My cotoneaster hedge is covered in red berries and I want to cut it back before winter. Is autumn the right time, and do the berries matter?

Q. I want to cut my cotoneaster hedge back in October when the berries are ripe. Is that actually a problem?

A. It depends what you want to keep. Technically, October is fine for the plant, and there is no nesting-season issue at that point in the year. But cotoneaster berries are one of the main winter food sources for thrushes, blackbirds, fieldfares and redwings, and the fieldfares and redwings arrive in the Medway valley in October from Scandinavia specifically to strip berries like these. Cut in October and those birds lose that resource from your hedge. We do not tell people what to value in their own garden, but we always mention it. A lot of customers in Cuxton and Wouldham end up deciding to wait until February once they have thought it through, by which point the birds have cleared the berries anyway and the plant is ready for its main structural cut.

Q. So when is the best time to cut it?

A. Late January through to mid-February is the main window for structural work. It is after the winter birds have stripped the berries, before the white flowers form in May, and safely before the nesting season starts in earnest. That season runs roughly 1 March to 31 August under section 1 of the Wildlife and Countryside Act 1981, and cotoneaster is dense, thorny and warm on the inside, which makes it one of the most popular nesting habitats on a suburban Rochester road. Cutting during that window is not automatically illegal, but it requires a proper visual nest check immediately before each session, and any nest that is active stops the work until the young have fledged. We do a second lighter trim in late September if the hedge has put on a lot of growth through the summer, but we hold off while the berries are still on the bush.

Q. My hedge has white flowers in May and I like them. Does the cutting time affect flowering?

A. Yes, directly. Cotoneaster flowers on wood produced the previous year, so a late-winter cut before May removes this season's flowering wood and you will get very little blossom in the coming spring. If the flowers matter to you, the alternative is to cut after flowering finishes in June, once the petals have dropped and the tiny green proto-berries have set. The trade-off is that you are then working inside the nesting season, so a proper nest check first is essential. In practice, most customers on Rochester ME1-ME2 streets settle on one approach or the other: either cut in February (sacrificing one year's blossom) or cut in June after flowering (keeping the blossom but needing a nest check). The hedge rarely needs both cuts in the same year, and doing both doubles the disturbance and the cost for limited gain.

Q. My cotoneaster has got very wide over the years. Can I take it hard back, or does it die back like a leylandii if I cut into old bare wood?

A. Cotoneaster regenerates well from old wood, which is one of its real advantages over most conifers. Unlike leylandii, which dies from the inside if you cut past the green, cotoneaster will put out new buds from bare brown wood provided the cut is done in late winter or early spring when the plant's energy is pushing into new growth. We have done some substantial hard-backs on old road-boundary cotoneaster hedges in Frindsbury and Borstal, hedges that had got to a metre or more wide, and they came back clean within two growing seasons. What we avoid is a hard renovation in summer: cutting back hard when the plant is trying to set berries puts it under stress and recovery is noticeably slower. Do it in February, apply a general fertiliser to the base afterwards and water through the first dry spell. For a very severe renovation it is worth cutting the sides hard in year one and taking the top down in year two rather than everything at once, which gives the plant some leaf area to work from while it recovers.

Q. My cotoneaster runs along the boundary with a field and I want to remove a section entirely. Do I need permission first?

A. Probably yes, if the hedge borders agricultural land. The Hedgerow Regulations 1997 require you to notify the local planning authority before removing a hedgerow that meets the qualifying criteria: at least 20 metres in length (or shorter if it meets another hedgerow at each end) and on land used for agriculture, forestry, equestrian use or similar purposes. In Medway, that means a Hedgerow Removal Notice to Medway Council, which has 42 days to respond. An older hedge, one that is 30 or more years old and contains four or more native woody species in a 30-metre stretch, is generally considered important enough to be refused. Removing a qualifying hedgerow without notice can bring an unlimited fine and a requirement to replace the hedge at your own cost. The key distinction is that trimming is not removal: the 1997 Regulations apply only when you are taking a qualifying hedgerow out, not when you are cutting it back, even hard. If your property backs onto farmland or countryside estate land in Wouldham, Cuxton, Halling or Burham, this is worth confirming with Medway Council before you commit to any removal work.

Q. Someone mentioned the berries might be poisonous. Is that a concern when trimming?

A. The berries are mildly toxic if eaten in significant quantity, but they are not a meaningful hazard during routine hedge trimming. They are nowhere near as toxic as yew, and the main practical concern during cutting is eye protection from wood fragments and debris rather than berry contact. Children and dogs do occasionally eat a handful of berries from the ground, and a small amount causes a stomach upset rather than anything serious. It is worth knowing about if you have very young children who pick things up in the garden, but it is not a reason to avoid cotoneaster as a hedging species, and it does not change how we approach the cutting work itself.

Q. My hedge is inside the Rochester Conservation Area. Does that change anything?

A. For routine trimming, the Conservation Area rules do not apply to hedge work. They become relevant if a mature cotoneaster stem has reached 75mm or more in diameter at 1.5 metres above ground, which can happen on a long-established garden or boundary hedge. At that point the stem is treated as a tree under section 211 of the Town and Country Planning Act 1990, and removing it, or carrying out substantial work on it, in a Conservation Area requires a six-week notice to Medway Council before work starts. In practice we check stem diameters on any hedge we are quoting in the Conservation Area. Most cotoneaster hedges never reach 75mm stems unless they have been left as standards or badly neglected for decades, but it does come up occasionally on older properties around Boley Hill and the Cathedral precinct.