Guides · Dover Hedges & Tree Services

Rootball hedge planting in Dover: autumn timing, chalk soil and species guide

October is when rootball hedging season opens. Field-grown plants are lifted by machine from the first diggings of the month, wrapped in hessian and despatched to customers across the country. For Dover gardens on chalk, this is often the better option over bare-root whips (which are smaller and take longer to screen) or pot-grown stock (which is available year-round but costs more per metre). Provender Nurseries in Swanley, Kent, a wholesale nursery 30 miles up the A2, have published a practical Spotlight on Rootball Hedging video that covers the basics well. This guide applies their advice to Dover's specific conditions: thin chalk rendzinas, coastal salt exposure and the drainage patterns you find between the port and the Kent Downs National Landscape.

What is rootball hedging and what does it offer Dover gardens?

Rootball plants are hedging species grown in open fields for three to eight years, then lifted by a rootballing machine in the dormant season with a ball of soil intact around the roots. The ball is wrapped in biodegradable hessian or secured in a wire cage to keep it together during transport. The result is a plant with a full established root system, considerably larger than anything available as bare-root stock, and available at a fraction of the cost of equivalent pot-grown plants.

For Dover homeowners, this matters for two reasons. First, instant screening: a row of Portuguese laurel rootballs at 120 to 150 cm planted in October will provide a solid evergreen boundary by the following spring, without the two-to-three year wait for bare-root whips to bulk up. Second, structural strength on exposed sites: the rootball carries an established root mass that anchors the plant in Dover's Channel gales from the first winter, whereas bare-root whips need a full season just to develop enough root hold to resist wind rock.

When does the rootball season open in Dover, and how long does it run?

The rootball season opens in early to mid October when nurseries begin their first field liftings. It runs through to the end of March. The best selection of sizes and species is typically available from October to December, before popular lines sell out and before the remaining stock begins to break dormancy in February and March. For planting on Dover chalk, October and November are the ideal months: soil temperature is still above 8 degrees Celsius so fine root hair can begin regenerating, autumn rainfall is usually reliable, and the plant has the whole winter to establish its root-to-soil contact before facing summer drought.

Plants ordered in January or February establish well but face a harder first summer, particularly on thin downland rendzinas above Lydden, Alkham, Barham and the ridgeline above the port where water-holding capacity is low. Plants ordered in late March are approaching bud break and are correspondingly more stressed by the move.

Species available as rootball stock and which suit Dover chalk best

Not every hedging species is available as rootball stock. The main commercial rootball lines, and their performance on Dover's chalk soils:

• Portuguese laurel (Prunus lusitanica): the first choice for most Dover chalk plots. More drought-tolerant than cherry laurel, slower-growing, easier to keep in bounds. Available in rootball sizes from 80 to 100 cm up to 200 cm and beyond. Handles the thin rendzinas above the port and on the downland slopes well once the first summer is through. See our guide to Portuguese laurel hedge care in Dover.
• Yew (Taxus baccata): the best long-term formal hedge on chalk. Requires well-drained ground, which Dover's chalk usually provides, but will not tolerate waterlogging in any clay-over-chalk hollows. Slow in its first three years, then reliable. All parts toxic to humans, horses and dogs.
• Cherry laurel (Prunus laurocerasus): faster than Portuguese laurel and available in very large rootball sizes (up to 250 cm). Best suited to the deeper loam of the Dour valley floor (River, Temple Ewell, Kearsney) rather than the thinnest downland rendzinas, where it can struggle with summer drought. See our guide to cherry laurel hedge care in Dover.
• Hornbeam (Carpinus betulus): the best deciduous rootball choice for chalk. Holds its russet dead leaves through winter, giving winter privacy that beech provides less reliably. Tolerates heavier and more compacted chalk sites than beech. See our guide to hornbeam hedge care in Dover.
• Beech (Fagus sylvatica): performs well on free-draining chalk but slightly less tolerant of the very thinnest rendzinas than hornbeam. Classic choice for country-house boundaries on the Kent Downs. See our guide to beech hedge pruning in Dover.
• Hawthorn (Crataegus monogyna): available as rootball stock and extremely well-suited to Dover chalk. Thorny enough for a stock-proof boundary and high in wildlife value. Less common as rootball than laurels, but worth requesting from a specialist supplier. See our guide to hawthorn hedge care in Dover.
• Griselinia, Elaeagnus, Escallonia: available as large pot-grown or rootball stock and the best first-line choices for clifftop plots and coastal gardens on Castle Hill Road, Western Heights and the seafront approaches where salt spray eliminates laurels. See our guide to salt-tolerant hedges for the Dover coast.

