How to Move Perennials and Shrubs Without Loss

Most perennials and shrubs move successfully between October and mid-March, while they are dormant, provided you take a root ball at least a third as wide as the plant’s spread. Get those two numbers right and survival runs above 90%. I have moved 16 plants around my own Stafford garden over the past two seasons and lost exactly one: a 12-year-old daphne that every reference said to leave alone. The other 15, from a 55cm-ball viburnum to a clump of asters the size of a dustbin lid, are all growing. This guide covers timing by season, root-ball sizes by plant age, the year-ahead root pruning trick for big shrubs, the lift itself, and the watering routine that carries everything through its first summer.

When is the best time to move perennials and shrubs?

October to mid-March is the moving window for almost everything in a UK garden. Within that window, autumn wins. Soil in October still holds 8-12C of summer warmth, so a moved plant grows new feeding roots for six to eight weeks before growth stops. A plant moved in March gets no such head start; it must regrow roots and support new leaves at the same time. In my garden the October movers wilted less the following summer than the March movers, every single time.

Evergreens are the exception. They lose water through their leaves all winter, so a December move leaves them drinking through a damaged root system in drying winds. Move them in early October or wait until April. Ornamental grasses are fussier still and want spring only; autumn-moved grasses often rot at the crown. Check the Met Office frost outlook before a late-winter move, because lifting a root ball from frozen ground tears it apart.

Many border perennials are better split than shifted whole. If the clump has a dead centre, division gives you three or four young plants instead of one tired one; our guide to perennials to divide in May covers the late-spring candidates such as hostas and hardy geraniums.

The ideal moment: late October, leaves dropping, and soil still holding 10C of summer warmth for new root growth.

How big should the root ball be?

Take a root ball at least a third as wide as the plant’s branch spread, and 25-30cm deep. That is the rule I now work to after measuring every move since 2024. A shrub spreading 1.2m needs a 40cm ball. A 2m philadelphus needs 65-70cm. Skimp on this and you leave the fine feeding roots, which sit at the drip line, in the ground.

Age changes the maths because roots thicken and anchor with time:

• 2-3 years planted: a 30cm ball, liftable by one person. These barely notice the move.
• 4-7 years planted: a 45-60cm ball weighing 30-50kg in wet soil. Two people, and a tarpaulin to drag rather than carry.
• 8 years and older: a 60-90cm ball, plus the year-ahead root pruning described below. My 55cm viburnum ball needed two of us and ten minutes to shift 7 metres.

Herbaceous perennials are simpler. Lift the whole crown with a fork, and most clumps come up with a 25-30cm ball of their own accord. Asters, daylilies and geraniums tolerate losing half their roots and barely sulk. Depth matters more than width for these: get the fork 25cm down so the crown lifts intact rather than shearing off.

Root pruning: the year-ahead trick for older shrubs

Root pruning means slicing a circle around the shrub a full 12 months before you move it. Push a sharp spade in to its full blade depth, about 28cm, in a continuous ring the same diameter as your planned root ball. Do it in October. The severed roots respond by producing a dense mat of fibrous feeding roots inside the circle, exactly where your root ball will be cut the following autumn.

The difference is not subtle. The viburnum I root-pruned in October 2023 came up with a tight, fibre-packed ball and dropped almost no soil. An unpruned weigela of similar age, lifted the same week, shed a third of its root ball on the tarpaulin and took an extra season to recover. The RHS recommends the same year-ahead preparation for any established tree or shrub, and on heavy Midlands clay I would call it essential for anything over five years old.

If 12 months feels too long, even 8 weeks of notice helps. Slice the circle in August for an October move and you get a partial root response. It is roughly half the benefit, but half is better than none.

How do you lift a shrub without killing it?

Dig the new hole before you touch the plant; a root ball should be out of the ground for minutes, not hours. Roots exposed to drying air start dying in about 20 minutes on a breezy day. Here is the sequence I use:

1. Water the day before. 15 litres over the root zone. Moist soil holds the ball together; dry soil falls off the roots like crumble topping.
2. Prepare the destination. Twice the ball’s width, exactly its depth. Fork the base and sides so new roots can push out.
3. Tie in the branches. A loop of soft twine pulls the framework upright and saves your face during the dig.
4. Trench around your marked circle. Dig a 20cm-wide trench just outside the root-ball line, down to 30cm.
5. Undercut at 45 degrees. Work the spade beneath the ball from all sides until the plant rocks freely.
6. Tip and slide. Rock the ball onto a folded tarpaulin or hessian sheet, then drag it to the new hole. Never lift by the stems; carry the ball, not the plant.

Replant at exactly the same depth as before. The old soil mark on the stem is your guide, and burying it even 5cm deeper can rot the bark of most shrubs. If you are rescuing a single established plant rather than reorganising a border, our step-by-step guide to moving a shrub safely walks through one move in finer detail.

The undercut: work the spade beneath the ball from all sides until the plant rocks free, then slide it onto a tarpaulin.

Replanting and the first year of aftercare

Water a moved shrub with 10 litres a week from April to September, doubling that in any dry spell over a fortnight. This single habit decides more outcomes than the dig itself. A moved plant has lost up to two-thirds of its root system; what remains cannot reach far for moisture, so the hose has to bridge the gap for one growing season.

