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GardenCalc.uk · Free UK Field Guide 02

The Raised Bed & Border Soil Recipe Card

What to fill it with, in what mix — so things actually grow.

The raised-bed fill (for veg)

60–70%
Quality topsoil
screened / blended — not cheap "fill"
30–40%
Compost / soil improver
holds water + feeds the bed

This topsoil-led mix is the reliable starting point for a veg bed — the same ratio our compost calculator uses. Add a couple of handfuls of grit per barrow if drainage is poor.

Other jobs

The jobDo this
Improving a borderFork 5–10cm of compost into the top of the existing soil — don't replace it
Pots & containersMultipurpose + John Innes + a handful of grit for drainage
Mediterranean / alpine plantsUp the grit — they rot in rich, wet soil

How much?

The £-saver
Don't buy cheap unscreened "fill" topsoil to grow in — it's full of stones and weed seed. One good blended bulk bag beats three cheap ones you'll fight all season.
📐 Your exact soil amount in 10 seconds gardencalc.uk/topsoil-calculator
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