Garden privet

Privet earned its reputation as the twentieth century’s default garden hedge by growing faster and asking for less than almost anything else you could plant in a straight line. It is semi-evergreen to evergreen depending on how cold the winter is, tolerant of full sun or part shade, and unfussy about soil, which is exactly why it ended up along the front of every suburban garden built in the same decade. None of that makes it a plant you can ignore. A privet hedge left unclipped for a season or two stops being a hedge and starts being a row of small trees, since the species itself will reach four to eight metres if nothing ever cuts it back; every clipped hedge you have ever seen is being actively kept at a fraction of its natural size.

Planting a hedge

Space young plants roughly 30 to 45 cm apart for a dense screen within a reasonable number of years, closer if you want it to fill in faster and are prepared to thin later. Plant in the dormant season, which for a temperate climate means the leafless months when the soil is workable and not frozen or waterlogged: October to March in the northern hemisphere, with bare-root stock sold only in that window, and roughly May to August south of the equator. Container-grown plants are more forgiving of timing but still establish best planted in the cooler, wetter part of the year rather than the height of summer.

Light

Full sun gives the densest, most even growth, but privet is one of the few hedging shrubs that genuinely tolerates a shaded boundary without thinning out. That tolerance is the whole reason it gets specified for the side of a garden nothing else will screen.

Water

Water two or three times a week through the first two summers, while the roots are still finding their way into the surrounding soil. After that, rainfall is normally enough, and the plant only needs help in a real dry spell. Keep a weed-free ring around the base in the first year, since competition for water and nutrients slows a young hedge more than most owners expect.

Feeding and pruning

Feed is rarely necessary on reasonable soil. A spring mulch of well-rotted compost or leafmould does most of the work a fertiliser would. Where growth is visibly weak, a hedge fertiliser applied in spring is worth trying before assuming a pest or disease problem.

Clip two or three times during the growing season and stop by late summer, so the last flush of growth has time to firm up before the cold. Check for an active bird’s nest before cutting; in the UK it is an offence to disturb one. Privet’s fast growth cuts both ways: a hedge trimmed to the same line every year eventually goes bare and twiggy at the base, because the interior is shaded out. A hard cut back into old wood in the dormant season, done once every several years, keeps it dense from the ground up rather than just at the top.

Propagation

Hardwood cuttings taken in the dormant season root reliably in open ground or a cold frame, which is how most hedging privet is still produced commercially. Semi-hardwood cuttings in late summer work as well for a smaller batch.

Ailments

Honey fungus is the one genuinely serious risk: privet is more susceptible to it than most garden shrubs, and there is no chemical treatment, only removing every trace of infected root. Privet thrips cause a grey, silvered stippling on the leaves from late spring through autumn but rarely trouble an established hedge enough to need a spray. Both are worth knowing before you plant privet next to something harder to replace.