 are frost-free, so plant in the cooler months and keep young bushes well watered; confirm exact timing with your local extension service. Seed germination takes 14–28 days, and a seed-grown bush needs far longer to reach the 365–730-day maturity in the data, so buy named varieties as bushes. Our seed starting calculator is useful if you do try seed, and the planting calendar by ZIP gives your local planting window.
Transplanting and planting out
Set bare-root bushes so the roots spread naturally and the crown sits at the same depth it grew at the nursery — too deep and the bush sulks. Space bushes 48–60 inches apart to leave room for air movement and picking. Water well after planting, mulch the root zone, and cut back the top growth by about a third on a bare-root bush to balance the roots you disturbed.
Soil and feeding
Blackcurrants are not heavy feeders, but they fruit best in soil that is rich in organic matter. Work compost into the planting area before planting and mulch the root zone every year with well-rotted compost or bark. Feed lightly in spring as growth starts, with a balanced fertiliser at the label rate, and avoid feeding late in the season, which pushes soft growth that frost damages. The soil pH target is 6.0–6.5 — test your soil and adjust only if a test shows you need to, rather than guessing.
Watering
Blackcurrants have moderate water needs: keep the soil evenly moist while plants are establishing and flowering, and water deeply rather than little and often so the roots grow down. Water at the base in the morning so the foliage dries during the day, mulch to hold moisture in, and watch for wilting in hot, dry spells. Our watering calculator gives a starting point for your bed size, and the watering schedule generator can build a routine around it.
Sunlight and temperature
Blackcurrants need full sun — at least six hours of direct sun a day. Blackcurrants are hardy and tolerate frost and cold weather well, so they can be planted out earlier and left in the ground over winter in most zones. In frost-free Zones 11–13, heat and a lack of winter chill can limit performance, so give them the coolest spot you have. Check your zone with the hardiness zone finder before choosing varieties. Our sunlight calculator can check whether your spot gets enough sun.
Pests and diseases
The pests and diseases to watch for on blackcurrants are aphids, slugs, cutworms. Blackcurrants are generally healthy bushes. Aphids cluster on shoot tips in spring, and slugs can damage low fruit, so keep the base clear of weeds and mulch. Check plants weekly, looking under leaves as well as on top, and act early. Hand-pick larger pests, knock aphids off with a strong spray of water, and remove badly affected leaves. Keep the area weed-free and avoid wetting the foliage when you water, since damp leaves invite fungal disease. Our pest identifier helper can help identify what you are seeing, and the plant disease checker helps narrow down leaf and stem problems.
Companion plants
Good companions for blackcurrants are borage, marigolds, clover, chives. Marigolds and borage planted nearby attract pollinators and beneficial insects, while clover under the bushes acts as a living mulch and keeps the soil moist. Our companion planting finder can suggest more pairings for your bed plan.
Harvesting
Pick blackcurrants when the berries are fully black, plump and come away easily from the stalk — taste one first, because they sweeten in the last few days on the bush. Harvest a whole strig (the cluster) at once by snipping it off, then strip the berries at the kitchen table, which is faster than picking them one by one. Expect the main crop in mid to late summer, and pick on a dry day so the fruit stores well. Freeze any surplus the same day. Our harvest date calculator can estimate your picking date from your sowing date, and the vegetable yield estimator helps you work out how much a bed will produce.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Small berries | drought while fruit is swelling | Water deeply during fruiting and mulch well in spring. |
| Poor cropping | bush too old or never pruned | Prune out a third of the oldest stems each winter to renew the bush. |
| Leaf curl on shoot tips | aphids feeding on young growth | Pinch out badly affected tips and spray aphids off with water. |
Small berries
Blackcurrants size up their fruit quickly, and a dry spell while berries are swelling leaves them small and sharp. Water deeply once or twice a week through the fruiting season rather than sprinkling daily, and mulch in spring to hold the moisture in.
Poor cropping
Blackcurrants fruit best on young wood, so a bush that is never pruned gradually fills with old, unproductive stems. Each winter, cut out about a third of the oldest stems right down to the base, and the bush will throw up vigorous new fruiting shoots in spring.
Leaf curl on shoot tips
Aphids cluster on the soft shoot tips in spring and curl the leaves. It looks worse than it is: pinch out the worst tips, wash the rest off with a strong spray of water, and ladybirds usually finish the job within a week or two.
Frequently asked questions
How long does it take to grow blackcurrants?
From planting to maturity takes 365–730 days — about 1–2 years (365–730 days from planting). Seed germination takes 14–28 days, and the total time depends on whether you start from seed, a nursery plant, or a bulb or cutting.
How far apart should I plant blackcurrants?
Space blackcurrants 48–60 inches apart. That spacing gives each plant room for air movement, which keeps disease down, and room to reach its full size without crowding its neighbours.
What soil pH do blackcurrants need?
Blackcurrants prefer a soil pH of 6.0–6.5. Test your soil before amending it — most garden soils are close enough, and guessing with lime or sulphur can do more harm than good.
Do blackcurrants need a pollinator?
No. Blackcurrants are self-fertile, so a single bush will fruit. Planting two different varieties can give a slightly heavier crop and a longer picking season, but it is not required.
How long until a blackcurrant bush fruits?
A newly planted bush usually fruits lightly in its first year and reaches full cropping in two to three years. The data puts maturity at 365–730 days, which matches a bush settling in and fruiting properly from its second season.