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Keep mowing regularly, except during drought. In hot weather, set the mower at a slightly higher level than normal for early summer. This can prevent the lawn drying in hot weather.
Last time to apply a liquid summer lawn fertiliser, especially if a spring feed was not given. A soluble feed and weed product may be useful if there are weeds present in the lawn.
Don’t worry unduly about brown patches on the lawn - they will recover quickly when the autumn rains arrive.
If a completely green lawn is necessary, then use a sprinkler once a week. Place an open jam-jar on the lawn and leave the sprinkler running for sufficient time for 13mm (0.5in) of water to collect in the bottom of the jar. This is the optimum amount to avoid wasting water, while still wetting the roots sufficiently.
New areas of grass, sown or turfed in the spring, will need extra watering to keep them going through their first summer.
Lawn growth slows down in late summer. Raise the cutting height slightly as the month progresses, to help the grass better resist the wear it suffers in summer.
Inspect any yellow patches on the lawn: if they contain small pinkish-red strands, then you may have red-thread in the lawn. This is a fungal disease, common on light soils after heavy rain, when the nitrogen is washed out of the soil. A nitrogen-rich fertiliser should remedy the situation, and the damage is rarely long-lived.
By mid-summer some lawns may be heavily infested by ants. Brushing out the nests on a dry day is the best method of control, and should be done prior to mowing.
Isolated weeds can be dug out or spot-treated with a paint-on weedkiller.
When mowing, take time to generally inspect the lawn. You may notice areas that could benefit from more radical renovation in the autumn.
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Things to do in the garden this month
Trees and shrubs
Greenhouse, conservatory and houseplants
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.