Raised bed height for vegetables
Updated: October 2026
Most galvanised kits on amazon.co.uk are 30 cm tall, and you may have wanted something deeper for carrots or a bush. Raised bed height for vegetables is that choice, plus the width you can reach without standing in the soil. On open ground the wall is only the upper part of the root run. On tarmac it is the entire run. Prices for the ten kits are on the [metal raised bed comparison](/hub/raised-beds-greenhouses-and-compost/raised-bed-metal). Peter F. set the bands from RHS guidance and the listing heights. A qualifying purchase can earn a commission at no extra cost to you.
Most galvanised kits on amazon.co.uk are 30 cm tall, and you may have wanted something deeper for carrots or a bush.
Most galvanised kits on amazon.co.uk are 30 cm tall, and you may have wanted something deeper for carrots or a bush. Raised bed height for vegetables is that choice, plus the width you can reach without standing in the soil. On open ground the wall is only the upper part of the root run. On tarmac it is the entire run. Prices for the ten kits are on the metal raised bed comparison. Peter F. set the bands from RHS guidance and the listing heights. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Wall | Width | Soil litres | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Harbour Housewares Harbour Housewares 180 cm | 30 cm | 90 cm | 486 l | 8.4 | about £30.99 | View offer |
| Best value |  VIREO GARDEN VIREO GARDEN round pair | 30 cm | 120 cm round | About 340 l a ring | 6.8 | about £30.63 | View offer |
| Alternative |  HEALSTOK HEALSTOK 43 cm pair | About 43 cm | 60 cm | 319.8 l, one bed | 6.3 | about £52.05 | View offer |
On this page
What depth the crops are asking for
The RHS separates two bands. About 30 cm suits salads and strawberries. About 45 cm or more suits most fruit bushes and small trees. On soil, that assumes roots can leave an open frame. A 30 cm kit on the lawn still has ground underneath. The same kit on slabs is a 30 cm container.
The Raised Bed Company talks about 45 cm for mixed planting. When that seller band and the RHS split disagree, we follow the RHS. None of this promises a yield from a particular listing.
Width, and how far you can reach
The RHS keeps beds under about 1.5 m. Which? often cites about 1.2 m. Thrive’s accessible-bed guidance is about 1,000 mm from both sides and about 500 mm from one side. A 90 cm bed suits two-sided work. A 60 cm bed matches one-sided reach. A 120 cm round fails the one-sided test.
One Ergohortus reviewer who uses a wheelchair planted a 30 cm oval from the chair. That is one account, not a measured seat height.
Patios, tarmac, and anywhere the soil stops
On hard standing, nothing useful sits below the wall. The RHS schools sheet wants at least 50 cm there. This set has no 50 cm kit. One HEALSTOK pair is about 43 cm, listed as 4 × 2 × 1.4 ft, which still misses 50 cm on tarmac.
A 30 cm metal bed on a patio is a large container for salads, herbs, and flowers. An open bottom on tarmac drains onto the surface. A drainage gap does not add the missing centimetres.
What height the kits in this comparison actually are
Almost every kept listing is a 30 cm wall, including both Harbour sizes, VIREO’s rounds, and the soil box of the KING BIRD trellis bed. The KING BIRD title height of 180 cm is the trellis. The growing bullet is 180 × 90 × 30 cm. Using 180 cm as root depth is the same mistake as using 2,916 litres as a compost order.
The exception is the HEALSTOK pair at about 43 cm and 319.8 litres for one bed, on 4.2 from 30 reviews, with a UK complaint that the struts were too short. Measure the centimetres, not the shape field.
Stacking, kneeling, and the litre consequence
Stacking two 30 cm kits is a modification the listing did not test. We would not call a stacked pair a 60 cm product. A 30 cm wall is a kneeling height.
A 120 × 60 cm bed at 30 cm is 216 litres. The same footprint at 43 cm is about 310 litres. Do that sum on how to fill a metal raised bed before you order a second carton. If the listing cannot be reconciled, the galvanised raised bed buying guide treats that clash under the description rules.
Common questions
Is 30 cm deep enough for tomatoes?
On open soil, many gardeners grow tomatoes in a 30 cm open-bottom bed because the roots continue downwards. That matches how these kits are built. On tarmac, 30 cm is the whole volume, and the RHS schools figure of at least 50 cm is the one to take seriously. A tomato in a 30 cm patio ring is a container plant. Water and feed it as one.
When do you need 45 cm?
Use the RHS split for a fruit bush or a small tree, and when you want the deeper band sellers quote for mixed planting. The HEALSTOK pair at about 43 cm is the only plain kit here in that region. It still does not give you 50 cm on hard standing. Salads and strawberries are the RHS case for staying at 30 cm, which is where most of these galvanised kits already sit.
How wide a bed can you reach across?
Use under 1.5 m if you follow the RHS, and about 1.2 m if you follow the Which? rule of thumb. For one-sided or seated work, Thrive’s about 500 mm from one side and about 1,000 mm from both sides is the stricter guide. A 60 cm metal bed fits one-sided reach. A 90 cm bed fits two-sided reach. A 120 cm round needs a path all the way around it.
How high should a raised bed be on a patio?
At least 50 cm if you follow the RHS schools guidance for tarmac, because there is no soil underneath. The 30 cm kits here do not meet that, and the 43 cm pair does not either. Use 30 cm on a patio for shallow crops, or put the bed on soil. Compost heaped above the rim is not a stable way to invent depth, and it spills.
What height works from a wheelchair?
Reach matters as much as the wall. Thrive’s accessible widths are the published figures we can cite, and a 60 cm bed is the one here that fits one-sided reach. A wheelchair user did garden in a 30 cm Ergohortus oval. That review is not a measured seat height, and it does not make the wall a specified accessible product. Mock the rim with cardboard if your chair needs a set arm position.
Does a taller wall change how much compost you need?
Yes. Litres follow length times width times soil depth. Moving a 120 × 60 cm bed from 30 cm to 43 cm adds roughly 90 litres, into the low 300s for one bed, and a twin pack doubles it. Keep the trellis kit’s overall height out of that sum. Use the soil bullet, then the fill page, and order the bags from the centimetres you will actually fill.
Related pages
Sources
Public UK sources from the research digest, last checked on 20 October 2026.
- RHS — How to make a raised bed (retrieved 20.10.2026)
- RHS — No-dig gardening (retrieved 20.10.2026)
- RHS — Creating raised beds (schools) (retrieved 20.10.2026)
- Which? — How to build raised garden beds (retrieved 20.10.2026)
- Thrive — How to build raised beds (PDF) (retrieved 20.10.2026)
- Galvanizers Association — EN ISO 1461 (retrieved 20.10.2026)
- legislation.gov.uk — Consumer Rights Act 2015, section 11 (retrieved 20.10.2026)
- Planning Portal — Outbuildings (retrieved 20.10.2026)