Why do my strawberry plants have lots of leaves and no fruit?

Six causes in the order worth checking — plant age, nitrogen, frosted flowers, runners, shade and pollination — with the black-centred flower that identifies frost damage instantly.

Difficulty: beginner
Time: 25 min
Read: 4 min

Short answer

If the flowers open and then have black centres, that is frost. If there are few flowers but masses of leaf and runners, it is too much nitrogen or plants past three years old. If flowers set but fruit is misshapen, it is poor pollination. Feed high potash rather than general fertiliser, and replace plants on a three-year cycle.

Strawberries produce leaves, runners and fruit from the same limited budget, and the balance between them is easily pushed the wrong way. Nitrogen pushes it towards leaves. Age pushes it towards runners and away from fruit. And the flowers themselves, which open in April and May, sit right in the last of the frost season with the flower's most vulnerable part fully exposed.

Step by step

Look at the flowers first, at flowering time.A frosted strawberry flower has a distinct black centre with white petals still around it. It is unmistakable once you know it, and it explains a great many empty seasons.
Count the age of the plants.Yields fall sharply after the third year, and old plants put their energy into runners. If the bed has been the same plants for five years, that is the answer.
Check what you have been feeding.General fertiliser and lawn feed are nitrogen-led and produce large leafy plants with little fruit. Strawberries want a high-potash feed, such as tomato feed, from the time flowering starts.
Look at the runners.A plant putting out many runners during the fruiting season is spending its resources on those rather than on fruit. Cut them off through the cropping period and take them later.
Check the light.Strawberries need sun to produce and sweeten fruit. Plants shaded by a fence, a hedge that has grown, or their own overcrowded neighbours will flower less and taste of nothing.
Check the spacing and the crowding.A bed that has become a mat of self-rooted runners has far too many plants sharing the same water and light, and none of them fruit properly.
Consider pollination if the fruit is small and misshapen.Strawberries need every part of the flower pollinated to make an even berry. Cold wet weather at flowering, or plants under a permanently closed cloche or fleece with no insect access, gives lumpy, partly developed fruit.
Check the planting depth on newer plants.The crown must sit exactly at soil level. Buried crowns rot; crowns planted proud dry out. Both give weak, unproductive plants.
Rule out vine weevil on a plant that is failing entirely.If a plant wilts and comes away easily with almost no roots, tip it out and look for C-shaped white grubs. That is vine weevil, not a fruiting problem.

Tips

Fleece over the bed on a frosty night at flowering time saves the crop, provided it comes off in the morning so pollinators can get in.
Perpetual varieties fruit in smaller flushes across a longer season; summer-fruiting ones give one big crop. A plant that seems to be fruiting badly may simply be a perpetual variety behaving normally.
First-year plants planted in spring often crop poorly. Many growers remove the first year's flowers deliberately to build the plant, which is worth doing if you planted late.
Potted and basket strawberries need feeding weekly through the season — there is nothing left in the compost by midsummer.

Common mistakes

Feeding with a general or lawn fertiliser — Nitrogen produces enormous leafy plants with very little fruit. High potash is the strawberry feed.
Keeping the same plants indefinitely — Yield falls sharply after three years. A rolling replacement from your own runners costs nothing and doubles the crop of an old bed.
Letting runners root all over the bed — Overcrowding produces leaves and no fruit, and holds humidity around what fruit there is.
Leaving fleece on through flowering to protect from frost — No insects can reach the flowers, so pollination fails and the fruit is misshapen or absent. On at dusk, off in the morning.

If it doesn't work

Flowers with black centres

Cause: Frost damage at flowering — Fix: Fleece the bed on clear still nights in April and May, removing it each morning. Damaged flowers will not set.

Big leafy plants, few flowers, many runners

Cause: Too much nitrogen, or plants over three years old — Fix: Switch to a high-potash feed, remove runners during fruiting, and replace the oldest third of the bed.

Small, lumpy, partly developed fruit

Cause: Incomplete pollination — Fix: Ensure insects can reach the flowers, avoid permanent covers during flowering, and plant flowers nearby that attract pollinators.

Plants wilt and lift out with no roots

Cause: Vine weevil larvae — Fix: Remove affected plants, check the rest, and treat the bed or containers accordingly before replanting.

Plenty of flowers, fruit eaten before you get it

Cause: Birds or slugs, not a fruiting failure — Fix: Net properly with fine mesh, and get the fruit off the soil with straw or mats.

Questions people ask

Why do my strawberries flower but not fruit?

Most often frost — look for a black centre in the flower. Otherwise it is incomplete pollination, which gives small lumpy fruit rather than none at all.

How long do strawberry plants keep producing?

Three good years. After that the yield drops sharply and they put their energy into runners instead of fruit.

What should I feed strawberries?

A high-potash feed, such as a tomato feed, weekly from the start of flowering. Avoid general and lawn fertilisers, which are nitrogen-led and produce leaf at the expense of fruit.

Should I remove strawberry flowers in the first year?

On plants put in during spring, yes — removing the first flush builds a much stronger plant for the following year. Autumn-planted strawberries can be left to crop the next summer.