Most of the planting we are asked to do around Heathfield involves boundaries rather than one tree on a lawn. This is farmed country with a long history of hedged fields, so the jobs that come in tend to be gapping up a hedge that has thinned, replanting a line that was grubbed out years ago, or getting shelter onto a bare field edge.
Ridge Ground and Valley Clay
Heathfield sits high, at around 150 metres, and the bedrock underneath it is mapped by the British Geological Survey as the Ashdown Formation, a mix of sandstone, siltstone and mudstone. Head south towards Horam and the ground falls away to roughly half that height, with Wadhurst Clay coming in alongside the Ashdown Formation, a mudstone the survey describes as soft and dark grey.
That is the reason a field at the top of your land and a field at the bottom can behave like two different farms. The high ground drains freely and dries out hard in a long summer. The low ground holds water all winter, and a pit dug in February can still have standing water in it an hour later. Alder, English oak, hornbeam and field maple will take wet feet. A pine put in the same hole will rot off at the roots.
Gapping Up an Old Hedge
A Wealden hedge that has been cut tight for decades often has gaps at the base where the old stools have given out. Filling those is skilled work, not a matter of pushing whips into the holes. The new plants are competing with established roots for water, so the ground has to be opened properly and the competition cut back, or the gaps are still there in three years.

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