In short: Strawberries in pots, troughs, hanging baskets and grow bags want a medium that drains freely but never dries out, is slightly acid to neutral, and is fed little and often. That is why UK commercial growers moved strawberries out of the soil and into coco coir. For home growers the practical recipe is 50% coco coir, 30% peat-free compost and 20% perlite, with a liquid feed every fortnight and a switch to a high-potassium feed when the first flower buds show. Strawberries do not need ericaceous compost.
What strawberries need from a compost
The Royal Horticultural Society (RHS) guide is relaxed about containers: strawberries are easy to grow in pots, growing bags, hanging baskets, troughs and tubs, filled with peat-free multi-purpose or soil-based compost, planted with the crown level with the surface and spaced about 20 cm apart in a sheltered, sunny spot with regular watering. That is the baseline, and it works. Four things separate a good crop from a mediocre one in a container:
- Even moisture. Strawberries are shallow-rooted, and a pot that dries out while the fruit is swelling gives small, seedy berries. A hanging basket in June can lose most of its water in a day.
- Air at the roots. A waterlogged or slumped compost rots crowns and invites grey mould. Free drainage matters as much as water-holding.
- The right pH. Strawberries prefer slightly acid to neutral conditions. They are not lime-haters: ericaceous compost is unnecessary and its low pH is not what they want.
- Steady feeding. The RHS advises feeding container strawberries fortnightly through the growing season — a general-purpose liquid feed first, then a high-potassium liquid feed once the first flower buds form.
Why coir — what the professionals do
Most UK-grown strawberries are no longer grown in soil. Commercial growers raise them in bags of coir substrate on table-top systems under polytunnels, because coir gives them exactly the balance above: it holds 8–10 times its own weight in water while keeping 20–30% air space, it starts at a strawberry-friendly pH of 5.5–6.5, and it carries no disease from previous crops. Coir substrate suppliers publish strawberry guides for that industry; the home-garden version is simpler, because you are not running a drip line and a feed computer — you are adding compost to give the plants a buffer of food between feeds.
Our coir is washed to a low salt level and calcium-buffered — the two things that matter with a fruit crop, because raw unwashed coir can hold back calcium and potassium from the plant in its first weeks.
The best compost for strawberries in pots — the recipe
| Ingredient | Share | Why |
|---|---|---|
| Coco coir (expanded brick) | 50% | Water-holding without waterlogging; stays open all season; slightly acidic; peat-free. |
| Peat-free multi-purpose compost (or sieved garden compost) | 30% | Nutrients and biology to carry the plant between liquid feeds. |
| Perlite (or horticultural grit for a heavier, more stable pot) | 20% | Drainage and air — insurance against a wet May. |
| Slow-release or organic granular fertiliser | Pack rate, mixed through | Base feed; the fortnightly liquid feed does the rest. |
For a long-lived planting in a large tub, add a fifth part of loam-based (John Innes type, peat-free) compost: the RHS notes soil-based composts last three to four years in a pot without needing replacement, which suits a crop you keep for two or three seasons.
How much you need
| Container | Volume of mix | Coir share (50%) | Plants (20 cm apart) |
|---|---|---|---|
| 25–30 cm pot | ≈ 8–10 L | ≈ 4–5 L | 2–3 |
| 35 cm hanging basket | ≈ 10 L | ≈ 5 L | 3–4 around the edge |
| 80 cm trough or window box | ≈ 25 L | ≈ 12 L | 4–5 |
| Grow bag (home-made, 40 L) | ≈ 35 L | ≈ 18 L | 6–8 |
| One 5 kg brick (≈ 75 L) | Makes ≈ 150 L of the 50:30:20 mix — about fifteen 30 cm pots or baskets, or four grow bags. | ||
Which container?
The RHS makes one point that surprises people: the traditional strawberry pot with planting pockets up the sides looks the part but can make it difficult to keep the plants healthy and productive — the top dries out while the bottom stays wet, and the pocket plants get the least water. Ordinary wide pots, troughs and hanging baskets are easier. Hanging baskets have a bonus: the fruit hangs clear of slugs and soil, and the RHS lists strawberries among suitable basket plants. Perpetual (everbearing) varieties suit baskets best because they crop in small flushes from summer into autumn rather than in one heavy fortnight.
Planting and the season
- When to plant. Pot-grown plants can be planted from spring; late summer to early autumn planting gives the strongest crop the following June, because the plants establish before winter. Cold-stored runners sold in spring crop in their first summer.
