Willow hedges are one of the fastest ways to screen a garden, a paddock edge, or an overlooked corner. The plants are willing, the growth is quick, and the result can look soft rather than rigid. But spacing is where most privacy hedges succeed or fail. Plant too far apart and you spend two seasons looking at gaps; plant too tight and you create an expensive, thirsty thicket that needs hard pruning from the start. The right distance depends on the willow, the row pattern, and how much clipping you are willing to do.
Not every willow makes a good hedge. For a privacy screen, choose shrubby, vigorous types that respond well to cutting, such as Salix viminalis, Salix triandra, or a recognised hedge cultivar like Salix ‘Bowles Hybrid’. Avoid the huge weeping and white willows unless you have real space; they are beautiful trees, not tidy garden screens. Buy bare-root whips for economy, or larger potted plants if you want a head start.
Before you mark out distances, decide between a single row and a double row. A single row is cheaper and easier to trim. A double row gives a denser screen and a fuller face, especially in the first two years, but it doubles the plant count and the demand for water. Both work; they simply ask for different spacing.
For most garden privacy screens, a single row at 50–60 cm centres is the practical middle ground. It closes quickly without becoming a solid block of roots and stems. A ten-metre run at 50 cm centres needs about 21 plants; at 75 cm centres, about 14. That difference matters when you are buying whips by the bundle. If the site is exposed and you want cover fast, lean toward 45–50 cm. If you are patient and prepared to trim, 70–75 cm is fine.
A double row is the better choice for a boundary that needs to look solid from both sides, or for a garden that catches wind. Set the two rows 40–60 cm apart and stagger the plants so each whip in the second row sits opposite a gap in the first. Keep within-row spacing at 60–90 cm. This pattern fills the middle of the hedge and gives you more to work with when shaping the sides.
Woven willow screens are made from rods pushed into the soil and bent into a lattice. Space the upright rods 30–45 cm apart, then weave thinner rods between them. This style needs fresh, flexible willow and steady watering while it roots. It makes a handsome garden feature, but it is more labour-intensive than a straight whip hedge and less forgiving if the first summer is dry.
If you are planting potted willows rather than bare-root whips, 75–100 cm apart is usually enough. The plants are bigger, but they still need room to branch. Do not bury the stems deeper than they sat in the pot, and water them thoroughly in the first season. A larger plant bought in spring can look impressive by midsummer, but it will not tolerate a dry rootball.
Willow roots are built to seek water. That is part of what makes the hedge grow so fast, and part of what makes placement important. Keep willows away from drains, septic systems, foundations, and permanently wet structures. A generous margin—often several metres from anything you cannot afford to disturb—is wiser than planting tight to a wall and hoping for the best. The hedge also needs root room on its own side of the boundary, so set the planting line back far enough that the mature width fits within your garden.
If you are unsure about boundary ownership, drainage easements, or restrictions on planting near a shared fence, ask a qualified surveyor or your local authority before you dig. It is a dull five minutes that can save a much longer argument.
You do not need a complicated formula. For a single row, divide the length of the hedge by your chosen spacing, then add one plant for the end. For a double row, do that sum for each row and add a little spare for replacements.
A 12-metre single row at 60 cm centres therefore needs about 21 whips. The same run as a staggered double row needs roughly 42, plus spares. Buy a few extra. Willow whips are inexpensive compared with the cost of gaps, and a spare can be potted up or used to patch a failure.
Willow grows hard. In a reasonable first season, expect strong extension growth—often a metre or two from healthy whips—and a hedge that starts to look like a hedge by late summer. That speed is the reason to plant willow, but it also means you cannot ignore it. The first year is about water and weed control. Keep a clear strip at least 60 cm wide either side of the row, mulch with well-rotted organic matter, and water deeply during dry spells. Grass and bindweed compete far more than most people expect.
Pruning is where a willow hedge becomes a screen rather than a thicket. If you want density from the base, cut the new whips back to 20–30 cm in the first winter after planting. That feels brutal, but it encourages branching low down. If you need height quickly, leave more top growth and trim the sides instead. Once established, a late-winter cut and a midsummer trim will keep the face neat. Do not shear the same line relentlessly into old wood; vary the cut slightly and take out any dead or crossing stems with loppers.
Mark the hedge line with a taut string, then check for buried pipes, cables, and drainage runs before you dig. Clear a strip of turf, fork over the soil, and add compost if it is heavy or thin. Set the whips at your chosen spacing, firm them in, and water each one until the soil settles. Mulch, label the ends of the row, and put a temporary cane at each plant so you can see the pattern when growth starts. For the first summer, water deeply once a week in dry weather rather than little and often. Then sharpen your shears, because a willow hedge is a commitment—and a fast, forgiving one if the spacing is right from the start.
Photo: Jan van der Wolf / Pexels
