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Ash dieback in hedgerow trees around Dover

Ash dieback (Hymenoscyphus fraxineus) was first confirmed in the UK in 2012. Kent's woodlands felt the impact early. The Kent Downs Ash Project projects 90 to 98% ash loss across Great Britain over the coming decade, and the East Kent landscape is well into that trajectory. For a hedge owner in Dover, the practical issue is not the woodland — it is the hedgerow-standard ash tree overhanging your garden.

What ash dieback does

The pathogen enters the leaves in summer, moves down into the shoots and stems, and progressively kills the crown from the tips inward. Typical progression:

• Year 1–2: leaf blackening, wilting of leaf tips, minor crown thinning.
• Year 3–5: whole shoots dying back, "witches broom" epicormic response on the trunk, visible crown loss.
• Year 5–10+: major crown loss, dead branches, structural failure risk, secondary fungal infection at the base (Armillaria).

Not every infected tree dies quickly. Some ash show low-level tolerance and hold on for years. But once the crown is more than 50% affected, safety over public spaces and adjacent buildings becomes the real issue.

Why it matters at a garden scale

Ash was one of the most common hedgerow standards across the East Kent farmland. Now, ten to twelve years after the pathogen arrived, we are seeing the delayed structural failure phase. Dead branches drop unpredictably from mid-summer onwards, and whole trees can fail in a moderate wind. If you have an ash overhanging your garden, a fence line, a driveway or a public footpath, the risk assessment has moved out of "watch and wait" territory.

What we do

Ash removal is tree work, not hedge work, and we are honest about the boundary. On a small hedgerow ash (stem under 200 mm at 1.5 m) in a hedgerow being managed by us we will fell it as part of the hedge job. On anything larger we bring in a chainsaw-competent arborist and coordinate the work with the hedge job. We will not attempt a large ash from a MEWP or by climbing without the right qualifications.

Conservation area and TPO check

Ash trees inside a CA over 75 mm at 1.5 m are still caught by s.211 even if dying. DDC's tree officer will normally consent quickly to work on a confirmed dieback tree that is a safety risk, but the notice still has to be filed. TPO-protected ash requires TPO consent regardless of CA. Both flow off the same six-week clock in most cases.

Replacement planting

If the ash was in a mixed hedgerow line, replacement is a per-site decision. On chalk we would default to field maple (Acer campestre) as a hedgerow-standard replacement — native, chalk-tolerant, wildlife-supporting, and not currently subject to a landscape-scale pathogen. Small-leaved lime (Tilia cordata) is another option if you want a larger tree.

Safety timing

The riskiest time for structural failure is summer, when the crown is leafed and wind loading is highest on any weakened structure. If you are on the fence about removal timing, the argument for doing it in the following winter, before summer, is real.

Ash on public trees near your property

If the tree at risk is on Kent Highways land, DDC public land, or National Trust land (particularly along the cliffs), report it to the relevant authority through their tree-report route. Most of these bodies have active ash-dieback survey programmes and will prioritise safety-critical sites.

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