Blueberries repay a little planning around what grows beside them. Blueberries are a long-lived acid-loving shrub that fruits for decades once established, grown for fresh eating, freezing and a handsome shrub for the fruit garden. They need full sun, soil with a pH of 4.5–5.5, 48–60 inches of space and 365–1095 days to reach maturity, so their neighbours need to suit the same bed and the same season. This guide lists the companions for blueberries from our crop data, how each one is thought to help, and which close relatives to keep apart.
There are 4 companions listed for blueberries 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. Blueberries are in the Ericaceae family, need moderate water, and are started indoors or sown direct; they are hardy and tolerate cold, so they can go out early in the season. Check any pairing first with the companion-planting finder.
Best companion plants for blueberries
| Companion | Why it is grown with blueberries |
|---|---|
| Borage | Its star-shaped blue flowers are a magnet for bees and other pollinators, and its leaves are traditionally said to encourage the growth of neighbours. |
| 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 low living mulch that covers bare soil, keeps moisture in, and — as a legume — fixes nitrogen from the air into the soil. |
| Chives | Chives at the bush edge take little room and their scent is traditionally said to confuse pests; they tolerate the same moist soil. |
Borage is the first companion to reach for with blueberries, and their acid soil (pH 4.5–5.5) is the deciding factor — companions must be happy in the same bed without changing that acidity. Sow it direct at the edge of the bed and let it flower — the blue stars bring bees in from all over the garden, and those bees then visit everything around it. It self-seeds, so deadhead a few plants if you do not want it everywhere 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 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, Chives — drawing pollinators and beneficial insects in. Let a few flower.
Nitrogen fixing. Nitrogen fixing applies here: clover is a legume, and legumes host bacteria on their roots that pull nitrogen from the air into the soil. This is the one companion-planting benefit with solid science behind it.
Ground cover and root layers. Ground cover does apply: clover spreads as a living mulch, shading the soil and holding moisture in.
None of this replaces the basics. Spacing, watering, rotation and weekly inspection matter more than any pairing.
Plants to avoid near blueberries
The plants to keep away from blueberries are its own relatives — but blueberries have none in our crop data. Blueberries belong to the Ericaceae family, and no other crop in our 120-crop data set shares that family, so there is no same-family neighbour to avoid on that basis.
That does not mean anything goes. The rule that still matters is rotation: do not plant blueberries in the same spot year after year, because the pests that bother them — aphids, slugs, cutworms — build up in the soil and on old plant debris. Move them to a fresh bed each season and clear old stems at the end of the year.
Planting layout and spacing
Space bushes 48–60 inches apart and keep them mulched with pine needles or bark; they take 365–1095 days to reach full maturity, so patience pays.
Give blueberries their full spacing of 48–60 inches between plants. Crowded blueberries 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 in the gaps and along the bed edges; taller ones go at the north side so they do not shade the blueberries; scented herbs go closest to the crop, dotted through the row.
Blueberries are started indoors or sown direct: sow under cover where needed, expect germination in 30–90 days, and set plants out once the weather is right. Work backwards from your last frost date with the seed-starting calculator. Blueberries need full sun and soil with a pH of 4.5–5.5. 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 365–1095 days from sowing to maturity.
Common problems and fixes
The pests most often reported on blueberries are aphids, slugs, 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 Ericaceae family next year.
Frequently asked questions
What is the best companion plant for blueberries?
The most widely recommended companion is borage. Its star-shaped blue flowers are a magnet for bees and other pollinators, and its leaves are traditionally said to encourage the growth of neighbours.
What should not be planted near blueberries?
No other crop in our data shares the Ericaceae family with blueberries, so there is no same-family neighbour to avoid. The thing to avoid is replanting blueberries in the same spot year after year, which lets its pests build up in the soil.
Can I plant blueberries with marigolds?
Yes. Marigolds are on the companion list for blueberries. 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 blueberries and their companions be planted?
Space blueberries plants 48–60 inches apart, and put companions in the gaps, along the edges and at the ends of rows. The plant-spacing calculator works 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.