Guides · Dover Hedges & Tree Services

Ash dieback in hedgerow trees around Dover

Ash dieback (Hymenoscyphus fraxineus) was first confirmed in the UK in 2012. Most of Britain's ash trees are expected to be affected over the coming decades, and Kent is well into that process. For a hedge owner in Dover, the practical issue 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. We do not fell trees. If an ash needs to come down or have major limbs removed, use a qualified arborist, and we can sort out the hedge side of the job around it.

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. A dying tree is not a dead one, so the notice still has to be filed unless the tree is dead (five working days' written notice) or an immediate danger (notify as soon as practicable afterwards). 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, 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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