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Planting a new native hedge on chalk: from bare boundary to established hedge

A new field boundary or garden hedge on Shepherdswell's thin chalk soil starts as nothing more than a bare line and a lot of patience. Here's what that bare start looks like, what a properly established native hedge looks like a few years on, and the bare-root planting method that gets you from one to the other without losing half the plants in the first summer.

Before

A new hedge line before planting is exactly that: bare ground, maybe a fence or a line of canes marking where the hedge will run, and thin, free-draining chalk topsoil that drains and dries faster than most people expect the first time they dig into it around here. Nothing wrong with the site, this is just what North Downs ground looks like before anything is in it.

After

A native hedge planted properly and given three to five growing seasons is dense from the base, knee-to-waist height at minimum and building, with hawthorn and blackthorn forming the thorny structural backbone and gaps filling in year on year. It won't look like a finished formal hedge that fast, native mixed hedging fills out gradually rather than fast like a Leylandii screen, but it will already be doing its job: a stock-proof or privacy boundary that only gets denser with each year's growth and each winter's formative cut.

What happens in between

The RHS's own guidance for a bare-root mixed wildlife hedge is the method I follow for chalk boundaries around here:

• Timing: bare-root season, October to February. Avoid planting when the ground is waterlogged, but on free-draining chalk that's rarely the problem here, the bigger risk on this soil is planting too late and losing establishment time before the ground dries hard in early summer.
• Species mix. Hawthorn (Crataegus monogyna) as the backbone, dense and thorny and genuinely happy on chalk, with blackthorn (Prunus spinosa) worked through it for earlier spring flower and extra density lower down. Field maple, dogwood and dog rose add mix and wildlife value without competing hard against the two main species.
• Spacing for a proper thick hedge: a staggered double row, rows 45cm apart, plants 90cm apart within each row, offset so each plant sits in the gap of the opposite row rather than directly across from it. A single row grows thinner and gappier faster.
• Planting method. Plant to the same depth the roots were growing at in the nursery, not deeper, firm the soil gently around the roots by hand rather than heavy foot-tamping, and water in straight away to settle the soil around the roots even in damp autumn weather.
• Year one aftercare. A bark mulch strip either side of the row suppresses grass competition, which matters more on quick-draining chalk than on heavier ground, since grass and the new hedge are both competing for the same thin moisture reserve. Water through any dry spell in the first growing season, chalk soil holds far less water than clay and new bare-root plants have no established root system yet to find it themselves.

What can go wrong

The two failure modes I see most on chalk: planting too shallow so the roots dry out in the first hot spell (chalk warms and dries fast near the surface), and skipping the first-year watering because "it's been planted, it's done" when a bare-root hedge on this soil genuinely needs watching through its first summer. Get those two things right and native hedging on chalk establishes reliably, it's the soil most of the older field boundaries around Coldred and Eythorne are already growing in.

Sources: RHS, "Plant a bare root mixed wildlife hedge" (rhs.org.uk); RHS hawthorn growing guide; Wildlife and Countryside Act 1981, section 1.