Aeration is where you add to the available air between soil particles. It mainly applies to lawns but can also apply to borders. With regards to borders the main technique is to fork over the soil at least once a year. Pots also need air in the soil and this is the reason that some potting mixes should include sand. With regards to lawns, getting more air beneath the grass surface is more difficult. It can involve cutting slits in the lawn or spiking the lawn or removing cores of earth and replacing with a sand mix. Aeration in lawns also helps grass by allowing water to penetrate to the roots in times of drought.
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