- Depth. Crown level with the surface — the RHS warning is that planting too deep rots the crown and too shallow dries the plant out.
- Position. Sheltered and sunny. For an earlier crop the RHS suggests moving potted plants into an unheated greenhouse or cold frame in February; they fruit a couple of weeks ahead of outdoor plants.
- Watering. Regularly, and daily in hot weather for baskets — lift the basket to judge its weight. Water the compost, not the fruit, so it stays dry and clean.
- Feeding. Fortnightly liquid feed once growth starts; switch to a high-potassium feed — a tomato feed is exactly that — when the first flower buds form.
- Straw and netting. Pots do not need the straw mulch a bed does. Net the fruit from birds as it colours.
- After fruiting. Cut off old leaves and unwanted runners; keep the plants watered; in year three, replace them with rooted runners in fresh mix.
Growing strawberries in coco coir alone
You can grow strawberries in pure coir, which is what the industry does — but the industry feeds a complete nutrient solution at almost every watering, because coir itself contains almost nothing. If you want to copy it at home, use a balanced liquid feed diluted to a weak rate at every watering from planting, water until a little runs out of the base, and move to a high-potassium feed at flowering. For most gardeners the 50:30:20 mix is less work and more forgiving, because the compost share holds nutrients between feeds. Whichever you choose, do not let coir dry out completely with fruit on the plant. For varieties, calcium and magnesium feeding and overwintering in coir, see our coco coir for strawberries growers' guide.
Problems in pots — and the fixes
| Problem | Usual cause | Fix |
|---|---|---|
| Small, seedy fruit | Dry spells while fruit was swelling; too many plants per pot | Even moisture from flowering; 20 cm spacing; fortnightly feed |
| Grey furry mould on fruit (botrytis) | Wet fruit, still air | Water the compost not the plant; space plants; remove affected fruit promptly |
| Lots of leaf, few flowers | Too much nitrogen | Switch to a high-potassium feed at bud stage; do not over-feed with general fertiliser |
| Plants wilting despite watering; notched leaf edges | Vine weevil grubs eating roots — common in pots | Tip out and check the roots in autumn; use a biological nematode control; fresh mix for replacements |
| Yellowing between the veins | Nutrient lock-up, often from unbuffered coir or hard tap water | Use buffered coir; feed with a complete liquid feed that includes trace elements |
| Crown rot, plant collapses | Planted too deep or waterlogged | Crown at surface level; the 20% perlite; check drainage holes |
Frequently asked questions
What is the best soil mix for growing strawberries in pots?
50% coco coir, 30% peat-free compost, 20% perlite, plus a slow-release fertiliser at the pack rate. It drains, holds water, sits at the right pH and is light enough to move.
Do strawberries need ericaceous compost?
No. Strawberries prefer slightly acid to neutral conditions, not the strongly acid compost sold for blueberries, rhododendrons and camellias. Coir's natural pH of 5.5–6.5 suits them — see is coco coir acidic?
Can I use tomato feed for strawberries?
Yes. Tomato feed is a high-potassium liquid feed, which is what the RHS recommends from the first flower buds onward. Use a general-purpose feed before that.
What helps strawberries grow bigger?
Fewer plants per container, no dry spells from flowering to picking, a high-potassium feed at bud stage, and removing runners so the plant's energy goes into fruit.
Can strawberries grow in a hanging basket?
Yes — three or four plants around a 35 cm basket, a perpetual variety for a long season, and daily watering in summer. See how to plant a hanging basket that stays moist.
Can I grow strawberries in just coco coir?
Yes, with a complete liquid feed at nearly every watering, as commercial growers do. The 50:30:20 mix is easier for a patio.
How long do strawberry plants last in pots?
Two to three good seasons. Root a few runners each summer into small pots of the same mix and replace the parents in year three.
One washed, calcium-buffered 5 kg brick — about 75 litres of coir, enough for fifteen pots or baskets of strawberries, delivered free across the UK.
Shop the 5 kg brick → All crop mix ratiosRelated reading
- How to plant a hanging basket that stays moist all summer
- Growing potatoes in bags: the UK step-by-step guide
- Coco coir for strawberries: varieties, feeding and overwintering (growers' guide)
- Coco coir for tomatoes
- Best plants to grow in coco coir
- What can you use coco coir for? 30+ uses for one brick