Hedges define boundaries, give privacy and shelter, and provide a garden feature. Hedging is planted at high densities and so plants compete with each other from an early age. Consequently careful preparation and planting are essential.
Time
Most hedging plants are supplied as bare root specimens. These are best planted during winter, while plants are still dormant. Avoid planting in very cold or wet weather.
Soil preparation
Prepare the ground by digging over an area 60-90cm (2-3ft) wide and one spit (or spade blade) deep. If a herbicide has not been used beforehand remove all weeds. On a light soil organic matter, such as garden compost or a proprietary tree and shrub planting mix, can be spread over the soil and forked in. On poorly drained soils fork into the surface horticultural grit and composted bark and form a ridge about 15cm (6in) high to plant into. Do not add organic matter or grit to the bottom of a trench which merely creates a sump. Soils that become waterlogged in winter may require a permanent drainage system.
Planting
Planting distances vary from 30-60cm (1-2ft), depending on the plants’ vigour. For hedges thicker than 90cm (3ft) plant a staggered double row 45cm (18in) apart, with plants 90cm (3ft) apart.
Trim back damaged roots to healthy growth. Spread roots out thoroughly, ensuring the planting depth is correct (note the previous soil mark on the stem). Work soil between the roots, firm plants in and then water and mulch well.
Aftercare
Ensure plants are well-watered for the next two growing seasons. Top-dress annually with a general-purpose fertiliser, and re-apply mulch as required.
Keep the surrounding area weed free. Erect a windbreak in exposed sites, on the windward side, until plants are well established.
Further information
Eco Tree Care & Conservation - native hedge planting
Leylandii action group website