Pruning Conifers

Conifers are popular garden plants that serve as natural boundaries in many Dutch gardens. These evergreen plants offer privacy and structure all year round. However, to keep a conifer hedge beautiful, dense and green, is regular maintenance necessary. Pruning conifers requires a specific approach; Mistakes in pruning can lead to bare spots that will not recover. In this blog, we explain exactly when and how best to tackle this job.

When to Prune Conifers?

Pruning conifers in winter

Pruning conifers in winter is generally discouraged. During this period, the plants are dormant and barely recover from pruning wounds.

Pruning conifers in February

Although February is often still very cold, light shaping can take place at the end of the month on very vigorous hedges, provided it is not freezing. However, it is wiser to wait until the sap flow resumes in the spring. Are you going to get started anyway? Then only do so if no severe frost is forecast, to prevent frost damage to the cut surfaces.

Pruning conifers in the spring

Spring is an excellent time for the first major maintenance. As soon as the worst night frost is over and the plant starts to sprout, you can tighten the hedge again. Preferably prune on a cloudy day; Bright sunlight on freshly pruned branches can cause 'burning' of the young needles.

Pruning conifers in the summer

The second round of pruning takes place in the summer, usually around August. This ensures that the hedge goes into winter looking neat. Pay attention to the weather here as well: do not prune during a heatwave. The sap in the conifer protects the plant, and in extreme heat and direct sun exposure after pruning, the inner branches can turn brown.

Pruning conifers in the autumn

Pruning in the autumn is just about possible in September, but after that it is unwise. The plant needs sufficient time to recover before the first night frost sets in. If you prune too late in the autumn, the pruning wounds go into the winter open, which increases the risk of fungi and diseases.

How to Prune Conifers?

For a neat result and a healthy plant, the right garden tools are half the battle. Use sharp hedge shears (manual for fine work or electric/petrol for large areas). Ensure the tools are clean to prevent the spread of diseases.

Conifer Pruning Step-by-Step Plan:

1. Cleaning: Remove dead branches and debris from the inside of the hedge.

2. Bottom wide, top narrow: Always prune the hedge in a Slight 'A-shape'. By keeping the top slightly narrower than the bottom, sunlight also falls on the lower branches. This prevents the bottom from becoming bare.

3. Pruning from bottom to top: This prevents cut branches from lying on the branches you still need to prune.

4. Keep the shears straight: If necessary, use a taut string as a guideline for a perfectly straight top.

How far can you prune back a Conifer?

Pruning conifers down to the trunk

As mentioned above, pruning down to the trunk is fatal to the appearance of the hedge for most conifers (such as the Thuja or Leylandii). The plant will not recover and you are left with a bare trunk. Only the Taxus is an exception; you can prune this back rigorously to the trunk, after which it will sprout again from the old wood. Preferably do this for a Taxus in the spring.

Topping Conifers

When a conifer has reached the desired height, you must 'top' it. This means cutting off the central growing point at the top. As a result, height growth stops and the plant will put more energy into width growth, making the hedge fuller and denser.

When to Top Conifers

It is preferable to top the hedge during the regular pruning in early summer (June). Only do this once the hedge has reached its final height or even slightly above, so that you can level it to the correct height after topping.

Pruning Overly Wide Conifers

If a conifer hedge has become too wide, you can narrow it to a limited extent. Because you cannot saw into the old wood, you can only remove a small layer of green at a time. Is the hedge really much too wide? In that case, it is often better to replace it or, in the case of a Yew, to prune it back drastically in stages (first one side, a year later the other).

Pruning Neglected Conifers

With a neglected conifer that has not been pruned for years, the inside is often completely brown and bare. You cannot make such a hedge neat and narrow again all at once. The only option is to very carefully shear the outer green tips to regain some shape. Does this no longer work? In that case, it is often more sensible to uproot the hedge and plant new plants.

By pruning consistently and taking the natural growth cycle into account, a conifer hedge remains a strong and dense boundary. Avoiding pruning into the old wood and choosing the right moments in spring and autumn are the most important factors for a garden that remains green. With proper maintenance, the conifer is a reliable and durable foundation for any outdoor space.