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How to use horse manure on beds and borders

Updated: October 2026

You have a bag or heap of rotted material beside the bed, but the advice alternates between kilograms, buckets and centimetres. To understand how to use horse manure, first choose one of two jobs: dig it in as a soil improver, or leave it on the surface as a mulch. For digging in, a practical RHS range is about 5–10 kg per square metre. For mulching, use a layer at least 5 cm deep and commonly 5–8 cm. This page is the method. The boxes in the [horse manure comparison](/hub/fertiliser-soil-and-bark-mulch/horse-manure) are rose-food products, not bulk manure for these rates.

You have a bag or heap of rotted material beside the bed, but the advice alternates between kilograms, buckets and centimetres.

Our top picks

Westland Westland horse-manure rose food, 2 × 3 kg

Best overall

Westland Westland horse-manure rose food, 2 × 3 kg
9.2/10about £21.10
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Topline Topline rose food, 2 × 3 kg

Preis-Tipp

Topline Topline rose food, 2 × 3 kg
9.2/10about £19.99
View offer
Westland Westland bone meal and horse-manure rose food bundle

Alternative

Westland Westland bone meal and horse-manure rose food bundle
1.0/10about £27.54
View offer
On this page
  1. 1.Two jobs, two different rates
  2. 2.When to spread it in the UK
  3. 3.How to put it on
  4. 4.Where the rose-food boxes fit

Two jobs, two different rates

Use about 5–10 kg per square metre when you dig in well-rotted horse manure. The RHS also describes this as roughly half to one 15-litre bucket per square metre. Wet manure weighs more than dry compost, so weigh one bucket if you need a repeatable rate. On a 4 m² bed that is about 20–40 kg. For a mulch, think in depth. BBC Gardeners' World recommends 5–8 cm. The RHS advises at least 5 cm and ideally around 7.5 cm. Five centimetres is roughly 50 litres per square metre. A 6 kg rose-food box cannot do this job. If the heap is fresh, pale, warm or full of bedding, use fresh or rotted horse manure before you apply a rate.

When to spread it in the UK

Autumn suits a bare vegetable bed. Spread well-rotted manure after the crops finish, and let worms and winter weather draw it into the upper soil. For a mulch, the RHS commonly points to November–February, on soil that is damp but not frozen or waterlogged. Do not work a bed that is squelchy enough to compact. February–March can suit established plants if the ground is workable and you keep manure off stems and crowns. On a seed bed, dig it in before sowing and let the surface settle. Late summer is a poor default, because soluble nutrients may wash off bare ground before a crop uses them. Freshly manured soil can fork carrots and parsnips. An unknown herbicide history is a separate risk, in horse manure for vegetables.
Westland Westland horse-manure rose food, 2 × 3 kg

Testsieger

Westland Westland horse-manure rose food, 2 × 3 kg
9.2/10about £21.10
View offer

How to put it on

Clear perennial weeds and water dry soil first. Break clumps with a manure fork and spread to the depth you chose, not in mounds. Leave a clear ring at stems and crowns. Manure banked against living tissue holds moisture and can cause damage. If you are digging it in, mark one square metre. Weigh a bucket, spread enough to reach roughly 5–10 kg, and fork it through the upper soil rather than burying one thick layer. If the filled bucket weighs 7 kg after you subtract the empty bucket, one bucket per square metre sits in the range. If you are mulching, measure the depth in several places. Five centimetres over one square metre is about 50 litres. Do not cover stems, low leaves or herbaceous crowns. Wear gloves, do not eat while you handle manure, and wash afterwards. Clean the tools. That is ordinary hygiene for animal manure.

Where the rose-food boxes fit

The Amazon products in the comparison are concentrated feeds: two 6 kg rose-food packs and a bone-meal bundle. Those kilograms are not the 5–10 kg per square metre soil-improver rate. Follow the printed instructions around the named plants. The horse manure buying guide separates those boxes from manure sold by the litre. Before you spread stable material on potatoes, tomatoes or beans, ask about pasture, hay and silage treatments. Dark and crumbly shows decomposition. It does not prove a hormone weedkiller residue is absent. If several allotment plots show distorted growth, stop using the shared heap and ask the site manager.

Common questions

How many kilograms of horse manure should I use per square metre?
For well-rotted organic matter dug in as a soil improver, the RHS gives about 5–10 kg per square metre. The range is not a fertiliser prescription for every soil. Start at the lower end on ground that is already fertile, and remember that wet manure weighs more than drier compost.
How deep should horse-manure mulch be?
Apply well-rotted material at least 5 cm deep. A useful working range is 5–8 cm, with about 7.5 cm often recommended. At 5 cm, allow roughly 50 litres per square metre. Keep the mulch clear of stems, crowns and low foliage.
When should I spread it?
Autumn suits bare vegetable beds, while November–February is a common mulch window on damp, workable ground. Early spring can suit established plants. Avoid frozen or waterlogged soil, and avoid late-summer spreading unless you have a clear need, because nutrients may be lost before a crop uses them.
Is one bucket a reliable rate?
Only after you weigh it. A 15-litre bucket of wet manure may be much heavier than the same bucket of drier, straw-rich material. Fill it the same way each time, weigh the contents once, and calculate how many buckets supply your chosen kilograms per square metre.
Can manure touch plant stems?
No. Leave a gap around stems, trunks and plant crowns. A thick, wet layer held against living tissue can encourage rot or other damage. Spread it evenly over the surrounding root area instead of piling it against the plant.
What should I do with fresh manure?
Put fresh horse manure on a compost heap, or reserve it for ground that will stay uncropped long enough for it to break down. Do not place it against growing plants. Allow at least six months in general, and about a year where the bedding is wood shavings.

Related pages

Best horse manure

Horse manure

Horse manure buying guide: what to check before paying

Fresh or rotted horse manure: six months or a year

Horse manure for vegetables: residues and safe crops

Sources

Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the three amazon.co.uk listings captured on 20 October 2026. None of those tables prints an NPK. A handful rate on a maker page is not an amazon.co.uk line. A missing star line is not a zero-star product. This is not a laboratory test.

  1. BBC Gardeners' World, horse manure (retrieved 20 October 2026)
  2. RHS, organic matter: how to use (retrieved 20 October 2026)
  3. RHS, how to mulch (retrieved 20 October 2026)
  4. RHS, weedkiller in manure (retrieved 20 October 2026)
  5. HSE, aminopyralid in manure (retrieved 20 October 2026)
  6. GOV.UK, storing organic manures in nitrate vulnerable zones (retrieved 20 October 2026)
  7. Nitrate Pollution Prevention Regulations 2015, regulation 23 (retrieved 20 October 2026)
  8. Garden Health, Westland rose food (retrieved 20 October 2026)