In-ground instant hedge installation guide

Living Walls™ are fully formed instant hedges, supplied in one-metre lengths and installed together to create a continuous hedge from day one.

This guide covers installing Living Walls™ directly into the ground, where roots can grow freely.

Before installation begins, make sure the person installing your hedge has read this guide, particularly the drainage, trench depth and spacing instructions. You may also like to view our installation video.

After installation, follow our care and maintenance guide for ongoing watering, feeding, trimming and general care.

For installation in containers, raised planters, planter boxes, some retaining walls and other restricted-root planting spaces, see our container and planter box installation guide.

Diagram:  Hedge bag sizes – 25L, 70L and 100L

Before you start

Handling Guidelines

• Safe lifting: Use both handles to lift hedge bags. Avoid pulling or dragging them, as this can tear the bags. Wear gloves, as the fibreglass rods can be rough on skin.
• Hedge weights and handling:
  • 100L hedge bags can weigh over 100 kg when wet and require two to four capable people to carry or mechanical assistance to move around the site.
  • 70L hedge bags, at around 65 kg each, require two capable people to carry.  
  • 25L hedge bags, at 25 kg, can generally be carried by one capable person.
  • View hedge bag specifications here

Site preparation

• Plan ahead: Before your hedge arrives, mark out the hedge line, check for underground services or other obstacles and test the drainage. Once you know the site conditions and required installation depth, prepare the trench. For new builds, consider doing the excavation while machinery is still on site.
• Check drainage before digging the trench: Drainage can vary along the hedge line, so check it at several points, particularly in low areas, heavy clay soil, areas with a high water table, or anywhere water tends to pool after rain. Dig test holes along the intended hedge line and follow our How to check and improve drainage guide to assess the site. If drainage is poor, improve it before installation and follow the WET HEAVY SOIL installation detail below.
• Extra soil: If you’ve removed large plants or roots or otherwise don’t have enough soil to backfill, bring in good-quality topsoil.
• Root control: For vigorous-rooted varieties such as Ficus tuffi, consider installing a 600–900 mm deep root barrier where roots need to be kept away from pipes, paths or other structures. Install the barrier before placing the hedge.

Preparing your trench

Standard trench dimensions

• 25L hedge bag: 250 mm wide × 150 mm deep × total hedge length
• 70L hedge bag: 400 mm wide × 250 mm deep × total hedge length
• 100L hedge bag: 500 mm wide × 300 mm deep × total hedge length

Installation depth adjustments

• Well-drained soil: Dig to the standard trench dimensions for your hedge bag size. Set the top of the rootball level with the surrounding ground.
• Heavy clay soil, wet sites or high water tables: Dig the trench about one-third shallower than the standard depth shown above, so the rootball sits about one-third above the surrounding ground level. For example, dig to about 170 mm deep for 70L hedge bags and 200 mm deep for 100L hedge bags. Cover the exposed sides of the rootball with soil, sloping it down to the surrounding ground. Keep soil off the top of the rootball and away from the plant trunks. See the WET HEAVY SOIL diagram.
• Light sandy soil or when installing your hedge across the top of a steep site: Dig the trench about 50 mm deeper than the standard depth. The top of the rootball will sit about 50 mm below the surrounding ground level. Keep soil away from the plant trunks. Cover the top of the rooball with mulch after installation. See the DRY SANDY SOIL diagram.

Diagram: Installation depth for wet/heavy and dry/sandy sites. End view showing the hedge, rootball, trench and surrounding ground level.

Dig and prepare the trench

• Dig the trench to the depth and width established above.
• Set aside enough soil for backfilling.
• Loosen any compacted soil at the bottom and sides of the trench with a spade. This allows roots to grow into the surrounding soil.
• Don't add extras such as gravel, compost, manure, water crystals or fertiliser to the trench. Gravel can worsen drainage problems. Compost and manure break down over time, which can cause the hedge to sink, and may be too rich for new roots. Fertiliser can damage roots at this stage, so apply it on top later.

Installing your hedge

Place the hedges beside the trench with the logos facing the same way. If the bags are numbered, line them up from left to right in order.

• Remove the bag: Cut open the square ends of each bag with a Stanley knife or similar cutting tool. Gently lift the hedge into the trench, using the bag as a sling if helpful, then remove the bag completely. Do not kick or roughly handle the rootball.
• Space the hedges: Each hedge rootball is approximately 900 mm long, while the foliage extends to about 1 metre. Set the rootballs about 100 mm (10 cm) apart, allowing one hedge length per linear metre of finished hedge. The bag handle is 1 metre long and can be used as a reference. See the rootball spacing diagram below.
  The foliage should meet. The rootballs should not. 
• Fit your space: If the trench length varies slightly from an exact number of metres, adjust the gaps between rootballs evenly to fit the available space.
• Cut the rootball only if necessary: If you need a shorter hedge length, for example to fill a half-metre gap, saw through the rootball between plants using a toothed tool. Keep as much of the rootball intact as possible. Do not use a spade.

Diagram: Rootball spacing – approximately 100 mm (10 cm) between rootballs. The foliage should meet; the rootballs should not. View along the hedge length.

Backfilling and watering

Once your hedges are upright and evenly spaced, start backfilling:

• Fill the trench halfway with the soil you set aside, packing it gently but firmly around and between the rootballs. Do not over-compact it.
• Water lightly to settle the soil.
• Finish backfilling. For raised installations, cover the exposed sides of the rootball with soil, sloping it down to the surrounding ground as shown in the WET HEAVY SOIL diagram. Keep soil off the top of the rootball and away from the plant trunks.
• Water thoroughly. For this initial watering, allow approximately 10–20 litres per metre, depending on hedge size.
• See our watering guide for ongoing watering requirements. 

Post-installation

• Trimming: Give your hedge a light trim after installation if needed to even up the shape. See our trimming guide for ongoing care.
• Staking: Generally not required. In windy exposed sites, add temporary support if needed. Place stakes, such as Waratahs, on the sheltered side of the hedge and run horizontal wire between them to support the hedge. Reducing the hedge height slightly can also reduce wind strain. See Do I need to stake my Living Walls™ hedge? for more information.
• Irrigation: We recommend and supply flow-regulated landscape drip line for in-ground Living Walls™ hedges. Your hedge will need regular, deep watering while it establishes. See Water for ongoing watering guidelines.
• Feeding: In spring and summer, apply a complete granular NPK fertiliser over the rootball area. Do not mix fertiliser into the trench at installation. See Feeding and mulching for ongoing feeding guidance.
• Mulching: Apply mulch around the hedge to help retain moisture and suppress weeds. Keep mulch away from plant trunks to reduce the risk of rot, and do not use fresh grass clippings. Refresh the mulch as needed, particularly after feeding in spring. See Feeding and mulching for guidance.

Care and maintenance

 For ongoing care, read and follow our care and maintenance guide.