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Product guide

Hardys Mature Plant Compost, 25L, John Innes No.3

Hardys Mature Plant Compost is a 25-litre John Innes No.3 mix presented for established plants in pots and containers. Its loam-based composition and claimed slow-release feed make it suited to nutrient-demanding mature plants, while the listing also describes indoor and outdoor uses.

At a glance

  • The listing positions this loam-based compost for mature, established plants in pots, tubs, window boxes and flower beds.
  • The claimed composition includes horticultural grit and a water-activated slow-release feed lasting four months.
  • The listed uses cover both houseplants and outdoor plants, with examples including shrubs, fruit bushes, climbers and trees.
Price
£11.39Save 24%

Reference price: £14.99

Price checked: 12 Nov 2026

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Often bought together

Pros and cons

Pros

  • Its stated John Innes No.3 formulation targets established plants with higher nutrient needs.
  • Indoor and outdoor use claims give it flexibility for mature container plants around the home and garden.

Technical specifications

9 specifications
Identity
BrandHardys
ModelAFRA-HG-HOM-0295
Size and weight
Volume25 Litres
Weight listed11 Kilograms
Composition and use
Compost typeMature Plant Compost
FormulaJohn Innes No.3
Base and ingredientsA soil loam base is filled with rich organic matter, horticultural grit substrate, John Innes No.3 infused nutrients, and a water activated slow release 4 month feed.
StyleClassic
Country of originIreland

What to know before buying

  • The product name and description consistently identify a 25L John Innes No.3 mature-plant mix, but the listing also calls it multi-purpose and seed compost without explaining whether those are equally suitable uses. The slow-release feed duration is a stated claim, not an independent performance result.

Who is it for?

A good fit for

  • Gardeners repotting established houseplants or other mature container plants.
  • Buyers seeking one listed compost for mature plants in indoor pots and outdoor containers.

Less suited to

  • Buyers who need a compost specifically formulated for seeds or seedlings, as the listing does not clarify suitability for that purpose.
Hardys Mature Plant Compost, 25L, John Innes No.3 · photo 2
Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 61 ratings
  • 5 stars77%77%
  • 4 stars17%17%
  • 3 stars3%3%
  • 2 stars0%0%
  • 1 star3%3%

Customer feedback reports positive impressions of compost quality and plant growth, including a comment that plants were thriving. The overall rating distribution is mostly five-star, but a small share is one-star, so experiences are not uniformly positive. These comments may matter to buyers using the mix for established plants, but they do not verify the listed formulation or feeding duration.

Positive themes

  • Customer feedback describes the compost quality positively.
  • Customers report positive plant-growth results.

Frequently asked questions

What plants is this compost intended for?

The listing describes it for mature, established plants, including houseplants, shrubs, fruit bushes, climbers and trees, as well as plants in pots, tubs and window boxes.

What does the listing say is in the mix?

It describes a soil loam base with organic matter, horticultural grit, John Innes No.3 nutrients and a water-activated slow-release feed claimed to last four months.

Can it be used indoors and outdoors?

Yes. The listing presents it for both houseplants and outdoor plants, including container and garden-bed use.

Hardys Mature Plant Compost, 25L, John Innes No.3 · photo 3
Additional product photo 3

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