For a traditional UK lawn that needs feeding, mid-spring is a common starting point, once grass is actively growing. If it needs an autumn application, use a feed intended for that season. Follow the product’s timing, rate and watering directions, and check the weather before spreading it.
Feeding is optional: many lawns grow well without it. A pale lawn can also be responding to drought, shade, wear or a recent close cut, so look at the growing conditions before applying fertiliser.
Spring: feed during active growth
As the weather warms and mowing resumes, assess how the lawn has come through winter. If it would benefit from feeding, choose a spring or summer lawn fertiliser and apply it at the stated rate. The RHS suggests mid-spring, usually late March to April, for a traditional lawn that needs a boost.
Wait if the ground is frozen or saturated. Walking repeatedly across soft, wet soil with a spreader can damage the surface.
Summer: check the previous application
Some spring and summer feeds release nutrients over several months. Before applying again, check the product’s stated duration and minimum interval. Avoid treating a dry, stressed lawn simply because the calendar says it is time: follow the label’s instructions on soil moisture, rain and watering, as well as any local water restrictions.
Autumn: use an autumn formulation
Early autumn is a useful time to inspect wear and make repairs. If the lawn needs feeding, choose a product labelled for autumn rather than assuming the spring feed is suitable. The RHS autumn guide notes that many lawns recover without an application.
If you are also seeding, check that the product is suitable for use with new seed and follow both labels. For bare areas, see how to repair a patchy lawn.
Winter and difficult conditions
Growth slows in cold weather, so don’t apply a feed on a fixed winter date without checking the product and conditions. Keep off frozen or waterlogged ground where possible. If you want a lawn with more wildflowers, the RHS advises that feeding is not required.
Before applying any lawn feed
Measure the area, calculate the quantity from the label and spread it evenly. Follow the product’s directions for watering and for keeping children and pets off the lawn. Our guide to NPK on fertiliser labels explains what the nutrient numbers mean.