Backfill with the soil you dug out, not bagged compost. A pocket of rich compost in clay acts like a sump, and roots circle inside it rather than venturing into the native soil. Firm the soil in layers with your boot heel, then build an 8cm-high ring of soil at the root ball’s edge to form a watering basin. Each 10-litre can then soaks down rather than running off. The same depth-and-firming rules apply when you plant a bare-root tree, and getting them wrong causes the same slow decline.

Mulch the root zone 5-7cm deep with bark or garden compost, keeping a 10cm collar clear around the stems. On my clay, mulched movers needed watering roughly half as often as bare-soil ones. There is a full breakdown of materials in our guide to what mulch is and how to use it. When you do water, water deeply and infrequently; the technique in how to water a garden properly applies doubly to transplants. Skip fertiliser entirely in the first spring. Feed pushes leaf growth the reduced roots cannot supply.

The watering basin at work: an 8cm soil ring holds each 10-litre can over the root ball instead of letting it run off.

Which plants survive moving and which hate it?

Fibrous-rooted plants move well; tap-rooted species and a short list of resenters usually die. The pattern is all in the root architecture. A hosta or hydrangea carries a dense mat of shallow, branching roots that regenerate quickly. An oriental poppy runs one thick tap root 40cm down, and when the spade snaps it, the plant has no plan B.

The peony deserves a special mention because the folklore is wrong. Herbaceous peonies transplant happily in October if the buds end up 2.5cm below the surface; plant deeper and they live but refuse to flower. I moved a 5-year-old ‘Sarah Bernhardt’ in October 2025 and it carried four blooms this June. If a move kills your peony’s flowering for years, the depth was wrong, not the move; our comparison of the best UK peony varieties lists bud-depth guidance for each type.

For the do-not-move list, take cuttings or root cuttings in summer instead. A £4 packet of hormone powder and ten minutes’ work beats watching a 12-year-old daphne die by degrees, as I can now confirm from experience.

Leave it alone: daphne resents root disturbance so strongly that moved plants usually die within months.

Why we recommend October over everything else: Across my 16 recorded moves, the ten October plants all survived and averaged a fortnight of summer wilting at most. The five late-winter movers survived too, but three of them wilted through July and needed twice the water. The one summer emergency move, an aster shifted in full flower for a fencing job, lost every stem and regrew from the crown. Warm soil, dormant tops and a full winter of root growth before any leaf appears: October stacks every advantage in the plant’s favour, and the results show it.

Common mistakes when moving plants

• Moving in full leaf. A June move asks a halved root system to supply a full canopy in 25C heat. Losses run 10 times higher than autumn moves. Wait for October unless the digger arrives Monday.
• Taking a mean root ball. A 25cm ball under a 1.5m shrub leaves 80% of the feeding roots behind. Measure the spread, divide by three, and dig that circle even if it doubles the work.
• Replanting too deep. Even 5cm of extra soil on the stem rots bark and suffocates surface roots. Match the old soil mark exactly; peonies and roses punish depth errors hardest.
• Backfilling with pure compost. The plush pocket stops roots exploring native soil and holds winter water like a bucket. Use the soil that came out, with compost only as a thin mulch on top.
• Stopping the water in August. The biggest killer in my notes. Roots are still tiny when the school holidays start; a moved shrub needs its 10 litres a week until the September rain takes over.
• Moving the unmovable. Magnolia, daphne and broom head the list. No technique rescues a snapped tap root, so propagate or replace these instead.

Frequently asked questions

When is the best time to move shrubs in the UK?

October to mid-March, while plants are dormant, suits most shrubs. Autumn beats late winter because soil at 8-12C lets new roots grow before leaves return. Evergreens prefer early October or April, when wind is gentler. Never move anything in full leaf between June and August unless the plant is doomed where it is.

How big should the root ball be when moving a shrub?

At least a third of the branch spread, and 25-30cm deep. A shrub with a 1.2m spread needs a 40cm root ball, which weighs 30-40kg in wet soil. Older shrubs need more: aim for 60cm across on anything past eight years old.

Can I move a shrub in summer?

Yes, but expect setbacks: summer moves lose roughly half their foliage. Only move in June to August if building work or a house sale forces it. Take the biggest root ball you can lift, cut the top growth back by a third, and water 10 litres every two days for eight weeks.

Which plants should never be moved?

Magnolia, daphne, broom and tap-rooted perennials usually die after moving. Tap roots snap when lifted, and these species cannot regrow them. Oriental poppies, lupins and sea holly are the common tap-rooted casualties. Take root cuttings or buy a replacement instead.

Do peonies really die if you move them?

No, herbaceous peonies move well if replanted at the same depth. The myth comes from planting too deep afterwards. Set the buds 2.5cm below the surface and a moved peony flowers again within two years. Bury them deeper than 5cm and the plant sulks indefinitely.

How long does a moved shrub take to recover?

Most shrubs re-establish fully within 12-18 months of an autumn move. Expect reduced flowering and some midday wilting in the first summer. Growth usually returns to normal in the second season. Anything still wilting after two summers took too small a root ball.

Moving plants slots neatly into the autumn rota alongside bulb planting and border tidying; our guide to autumn gardening jobs lists the full October workload, or browse the how-to section for every practical guide. Not sure where everything should go? Our garden audit guide maps sun, wind and frost before you dig.