Planting a tree with rootball in autumn: step by step

Why plant in autumn? The best season for a tree with a rootball

October and November are the best months to plant a tree with a rootball. The soil is still warm from summer, so roots keep growing, while the tree itself slows down above ground and puts its energy into roots instead of leaves. Autumn and winter give those roots months to establish before the heat and dryness of the following summer arrive. Bare-root trees are also planted in this period, but a tree with a rootball is easier to establish: it carries more root mass and has a much higher chance of taking. You can still plant until March.

This guide takes you step by step through planting a tree with a rootball properly. The key lies in three things: a wide planting hole, removing the rootball wrap, and giving enough water in the first two years. Get those three right and almost every tree succeeds.

The planting hole: wide, and no deeper than needed

The most common mistake is digging the hole too deep. A tree always settles a little after the first heavy rain. That settling breaks roots, traps air pockets around the rootball, and lets the tree die from the inside out. Rule one: the hole should be roughly as deep as the rootball is tall, if anything a centimetre shallower rather than deeper, so the root collar sits just above ground level once the soil settles. Measure your rootball. If it is 80 centimetres tall, dig about 75 to 80 centimetres deep, never deeper. Dig deeper and the tree sinks into loose soil it can never climb back out of.

The hole should be at least two to three times as wide as the rootball. If the rootball is 60 centimetres wide, dig at least 120 to 180 centimetres wide. That sounds enormous, but a narrow hole means compacted soil that roots cannot push through. Mix the excavated soil with some compost so roots can spread in every direction. On gravelly ground dig even wider; on clay you can go slightly narrower but keep at least double the rootball width; on sandy soil you can work a little tighter, since sand compacts less.

Removing the rootball wrap: the difference between taking root and dying

Your tree arrives wrapped in fabric around the rootball. That wrap has to come off, even if the label claims it will rot away by itself. Set the tree in the hole, loosen the wrap at the top and sides, tear it open and pull it off or work it out from underneath. The rootball will lose some soil in the process, which is fine: exposed roots grow straight out into the surrounding soil, while roots left inside the wrap circle around and eventually strangle themselves. Plastic mesh is worse than jute: jute breaks down within a year, plastic never does. Wire baskets can stay in the ground, but cut them open at least halfway down so roots can grow through.

The tree stake: support at the base, not above the crown

Only stake a tree if it is taller than two metres or stands in an exposed, windy spot. One stake is enough, driven in at roughly a 45 degree angle so the trunk can still move. Two straight stakes on either side hold the trunk too rigid and stop it from building its own strength. Use hardwood such as oak or sweet chestnut, never freshly cut green wood, which bends and rots faster. The stake should reach to just below the crown, usually about 1.5 to 2 metres above the ground, never taller than the tree itself: above the tie, the trunk needs to sway freely in the wind to grow strong. Drive the stake at least 60 centimetres into the ground. Tie the trunk with a wide, soft strap, never rope or wire, and leave it loose enough that the trunk can still move gently.

Watering: the first two years decide everything

A newly planted tree has no roots yet outside its rootball and cannot search for water on its own. Give it 20 to 30 litres straight away at planting, spread over a few sessions so the water soaks in properly. Through October and November, soil in Belgium and the Netherlands is usually damp enough on its own: check under the mulch, and if it feels dry a hand's depth down, add 10 to 15 litres. From April to September, especially in dry spells, water weekly with 15 to 20 litres, more often in a heatwave. The first winter is the least predictable stretch: in February and March, wind picks up, the sun comes out, rain stays away, and the soil is still half frozen. The tree cannot draw water from frozen ground but still loses moisture through buds and bark. Watering right then, even if the soil looks wet on top, is cheap insurance. Keep half an eye on the tree in its second year too, especially through a dry summer.

Distance to the house and neighbours: decide now, not later

A tree planted two metres from the wall will be brushing the roof within ten years, its roots will reach the foundations, and every autumn it gets cut back into a misshapen pole. As a rule of thumb, keep at least half the tree's expected mature height as distance from the house. If your tree will reach ten metres tall and six metres wide in twenty years, plant it at least five metres from the wall. Roots grow deeper and wider as the tree matures and draw water out of the surrounding soil, which can make clay shrink. Fast-growing, thirsty species such as willow (Salix) and poplar (Populus) have no business standing close to a wall at all. Keep distance from the boundary with neighbours too: branches may cross over, but roots pushing into next door's soil cause real arguments. A bit of extra distance avoids all of that.

Improving the soil: preparation decides the outcome

If the soil in your hole is hard and stony, dig about five centimetres deeper than the rootball and fill that layer with compost. That breaks up the compacted subsoil and gives roots something loose to grow into. On heavy clay, replace the top twenty centimetres of soil with garden soil or compost. It takes extra time, but by year two the difference shows: trees in poorly prepared soil lag behind for years, while trees in prepared soil pull ahead noticeably faster. On clay, add at least ten centimetres of mulch on top; on sand, just water more often instead.

Choosing the right tree for your garden

Not every tree suits every garden. Silver birch (Betula pendula) and black locust (Robinia pseudoacacia) grow fast and stay relatively narrow, which suits a small garden kept at a safe distance from the house. Ash (Fraxinus excelsior) also grows quickly, but many nurseries now advise against it because of ash dieback disease. Oak (Quercus robur) grows slowly but becomes enormous and very old, so it only belongs in a large garden. For a small garden, a Japanese maple (Acer palmatum) is usually a far better choice than a field or sycamore maple, which can grow much larger than people expect. Not sure a tree will fit your own garden? On gardenworld.app you can see it first in a preview of your own garden before you decide.

Step by step

Step 1: Prepare the planting hole

Measure the height and width of your rootball. Dig a hole roughly as deep as the rootball is tall and two to three times as wide. Set the excavated soil aside and loosen the base of the hole with a spade.

Step 2: Remove the rootball wrap

Set the tree carefully into the hole. Tear the wrap open at the sides and top, then pull it off or work it out from underneath. Exposed roots near the top are a good sign.

Step 3: Backfill and firm up

Fill the hole with the excavated soil, mixed with compost if the soil is poor. Press down gently with your foot, never stamp it down. Firm enough that the tree does not wobble, loose enough for roots to spread.

Step 4: Stake and tie

Drive in an angled stake next to the tree if needed. Tie the trunk loosely with a wide strap up to just below the crown, so the top can still move.

Step 5: Water and mulch

Water with 20 to 30 litres straight away. Spread a 5 centimetre layer of mulch around the tree over at least a one metre circle, but never against the trunk itself.

Frequently asked questions

Should I cut the roots when planting?

No. That old piece of advice is wrong. Cut roots heal poorly and give fungi an easy way in. Gently loosening the outer edges of the rootball is fine, deliberately cutting roots is not.

Which tree grows the fastest?

Birch and black locust grow relatively fast while staying manageable in size. Oak and beech grow slowly but live for centuries. Choose based on the space in your garden, not on impatience.

Can I plant a tree in spring instead?

Yes, but with less chance of success than in autumn. Plant as early as possible, before the leaf buds open, and water more often through the first season, especially in warm weather.

My tree is not growing after planting, what now?

No visible growth in the first year is normal, the tree is building roots before it grows above ground. Prune only dead or damaged branches in the first year and leave the rest for later.

See it in your own garden first

Upload a photo of your garden on gardenworld.app and see a free preview of a new design with the tree you have in mind. Want the sharp image with a matching plant list? That costs a one-time 7.99 euros, with no subscription.