Height is the first thing we think about when planting in Crowborough. The town rises to 242 metres at its highest point, which puts gardens up here into a colder, windier and later season than the ones down near the coast. Buds break later in spring, the first frosts come sooner, and a young tree has a great deal more wind to stand up to.
What 242 Metres Does to a Young Tree
A tree that has just gone in has no anchorage worth the name. Every time the wind moves the stem, the root plate shifts in the hole and the fine roots that were starting to take hold get torn. The tree is then stuck repairing itself instead of growing, and a season later you have something that has barely moved.
We deal with that at planting rather than afterwards. Stakes go in at an angle against the prevailing wind and low on the stem, so the roots are held still while the top is left free to flex, which is what thickens the trunk. Where the position is badly exposed we would sooner plant a smaller tree that establishes quickly than a tall one that spends three years fighting.
Sandy, Acid and Hungry Ground
The bedrock under the town is the Ashdown Formation, mapped by the British Geological Survey as interbedded sandstone and siltstone. It is the same rock that gives the neighbouring Ashdown Forest its character, where the soils that have formed over it are sandy, strongly acidic and low in nutrients.
Ground like that drains fast, which is useful in a wet winter and a problem in a dry June. It also means a tree that wants a sweet, fertile loam will yellow up and stall however much you feed it. Picking species that are at home on acid sand is far more effective than trying to argue with the soil.
