Raised beds are best known for vegetables, but they are an excellent home for fruit too — especially the fruit that needs particular soil. Strawberries, raspberries, blueberries and currants all thrive in raised beds, and a raised bed solves the two problems that ruin more fruit plantings than any other: heavy, waterlogged soil and soil with the wrong pH. A bed you fill yourself is a bed you control, and for fruit that stays in place for years, that control is worth the effort of building it.
A raised bed for fruit is a different build from a raised bed for annual vegetables. Vegetables are replanted every year, so a shallow bed is fine; fruit is a perennial planting that will live in that bed for a decade or more, so the bed needs to be deeper, sturdier and filled with a soil mix that will still be good in five years' time. Strawberries need a bed at least eight to twelve inches deep, raspberries and currants want twelve to eighteen inches, and blueberries want eighteen inches or more of acidic soil. If you are planting a dwarf fruit tree in a raised bed, the bed is really a wide planting pit — build it at least three feet across and eighteen inches deep, and choose the tree for the space.
The other reason raised beds suit fruit is drainage and warmth. Raised soil drains faster and warms up earlier in spring than ground-level soil, which helps strawberries flower and ripen sooner and keeps raspberry roots out of standing water. In a wet climate that alone can be the difference between a healthy planting and one that rots. If you are unsure about a variety, a spray, or a diagnosis, check your local extension service — its advice is matched to your climate and soil.
Building a raised bed that lasts for fruit
Build with rot-resistant timber such as cedar, or with stone, brick or metal, and avoid treated timber that is not rated safe for food growing. A bed for strawberries can be four feet wide and as long as you like; for raspberries, keep it two to three feet wide so you can reach the canes from both sides without stepping in; for blueberries, build a bed at least three feet wide so the roots have room to spread. Fix the corners firmly — a bed full of wet soil pushes outwards with surprising force — and line the sides with landscape fabric if the timber is in contact with damp soil, leaving the bottom open so worms can come up and water can drain down. If your ground is heavy clay, fork the base before filling so the bed drains into the soil below rather than sitting on a sealed pan. The raised bed soil calculator can work out how much soil a bed needs, and the soil volume calculator does the same for any shape.
The right soil mix for raised-bed fruit
Fill a fruit bed with a mix of topsoil, compost and drainage material, roughly in equal parts, rather than pure compost, which slumps and dries out. Strawberries and raspberries want a rich, moisture-retentive but free-draining loam; add well-rotted manure or compost each autumn to keep it fertile. Blueberries are the exception and need their own bed: fill it with acidic compost and pine bark, keep it away from lime and alkaline tap water, and mulch with pine needles or bark. Currants and gooseberries are less fussy and will grow in ordinary good garden soil. Never use soil from elsewhere in the garden if it has grown potatoes or tomatoes recently, and do not plant raspberries where raspberries or other cane fruit grew before, because soil-borne diseases can carry over. Test the soil pH before planting — a simple test kit is cheap — because fixing pH after the plants are in is much harder than fixing it before.
Which fruit suits a raised bed best
Strawberries are the natural raised-bed fruit: they spread by runners, they fruit in year one, and a bed keeps the berries off the ground and easy to pick. Raspberries suit a narrow bed with a post-and-wire support along its length, and summer-fruiting types give a crop on last year's canes while autumn-fruiting types fruit on new canes you cut to the ground each winter. Blueberries suit a bed because you control the acidity, and a bed of three bushes of different varieties will pollinate each other and fruit for decades. Currants, gooseberries and blackberries also do well, though blackberries need a strong support and a watchful eye — they grow fast and will take over a bed if you let them. Dwarf apples and pears can be planted in a wide raised bed, but they are usually better in the ground or in a very large container, because a tree's roots will outgrow any bed within a few years. Grapes and melons can be grown at the edge of a bed and trained up or out, but they need more room than a bed usually gives.
Spacing, support and airflow in a raised bed
Fruit in a raised bed is easy to plant too closely, because a bed looks empty at planting time and full by midsummer. Give strawberries twelve to eighteen inches between plants, raspberries eighteen inches between canes in a row, blueberries four to five feet between bushes, and currants four feet between bushes. Raspberries need support from the start: set posts at each end of the bed and run two or three wires along it, tying the canes in as they grow. Strawberries need no support, but a straw mulch keeps the fruit clean and the soil moist. Airflow matters as much as spacing: a crowded bed stays damp, and damp fruit is diseased fruit, so thin raspberry canes to six or eight strong ones per foot of row, and prune out weak or crossing growth. Our plant spacing calculator can help you lay out a bed before you plant.
Watering and feeding raised-bed fruit
Raised beds dry out faster than the ground, so fruit in beds needs more regular watering than the same fruit planted at ground level — especially in the first year, and especially while fruit is swelling. Water deeply at the base of the plants, ideally in the morning, and mulch with straw, bark or compost to hold moisture in the soil. Drip irrigation or a soaker hose laid along the bed is the most efficient way to water fruit, because it puts water at the roots and keeps the leaves and fruit dry. Feed in spring with compost or well-rotted manure, and give fruiting plants a high-potash feed as the fruit swells — the fertiliser calculator can help you work out rates. Do not feed heavily in late summer, because soft new growth will not harden before winter. The watering calculator can help you set a routine for beds in your climate.
Long-term care: renewing a fruit bed
A fruit bed is not a plant-and-forget project. Strawberries fruit best for three or four years and should then be replaced with new plants in a fresh bed, because old plants build up disease and produce smaller fruit. Raspberries need annual pruning — summer types fruit on last year's canes, autumn types on new canes — and old canes must be cut out and removed, not left in the bed. Blueberries need yearly pruning of dead and crossing wood, and a spring mulch of acidic compost. Every autumn, clear fallen fruit and leaves from the bed, because they carry disease into the next season, and top up the soil level, which sinks as the compost breaks down. After several years, a bed's soil can become tired: if growth slows and fruit shrinks, lift the plants, refresh the soil with new compost, and replant. Keep a note of what grew where, and rotate strawberries to a new bed rather than replanting them in the same soil year after year.
Frequently asked questions
How deep should a raised bed be for fruit?
At least eight to twelve inches for strawberries, twelve to eighteen for raspberries and currants, and eighteen inches or more for blueberries. Deeper is always better for a perennial planting.
Can I grow a fruit tree in a raised bed?
A dwarf tree can be planted in a wide, deep raised bed, but its roots will outgrow the bed within a few years. Trees are usually better in the ground or in a very large container; beds suit berries, strawberries and currants best.
What soil should I put in a raised bed for blueberries?
Acidic compost and pine bark, with no lime and no alkaline tap water if you can avoid it. Blueberries need their own bed, separate from other fruit, so you can keep the pH low.
Do raised beds dry out faster than the ground?
Yes. Raised soil warms and drains faster, which is good for fruit, but it needs more regular watering in dry weather and a mulch to hold moisture in.
How long will strawberries last in a raised bed?
Strawberries fruit best for three to four years. Replace them with new plants in a fresh bed after that, and do not replant strawberries in the same soil straight away.
A raised bed is an investment in the soil your fruit will live in for years, so build it well and fill it well. Start with strawberries and a blueberry bed, learn how the bed behaves through a summer, and add raspberries or currants the next season. For the individual fruits, see the growing guides, including strawberries and blueberries, and check your planting calendar for timing in your zone.