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Gardener's Diary

April


In association with the Royal Horticultural Society

The Royal Horticultural Society

The Royal Horticultural Society is the UK's leading gardening charity dedicated to advancing horticulture and promoting good gardening.

Their goal is to help people share a passion for plants, to encourage excellence in horticulture and inspire all those with an interest in gardening.

In this section on Laterlife they share their expertise to provide your Jobs for the Month - making sure that your garden is ready for the season ahead.

Find out more about how to become a member of the RHS

Lawns: spring and summer care

At this time of year, the lawn is actively growing and requires feeding, moss-killing, weeding and regular mowing. Spring is also a suitable time to over-seed sparse areas.

Quick facts

Suitable for All lawns
Timing Early spring until late summer
Difficulty Moderate

Suitable for...

All lawns need feeding in order to maintain vigour. When feeding, look out for signs of pest or disease and apply moss killer if required. Regular maintenance is the best way to approach a lawn, and may avoid the need for renovation later on.

Over winter, the lawn does not grow much, but once the weather warms up in early spring, you can start mowing, and this is also a good time to over-seed any areas damaged over winter.

Lawn care treatments

Below are some of the tasks to undertake over spring and summer:

Mowing

This is the most obvious (and one of the most important) maintenance task over spring and summer. Mowing regularly keeps the lawn in good health. See our advice on lawns: mowing for more on the different cutting heights and mowing frequencies recommended in spring and summer.

Killing moss

Moss is a problem in damp, poorly drained lawns. Spring is a good time to remedy moss problems. There are several options for dealing with moss in lawns, see our advice on moss in lawns for further detail.

Feeding

In mid-spring (often late March to April), use a proprietary spring or summer lawn fertiliser at the manufacturer’s recommended rates. Feeding the lawn will increase vigour and help prevent weeds and moss from establishing. Apply fertilisers when the soil is moist, or when rain is expected.

If grass loses its vigour and freshness between late spring and late summer (often May to August), repeat the application of spring or summer lawn fertiliser or apply 15g per sq m (½oz per sq. yd) sulphate of ammonia mixed with four times its weight dry soil. Mixing with soil ensures even distribution and avoids scorching the grass. Apply this mixture in cool, moist conditions and lightly water it in. As an organic alternative, use chicken manure pellets. Repeat fertiliser application a third time if needed six to eight weeks later.

Do not apply spring or summer lawn fertilisers, chicken manure pellets or sulphate of ammonia after August. They contain too much nitrogen for autumn use, encouraging green leafy growth at the wrong time of year, when it could be damaged by winter cold or pests and disease.

Over-seeding

After moss or weeds have been removed, or where grass is growing sparsely, over-seeding may be necessary. Early autumn is the best time for this job, but mid-spring is also suitable.

  • Break up the surface with a fork and rake it to make a reasonably fine surface.
  • Sow grass seed at half the recommended rate or, where there are no recommendations, at 10-15g per sq m (½oz per sq yd). Lightly rake to incorporate the seed into the surface.
  • Where birds are a problem, net the area.
  • If the weather remains dry for two or three days water gently with a sprinkler.
  • Grass should sprout seven to 10 days after sowing.

In heavily used areas, choose a hardwearing utility mix containing ryegrass. Most lawn grasses do not thrive in shade, so for these areas choose a shade-tolerant mix.

Watering

Even if lawns turn brown and dry over summer, they usually recover well when rains return. Watering is usually not necessary over summer. See our advice on lawns: care during drought for more on limiting damage and conserving water in the lawn.

If you do have to water the lawn and maintain a green sward, water when the soil becomes dry, but before the grass turns yellow or brown. If the ground is very hard, aerate it by spiking with a garden fork before watering, to aid water penetration.

Watering once a week to every 10 days is normally sufficient. Ensure that the water reaches a depth of 10cm (4in) after each watering. In the middle of summer 1 sq m (1 sq yd) needs about 20-litres (5 gallons) every seven days.

Looking after new lawns

Lawns from turf should be left completely un-used for their first week. Lawns from seed should be left un-used until their first mowing. Avoid using new lawns heavily in their first season.

Newly laid lawns can be fed like established lawns. They need watering, but should not be over watered, as this may result in shallow rooting and poor establishment.

For advice on aftercare of newly sown lawns, see our advice on lawns from seed.

Problems

When over-seeding the lawn, it can be difficult to match the colour of a new seed mix with your existing lawn. In such circumstances it may be necessary to over-seed the whole lawn to achieve uniformity of colour and texture.

Areas of dry shade, such as under trees, become sparse very quickly despite adequate care. Consider over-seeding on an annual basis to maintain a dense sward.

Spring is a good time to repair damage to lawns caused by pests, diseases or mechanical damage.

The Royal Horticultural Society

Want more Gardening tips?
Why not view the Royal Horticultural Society's website.



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