How to monitor adaptation after planting

Monitoring makes it possible to tell slow adaptation from a problem of water, drainage, depth or stability. In the first two years, small corrections made early have more effect than an intervention once the crown has already lost much of its vigour.

Observation should begin on the day of planting. Without an initial record, it is hard to know whether a wound, a lean or a gap in the crown was already there.

The whole tree is photographed, along with several sides of the crown, the trunk, the root collar, the rootball before backfilling and the staking system.

The date, the weather conditions, the state of the soil and the volume of the first watering are noted.

The specimen is tied to a position and a code. In batches, this identification makes it possible to compare responses without mixing up trees.

The priority is to confirm moisture and stability.

The soil is checked at several points next to the rootball. The surface does not tell you whether the roots are dry or saturated.

It is also checked whether the level has changed after watering. Significant settlement can bury the root collar and loosen the staking.

The crown can look normal while it is drawing on reserves. The absence of symptoms does not make inspection unnecessary.

When the tree breaks bud, the evenness of the flush, the length of the new shoots and any areas with no activity are recorded.

Part of the crown may start later, especially after transport or pruning. The difference should be monitored, not written off as lost straight away.

Species and season change the reading. A magnolia, a birch and an oak do not respond at the same pace.

The schedule is adjusted to actual moisture, rainfall and climate.

If the rootball dries out between waterings, the volume is increased or the interval shortened. If it stays saturated, the input is reduced and the drainage is checked.

The point of application moves gradually outwards from the base as the roots occupy the ground.

Recording volumes avoids changes based only on the duration shown by the controller.

Density, colour, wilting, scorch, leaf drop and branch dieback are observed.

A symptom should be related to how it is distributed. Damage on one side only may point to sun, wind, a localised root problem or impact. A general problem suggests a condition common to the whole plant.

Individual leaves are less informative than the relationship between crown and soil.

The base should stay visible and free of built-up mulch.

Checks are made for abrasion, cracks, sunscald, oozing and at the points where the staking is attached.

Trunk guards are inspected so that they do not trap moisture or hide damage.

On grafted trees, the union and any shoots from the rootstock are observed.

After strong wind, it is confirmed whether the rootball has rotated or lifted.

Straps and cables must not become tight as the trunk thickens. Broken stakes or loose anchors are put right.

The system is removed when the roots provide stability, not when it becomes a visual nuisance, nor when it has already caused damage.

Maintenance must not compact the root zone with machinery, storage or repeated traffic.

Erosion, cracks, puddles and runoff are observed. The mulch is topped up when necessary, without creating a mound against the trunk.

Lawn and competitive plants should not immediately occupy the base of a newly planted tree.

Regular photographs help to compare progress. They should repeat the same angles and include context, not just details.

The description should state watering, rainfall, the date and how quickly the symptom appeared.

When moisture, stability or injuries cannot be assessed from the images, a visit in person is necessary.

Diaplant can follow up atypical symptoms through contact and occasional visits, depending on the service and the situation.

Heat and wind test the relationship between root and crown.

Observation becomes more frequent. Watering is brought forward ahead of critical periods, not started only when the leaves wilt.

Scorch, leaf drop and emitter failures are recorded.

A tree that came through the winter without problems may show difficulty only at this stage.

The roots should now be starting to occupy a larger volume, but the tree still depends on monitoring in the hot months.

Watering can become less frequent and reach a wider area. The transition is gradual.

The length of the new growth is compared with the first year. A consistent recovery tends to produce a more stable crown and a better response to heat.

Formative pruning only goes ahead when the tree shows that it is sufficiently established.

Dead or broken branches are dealt with, but no overall reduction is carried out in response to poor growth.

The decision takes species, vigour and structure into account.

The tree holds its leaves through the summer, puts on appropriate growth, does not move at the rootball and copes with progressively longer intervals between waterings.

Self-sufficiency does not mean no water at all in extreme periods. It means the roots no longer depend on the rootball alone.

At the end of the monitoring period, records are updated, staking is removed and the tree is transferred to the normal maintenance plan.

Recurring problems of drainage or space should not be closed off as if they were adaptation.

The initial period is also a source of learning. The tree’s response informs future choices of species, preparation and watering.

• Post-transplant stress
• How to water a mature tree
• Garden maintenance plan

1. European Arboricultural Standards. European Tree Planting Standard.
2. Literature on establishment and post-transplant monitoring.
3. Diaplant’s method for site supervision and post-planting aftercare.