Blackcurrants repay a little planning around what grows beside them. Blackcurrants are a hardy fruit bush grown for dark, sharp berries. They need full sun, soil with a pH of 6.0–6.5, 48–60 inches of space and 1–2 years to reach maturity, so their neighbours need to suit the same bed and the same season. This guide lists the companions for blackcurrants from our crop data, how each one is thought to help, and which close relatives to keep apart.
There are 4 companions listed for blackcurrants here: Borage, Marigolds, Clover and Chives. Companion planting is traditional garden practice rather than proven science, so benefits below are described in those terms — what gardeners have long said and done. Blackcurrants are in the Grossulariaceae family, need moderate water, and are planted as young plants in their permanent spot, not sown as seed in the bed. They are hardy, so choose the site with that in mind — a sheltered, sunny spot for tender kinds, and open ground where hardy kinds can take winter cold. Give them time: they are a long-term planting, not a one-season crop. Check any pairing first with the companion-planting finder.
Best companion plants for blackcurrants
| Companion | Why it is grown with blackcurrants |
|---|---|
| Borage | Its blue flowers draw pollinators and beneficial insects, and it is traditionally said to help neighbouring plants grow. |
| Marigolds | Grown as a border or dotted through the bed; its roots are traditionally said to discourage some soil pests, and its flowers attract beneficial insects. |
| Clover | A legume ground cover that fixes nitrogen in the soil and keeps bare ground covered. |
| Chives | A small, clumping herb for the bed edge; its onion scent is traditionally said to confuse pests. |
Borage is the first companion to reach for with blackcurrants. Its flowers bring in pollinators and beneficial insects, which matters for any plant that needs visiting insects to set well. Sow or plant it at the bed edge where it can flower freely without crowding the main crop, and leave some plants to self-seed for next year.
How companion planting works
Companion planting works through four overlapping mechanisms.
Pest confusion. Many pests find their host plant by scent. Strong-smelling companions such as Marigolds, Chives are traditionally said to mask that scent, so the pest passes by. It is a delaying effect, not a barrier.
Pollinator and beneficial-insect attraction. Several companions here flower — Borage, Marigolds, Clover — drawing pollinators and beneficial insects in. Let a few flower, and leave some blooms standing rather than deadheading everything.
Nitrogen fixing. Clover is a legume — they fix nitrogen from the air into the soil, feeding the bed as they grow. Dig the spent plants into the soil at the end of the season to keep the benefit in the bed.
Ground cover and root layers. Clover covers bare soil, holding moisture in and keeping weeds down, while deep roots beside shallow ones compete less for water and nutrients.
None of this replaces the basics. Spacing, watering, rotation and weekly inspection matter more than any pairing.
Plants to avoid near blackcurrants
The plants to keep away from blackcurrants are its own relatives. Blackcurrants belong to the Grossulariaceae family, and plants in the same family share the same pests and diseases — here, aphids, slugs and cutworms — so problems pass easily between them and build up in the soil.
| Plant to avoid | Why |
|---|---|
| Gooseberries | Same Grossulariaceae family; shares pests such as aphids, slugs and cutworms. |
Keep these relatives in a different bed and rotate the Grossulariaceae family to fresh ground each year. If you are unsure whether a plant is a relative, check your local extension service before planting it beside blackcurrants.
Planting layout and spacing
One plant needs 48–60 inches and a spot that suits its needs; once it is planted, it stays put, so choose the site carefully.
Give blackcurrants their full spacing of 48–60 inches between plants. Crowded blackcurrants mean poor airflow, more disease and smaller harvests, and no companion plant compensates for it. Work out how many plants fit your bed with the plant-spacing calculator or the square-foot garden planner.
Plant companions in the spaces the spacing leaves, not instead of it. Low companions go around the base of the bush and along the bed edges; taller ones go at the north side so they do not shade the bush; scented herbs go closest to the plant, dotted through the row. Keep a mulched ring around the base clear of grass.
Blackcurrants need full sun and soil with a pH of 6.0–6.5. Water needs are moderate, so keep the soil consistently moist with deep, regular watering rather than a light daily sprinkle, and mulch thickly to hold moisture in. The watering calculator gives a starting point for your bed size. Expect the first real crop in roughly 1–2 years from planting, and a bigger harvest once the plant is established. If growth is poor despite good care, check your local extension service for advice specific to your area and soil.
Common problems and fixes
The pests most often reported on blackcurrants are aphids, slugs and cutworms. Companions may reduce pressure, but they do not prevent them — inspect leaf undersides and new growth weekly and act while numbers are low.
| Problem | What you see | First fix |
|---|---|---|
| Aphids | Sap-sucking insects on new growth; leaves curl. | Wash off with water; encourage ladybirds. |
| Slugs | Chewed leaves and silvery trails, worst in damp weather. | Beer traps or copper tape; clear debris. |
| Cutworms | Caterpillars that fell seedlings by chewing stems at soil level. | Cardboard collar around each young stem. |
Aphids
Wash them off with a strong jet of water and leave ladybirds and lacewings alone to eat them. Check the undersides of young leaves, where colonies start.
Slugs
Slugs feed at night in damp weather. Clear boards, pots and debris where they hide by day, and set beer traps at soil level near the worst-hit plants.
Cutworms
Push a cardboard collar an inch into the soil around each young stem. Check beds at night with a torch when seedlings start falling.
Unsure what you are seeing? Try the pest-identifier helper or the plant-disease checker. Remove badly affected leaves and rotate the Grossulariaceae family next year.
Frequently asked questions
What is the best companion plant for blackcurrants?
The most widely recommended companions are borage. Its blue flowers draw pollinators and beneficial insects, and it is traditionally said to help neighbouring plants grow.
What should not be planted near blackcurrants?
Avoid other members of the Grossulariaceae family, including Gooseberries. They share the same pests and diseases as blackcurrants, so problems move easily between them. Rotate the family to a fresh bed each season.
Can I plant blackcurrants with marigolds?
Yes. Marigolds is on the companion list for blackcurrants. Grown as a border or dotted through the bed; its roots are traditionally said to discourage some soil pests, and its flowers attract beneficial insects.
How far apart should blackcurrants and their companions be planted?
Space blackcurrants plants 48–60 inches apart, and put companions in the gaps, along the edges and at the ends of rows. The seed-spacing calculator and the plant-spacing calculator work out how many plants fit your bed.
Does companion planting replace pest control?
No. It may reduce pest pressure, but it does not replace inspection, spacing, watering, rotation and good airflow. Check plants weekly and act early, and check your local extension service for advice on pest problems that keep coming back in your area.