How to prepare chalk soil for rootball hedging in Dover

Rootball plants are larger and heavier than bare-root or pot-grown hedging, so soil preparation matters more, not less. On Dover's chalk, the main obstacles are:

• Chalk pan: a consolidated layer of chalk rubble and fines, typically at 25 to 60 cm depth on the thin downland rendzinas above Kearsney, Alkham and the eastern ridgeline. Pan restricts root penetration and impedes drainage. Break through it with a crowbar or sharp spade before placing the rootball, but do not remove it entirely: the pan anchors vertical drainage into the chalk mass below.
• Low organic matter: chalk rendzinas hold almost no humus. Mix the backfill soil with 30% by volume of well-rotted garden compost or multi-purpose compost. This improves water-retention capacity in the planting hole without making it too rich (which would cause soft, frost-susceptible growth in the first season).
• Alkalinity: Dover chalk runs at pH 7.5 to 8.0. Most rootball species are lime-tolerant, so no acidification is needed or helpful. Do not add peat, sulphur or ericaceous compost.

Dig the hole or trench at least twice the width of the rootball and to the same depth. For a row of rootball plants at standard 60 cm spacing, a single trench is more efficient than individual holes and allows the backfill to be mixed uniformly.

The planting steps

1. Receive and store promptly. Do not leave rootballed plants on the surface for more than a few days. If planting is delayed, heel them into a shaded corner with the rootballs covered in damp compost or soil to prevent them drying out. Dover's autumn winds can desiccate exposed hessian quickly.
2. Check the ball on delivery. The soil should feel firm and moist, not loose and dry. A ball that has broken apart in transit has lost much of its value: the fine root hairs will have been damaged. Return or complain if the hessian is burst and the ball has collapsed.
3. Lower carefully into the prepared hole. Use planks as ramps for heavy specimens. Lower the ball, never the trunk. The top of the rootball should sit at, or very slightly above, the surrounding soil surface: on chalk rendzinas there is a risk of crown rot if the stem base is buried, particularly with yew and laurels on sites that sit wet in winter.
4. Leave the hessian in place. Genuine biodegradable hessian rots within six to eight weeks in the ground. Cutting it off risks the ball breaking apart and damaging the fine roots. If wire caging is present, fold the top ring of the cage down into the hole once the ball is seated.
5. Apply mycorrhizal inoculant. Sprinkle a mycorrhizal granulate product (such as Rootgrow) directly onto the hessian surface before backfilling. On Dover's chalk, where background mycorrhizal populations can be lower in recently cultivated ground, this significantly improves establishment speed.
6. Backfill and firm. Work the prepared soil-and-compost mix in around the ball in layers, firming with a boot heel as you go to eliminate air pockets. Do not compact so hard that drainage is impeded. Finish level with a slight depression around the plant to act as a watering basin.
7. Stake. All rootball plants over 1 m tall need staking on Dover's exposed coast. Use a low stake (30 to 40 cm above ground) with a rubber tree tie, set at 45 degrees to the prevailing wind direction (south-westerly for most of the year, but also north-easterly from the Thames estuary in winter). The goal is to hold the base firm so roots can grip, not to immobilise the canopy: canopy movement builds structural strength.
8. Water in. Even in October, water each plant thoroughly to settle the soil around the rootball. A bucketful per plant is the minimum; two buckets for anything over 150 cm. This is more about soil-to-root contact than moisture, but it also prevents the first autumn winds dehydrating exposed root ends.
9. Mulch. Lay composted bark mulch to a depth of 75 mm in a circle 500 mm beyond the plant stem. Keep mulch clear of the stem itself to prevent crown rot. On the thin rendzinas of the downland ridgeline, mulching is as important as watering: it moderates soil temperature and prevents the rapid moisture loss that exposed chalk is prone to in dry spring and autumn spells.

