How Should I Apply Lawn Fertiliser - Liquid or Granular?
When it comes to liquid vs granular lawn fertiliser, neither is "better" outright; they just suit different jobs. Granular feeds are slow-release, longer-lasting and easy to spread evenly with a spreader, so they are the backbone of most lawns. Liquid feeds are sprayed on, absorbed fast and ideal for a quick top-up on a small lawn. For most UK gardens a slow-release granular feed every 8 to 12 weeks is the sensible base, with liquid as the occasional booster.
The same nutrients are sold two ways: coated granules you spread, and a concentrate you dilute and spray. Both feed the grass, but they get there very differently. Here is how each applies, how long it lasts and which to reach for.
What is the difference between liquid and granular lawn fertiliser?
It comes down to timing and delivery. Granular fertiliser is solid prills that sit on the soil and release nutrients gradually as they break down with moisture, typically feeding for six to twelve weeks. Liquid fertiliser is sprayed on and taken in through the leaf as well as the root, so you see a response within days but it is used up far quicker. Granular is the marathon; liquid is the sprint.
How do you apply granular lawn fertiliser?
Granular feed goes down with a spreader, which is the big reason it suits most lawns: a wheeled or handheld spreader lays the prills at an even rate, so you avoid the stripes and patches you get throwing it by hand. Set it to the rate on the pack, work in slightly overlapping passes, then water it in if rain is not forecast. Because it is slow-release, one application feeds for weeks. Our summer feed is a good example, holding colour through the heat without forcing soft, scorch-prone growth.
How do you apply liquid lawn fertiliser?
Liquid feed is diluted with water and applied through a watering can with a fine rose or, more evenly, a knapsack sprayer. Keep the spray overlapping so every blade gets a light, even film; the goal is to wet the grass, not soak it. As the nutrients are already dissolved, the grass takes them up almost immediately, which is why liquid is the go-to for a fast response or for feeding a small lawn precisely. The trade-off is longevity: it is typically gone in two to four weeks, so it works best as a little-and-often top-up rather than your only feed.
When does liquid feed make the most sense?
Reach for a liquid when you want speed or precision: a quick green-up before a barbecue, an even feed on a lawn too small for a spreader, or a targeted tonic between granular feeds. Iron-based liquid tonics are a good example, deepening colour within days and giving moss a knock at the same time. The liquid range at Mowd is sized for keen lawn keepers and larger plots, so check the coverage on the pack against your lawn before you buy.
Liquid vs granular lawn fertiliser: which should you choose?
For most UK gardens, a slow-release granular feed is the sensible backbone: forgiving to apply, long-lasting, and steady across the season at roughly one feed every 8 to 12 weeks. Liquid is best as a complement, a fast booster when the lawn looks tired or a colour top-up between granular feeds. Granular tends to give more feeding per pound because it lasts longer, while liquid buys speed. Watch for scorch with both: applying too heavily, or feeding in hot, dry weather without watering in, can burn the grass, so always stick to the rate on the pack.
If you would rather not time those granular feeds yourself, a seasonal plan keeps that base ticking over hands-free: the right slow-release feed arrives matched to the season, so your lawn always has its long-lasting backbone in place and you simply add a liquid top-up for a quick lift.
MyLawn is Mowd's free DIY lawn-care app. It looks at your postcode's weather, the season and what you have already done, then tells you the single best next thing to do, in plain English, with reminders so a feed never gets forgotten. Take a look at MyLawn.
Related Mowd guides: UK Lawn Feeding Calendar · How to Green Up Your Lawn Fast · What Happens If You Don't Feed Your Lawn?
Frequently asked questions
Is liquid lawn feed better than granules?
- Neither is better overall; they do different jobs. Liquid acts faster and coats a small lawn evenly but is used up in two to four weeks. Granular is slow-release, lasts six to twelve weeks and makes the better everyday base. Many lawn keepers use granular as their main feed and liquid as an occasional booster.
Do you water in liquid lawn fertiliser?
- Usually not straight away, because much of it is taken in through the leaf, so it needs a few hours of dry weather to be absorbed. Always follow the pack; some liquids ask you to water in after a set time. Granular feed is the opposite and should be watered in so the prills start releasing.
Which lasts longer, liquid or granular fertiliser?
- Granular lasts much longer. A slow-release granular feed keeps working for roughly six to twelve weeks, whereas a liquid feed is typically spent within two to four weeks. That longevity is why granular tends to give more feeding per pound and suits a season-long programme.
Can lawn fertiliser scorch the grass?
- Yes, both types can scorch if over-applied or used in hot, dry conditions. Liquid can burn the leaf if mixed too strong or sprayed in strong sun, and granular can burn if laid too heavily or left dry on the surface. Stick to the rate on the pack, spread or spray evenly, and avoid feeding a stressed lawn in a heatwave.