Opening wet soil during the winter months can prove damaging – especially in loam and clay soils. With little infiltration, water collects and makes soil conditions wetter. Whether verti-draining, earthquaking or solid tining, reservoirs for water collection are being created. To have any benefit on heavy soils severe aeration should be undertaken in relatively dry soil where the implement used causes fracturing. Only limited slitting should be undertaken in the winter – and even then the soil surface should be firm and not saturated.