First-winter aftercare

Rootball plants planted in October need less intensive watering than summer-planted stock. Natural rainfall in Dover's October to February window is usually adequate unless there is an unusually dry autumn spell, which does occur. Check the soil weekly in dry periods and water if the top 10 cm of the planting trench is dry.

The main first-winter task is checking stakes and ties. After any gale, inspect each plant. If the stem has moved significantly within the tie, the stake may need repositioning. Loosen ties every six to eight weeks as the stem thickens. A tie that has become tight is a problem to address in the first year, before it cuts into the bark.

Rabbits and deer will browse new rootball plants on downland sites above Barham, Lydden and at the edge of the Kent Downs National Landscape. Fit individual spiral guards or netting sleeves to any plants on exposed edges. Our guide to new hedge aftercare in Dover covers deer and rabbit protection in detail alongside mulching and watering.

For comparison between rootball and other planting types, our guide to bare-root native hedge planting in Dover covers the November to February bare-root window for smaller-budget projects, and our guide to container-grown hedging in Dover covers year-round pot-grown planting.

Common questions

When does the rootball hedging season open and is October the right time to plant in Dover?

Rootball hedging plants are lifted from the field from October onwards and the season runs through to the end of March. October is an excellent time to plant: the ground is still workable after summer, soil temperature remains above 8 degrees Celsius so roots can begin to establish, and plants have the whole winter to settle in before the spring growth flush. On Dover's thin chalk rendzinas, October planting gives a rootball plant its best chance of surviving the following summer drought without intensive irrigation.

What is rootball hedging and how does it differ from bare-root or pot-grown plants?

Rootball plants are grown in open fields for several years, then lifted by machine in autumn and winter with a ball of soil around their roots, wrapped in biodegradable hessian. They are larger than bare-root whips (typically 80 cm to over 2 m tall) and give immediate height and density. Unlike pot-grown plants, rootballs are only available in the dormant season (October to March). Unlike bare-root whips, which are cheap but small, rootball plants suit situations where an immediate screening effect is needed.

Should the hessian on a rootball plant be removed before planting?

No. Genuine biodegradable hessian should be left in place. It holds the soil ball together during handling, protects the fine root hairs, and rots down within a few weeks once the plant is in the ground. Removing it risks the ball breaking apart and stripping the young feeder roots. If the plant is secured with a wire cage, the top half of the cage can be folded down into the hole, but leave the lower half under the ball. Synthetic polypropylene bags, sometimes used by discount suppliers, must be removed as they will not rot.

How do you prepare chalk soil in Dover for rootball hedging?

Dig a hole or trench at least twice the width of the rootball. On the thin rendzinas above Kearsney, Lydden, Alkham and the ridge above the port you will often hit chalk pan at 25 to 40 cm depth. Break through this pan with a fork or crowbar but do not remove the chalk. Backfill with the excavated soil mixed with 30% well-rotted compost to improve moisture retention. Apply mycorrhizal inoculant directly onto the hessian surface at planting. Do not add lime, fertiliser or peat: chalk is already alkaline and most rootball species are lime-tolerant.

Which rootball hedging species are best for Dover gardens?

Portuguese laurel is the first choice for most Dover chalk plots: drought-tolerant, slower-growing than cherry laurel, and reliably available in large sizes. Yew establishes well on chalk with good drainage. Cherry laurel suits the deeper Dour valley loam but can struggle on the thinnest downland rendzinas. Hornbeam and beech are the best deciduous choices, holding their winter leaves for year-round privacy. For clifftop and coastal plots on Western Heights and the Seafront approaches, Griselinia and Elaeagnus rootball stock handles salt spray better than laurels.

How much aftercare does rootball hedging need in its first winter on Dover chalk?

Rootball plants planted in October need less irrigation than spring-planted stock because rainfall is higher and evapotranspiration is low through winter. The main risk on Dover chalk is wind rock: the large above-ground mass acts as a sail in Channel south-westerlies and north-easterlies, and persistent rock breaks new root connections. Stake all plants over 1 m using a low stake (30 to 40 cm above ground) with a rubber tree tie. Check ties every six to eight weeks. Mulch the root zone to 75 mm depth with composted bark and water in any prolonged dry spells during October to February, which do occur on this coast.

← All guides