When to Feed the Grass
Conditions for Application
To be read in conjunction with the product label
Adequate Soil Moisture
This means as long as the the lawn is actively growing and the soil is moist. It may not have rained for a week and there may be no rain in the forcast but as long as there is adquate soil moisture present then it is safe to apply. Some fertilisers do need watering in if there is no rain and this will be noted on the label. If the soil is dry and hard consider holding off until adequately watered.
Apply after Mowing
Always apply fertiliser straight after cutting the grass. This means it’s got maximum time to settle into the lawn before the next cut.
It is beneficial when using iron or liquid products to leave the box off for the first cut after application if your mower instructions allow.
Spring Lawn Feed
Being flexible and using a little common sense is the order of the day when using lawn care products. Plan to apply the spring fertiliser sometime in April. It all depends on how the weather is warming up but the best guide would be to wait until you’ve cut the lawn a couple of times first. This might mean in cool Kirkcaldy towards the end of April, in slightly chilly Chester the middle of the month with mild Margate perhaps early April. I quite often time it when or after the daffodils are fully open.
Summer Lawn Feed
You will normally apply your summer fertiliser between 10 to 14 weeks after the spring treatment. If the weather is dry then withhold fertiliser. It is not going to start working without moisture and though Lawnsmith® Fertilisers have little scorch potential, the salt content can add to already stressful conditions. If conditions suddenly change half way through the summer you can then feed the grass with a granular or liquid fertiliser.
Autumn Lawn Feed
September should be your target month for applying your autumn fertiliser. Once again national temperature and weather patterns apply but as a rule wait until the rains start in late August or September and then apply your lawn fertiliser. Dependant on where you live you’ll find some years this may mean end of August and other years early October.
Autumn treatments also need some common sense timing. My cut off for fertilising in Yorkshire is the first week of November. If you start putting nitrogen in too late in the year you can bring on some disease (fusarium). Therefore mid November could be the cut-off for balmy Bognor but perhaps mid October for crisp Cumbernauld.
Winter Lawn Feed
If you’re adding Green-Up Ferrous Sulphate in winter then consider September as your starter month. You can re-apply up to April very safely. Remember though that this is more like a vitamin and not food so you can and should still fertiliser as normal.
If you’re using an iron fertiliser such as WINTER GREEN High Iron then November onwards is best with a mild spell between December and January being optimal. Don't use it at the same time as Ferrous Sulphate though because Winter Green contains ferrous sulphate and you'd be over doing it if both were added in the same few weeks.
CAUTION: Iron whether in pure sulphate or fertiliser form will blacken moss at high rates in most conditions. This is the reason moss killer is ferrous sulphate based. It can blacken grass at high rates in dry conditions therefore always apply in cool wet conditions.