Borage repay a little planning around what grows beside them. Borage are a fast-growing annual covered in blue star-shaped flowers that bees adore, grown for a bee plant, a self-seeding filler, and a traditional companion that gardeners tuck into many beds. They need full sun, soil with a pH of 6.0–7.0, 12–18 inches of space and 50–60 days to reach maturity, so their neighbours need to suit the same bed and the same season. This guide lists the companions for borage from our crop data, how each one is thought to help, and which close relatives to keep apart.
There are 4 companions listed for borage here: Tomatoes, Peppers, Marigolds and Cabbage. 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. Borage are in the Boraginaceae family, need moderate water, and are sown direct where it is to grow; 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 borage
| Companion | Why it is grown with borage |
|---|---|
| Tomatoes | Borage at the tomato bed edge flowers for bees and is traditionally said to encourage tomato growth. |
| Peppers | Another heat-lover for the same sunny bed; its upright habit leaves room at its feet for low herbs. |
| 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. |
| Cabbage | A sturdy leafy neighbour; the herb's scent is traditionally said to help mask the cabbage from pests that hunt by smell. |
Tomatoes are the first companion to reach for with borage, and it is one of the classic companion plants itself — its flowers pull in pollinators that then visit everything around it. It is the tall neighbour that sets the shape of the bed: stake it well, keep the lower leaves clear, and plant the herb at its sunny base where it gets light without being shaded out.
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 aromatic herbs 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 — Marigolds — drawing pollinators and beneficial insects in. Let a few flower.
Nitrogen fixing. Nitrogen fixing does not apply here — none of the listed companions is a legume.
Ground cover and root layers. No companion here is a ground-cover plant, so mulch does that job instead. Deep roots beside shallow ones also 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 borage
The plants to keep away from borage are its own relatives — but borage have none in our crop data. Borage belong to the Boraginaceae 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 borage 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
Direct sow and thin to 12–18 inches; borage reaches maturity in 50–60 days and self-seeds, so deadhead if you do not want it everywhere.
Give borage their full spacing of 12–18 inches between plants. Crowded borage 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 borage; scented herbs go closest to the crop, dotted through the row.
Borage are sown direct where it is to grow: sow under cover where needed, expect germination in 7–14 days, and set plants out once the weather is right. Work backwards from your last frost date with the seed-starting calculator. Borage need full sun and soil with a pH of 6.0–7.0. 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 50–60 days from sowing to maturity.
Common problems and fixes
The pests most often reported on borage 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 Boraginaceae family next year.
Frequently asked questions
What is the best companion plant for borage?
The most widely recommended companions are tomatoes. Borage at the tomato bed edge flowers for bees and is traditionally said to encourage tomato growth.
What should not be planted near borage?
No other crop in our data shares the Boraginaceae family with borage, so there is no same-family neighbour to avoid. The thing to avoid is replanting borage in the same spot year after year, which lets its pests build up in the soil.
Can I plant borage with peppers?
Yes. Peppers are on the companion list for borage. Another heat-lover for the same sunny bed; its upright habit leaves room at its feet for low herbs.
How far apart should borage and their companions be planted?
Space borage plants 12–18 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.