Independent comparisons. We may earn from shop links. More info

Best Substral Lawn Fertiliser

Updated: October 2026

If you are feeding a large UK lawn in spring, the best Substral lawn fertiliser depends first on area and season, not the cheapest pack or the highest star rating. Our top pick is Premium Sport & Play for a measured lawn near 400 m². Express Sport & Game is the best value when you can use its stated 600 m². Neither is an autumn feed, and both are poor buys for a small garden. The [Substral lawn fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/substral-lawn-fertiliser) lists all seven amazon.co.uk listings, with prices and conflicts left visible. We compared those listings and did not run a lawn trial. A qualifying purchase can earn us a commission at no extra cost to you.

If you are feeding a large UK lawn in spring, the best Substral lawn fertiliser depends first on area and season, not the cheapest pack or the highest star rating.

Our top picks

Substral Substral Moos with extra iron

Best overall

Substral Substral Moos with extra iron
9.0/10about £49.25
View offer
Substral Substral Express Sport & Game

Preis-Tipp

Substral Substral Express Sport & Game
8.8/10about £109.69
View offer
Substral Substral Premium Sport & Play

Rank 3

Substral Substral Premium Sport & Play
8.2/10about £91.10
View offer
On this page
  1. 1.Top pick for a 400 m² spring sport lawn
  2. 2.Best value when you will use about 600 m²
  3. 3.Who should skip both large bags
  4. 4.Do not use either bag in October

Top pick for a 400 m² spring sport lawn

Substral Premium Lawn Fertiliser Sport & Play is the conditional top pick because the listing gives the details needed to plan an application: a 10 kg pack, 400 m² coverage, a rate of 25 g/m² and a stated 20:5:8 ratio. The programme starts in March or April and then names May to August, which fits a dense, actively growing all-grass lawn. It also names spreaders and robotic mowers. The limits are firm. At about £91.10 the pack is a large purchase if your lawn is only 80 m², and storing the remainder does not make a spring product suitable for October. The 4.1 score is based on ten ratings. A comment on the listing, labelled Reviewed in Germany, describes scorch after heavy spreading. Measure the lawn, weigh 25 g for each square metre and calibrate the spreader. Skip Premium for meadow grass, flowers in the lawn, hand spreading or feeding after August. The lawn fertiliser buying guide explains when feeding is unnecessary.

Best value when you will use about 600 m²

Substral Express Sport & Game is the conditional best value if the area is the one in the title. The amazon.co.uk price was about £109.69 for a 15 kg bag stating 600 m², or roughly £0.18 per stated square metre for one application. Premium works out at about £0.23 per stated square metre. Express is cheaper by area, even though its shelf price is the highest in the set. You only realise that value if your lawn is close to 600 m² and the product suits the season. Buying 15 kg for a 100 m² garden ties up more money and leaves a large remainder. The listing names spreaders and robotic mowers, but it does not state a season. It states 14% nitrogen and 5% potassium oxide. Phosphorus is not stated, so 14:5 is not a complete NPK analysis. The rating is 4.4 from 50 ratings. Comments were mixed on the seven-day visible-result claim, and the written comments were labelled Reviewed in Germany, not UK review opinion.
Substral Substral Moos with extra iron

Testsieger

Substral Substral Moos with extra iron
9.0/10about £49.25
View offer

Who should skip both large bags

If that area is not yours, another listing may fit, or feeding may not be needed. The Substral Moos bag states about 140 m², a 6:5:10 ratio and a March-to-September window. It costs more per stated square metre than the sport bags, but a 4.2 kg pack can be better value than unused fertiliser. Its wording says a stronger lawn competes with moss, which is not an authorised moss-killing treatment. The organic granules have 222 ratings but no numeric coverage, NPK line or season. EasyFix includes seed as well as fertiliser, so it is a repair product. Rasen-Vital conflicts between up to 67 m² and 10 m².

Do not use either bag in October

Skip both sport bags in October. The Royal Horticultural Society advises against using leftover summer feed in autumn, and neither title in this seven-product set is an autumn-only feed. Premium’s programme stops in August. Express has no season stated on the listing. Match the month on the spring or autumn lawn feed page before you spend.

Common questions

Which Substral lawn fertiliser is the top pick?
Premium Sport & Play is the top pick when you have an all-grass sport or play lawn near 400 m² and you are feeding in its stated March-to-August programme. Its 25 g/m² rate and 20:5:8 line make planning clearer. Skip it for a small garden, a wildflower lawn, hand spreading or autumn use.
Which option is best value?
Express Sport & Game is best value by stated area, at roughly £0.18 per m², from the about £109.69 price and the 600 m² title coverage. That condition is essential. If you use only a fraction of the bag, the lower calculated unit cost does not make it the economical purchase.
Is the £15.35 iron bottle the bargain?
It has the lowest shelf price, but it is a specialist iron feed with no square-metre coverage, NPK analysis or dilution rate on the listing. The listing also conflicts on bottle size, at 250 ml and 2,000 ml. Buy it only when iron is the job and you can verify the physical label, not as a seasonal lawn programme.
What should I choose for about 140 m²?
The Moos granular listing states about 140 m², a 6:5:10 ratio and use from March to September. That pack is easier to match than either large sport bag. Do not infer that it is an authorised mosskiller. No MAPP number was recorded for this ASIN.
Can I use Premium or Express in October?
Premium’s programme stops in August, and Express has no season stated on the listing. The Royal Horticultural Society says not to use leftover summer feed in October, because its nitrogen balance is wrong for autumn. Choose a clearly labelled autumn product elsewhere, or do not feed if the lawn does not need it.
Were these products laboratory tested?
No. Products Compared compared amazon.co.uk listing details, shelf prices, rating counts and public UK guidance. It did not conduct a laboratory or lawn trial. Written comments in the listing data were labelled as reviews from Germany, so they are not presented as UK user experience.

Related pages

How to apply lawn fertiliser

Lawn fertiliser and moss

Substral lawn fertiliser

Lawn Fertiliser Buying Guide: Season, Job and Area

Spring or Autumn Lawn Feed: None of These Is Autumn

Sources

Public UK sources and amazon.co.uk listings used for this comparison; last accessed 15 October 2026.

  1. RHS: Spring and summer lawn care (retrieved 15 October 2026)
  2. RHS: Autumn lawn care (retrieved 15 October 2026)
  3. RHS: October lawns (retrieved 15 October 2026)
  4. RHS: Fertiliser labels explained (retrieved 15 October 2026)
  5. RHS: Moss in lawns (retrieved 15 October 2026)
  6. Fertilisers Regulations 1991, Schedule 2 (retrieved 15 October 2026)
  7. HSE: Garden and home pesticide use (retrieved 15 October 2026)
  8. HSE: Lawn-treatment labelling (retrieved 15 October 2026)
  9. amazon.co.uk Substral lawn fertiliser listings, 15 October 2026 (retrieved 15 October 2026)