A hedge is the most patient housemate in the garden. It grows quietly on its own, screens the view, softens street noise and, come spring, houses a whole family of birds. And that is exactly why you cannot cut it whenever the mood strikes. Between nature-protection law, the birds' breeding season and what actually does the hedge good, there are clear windows of time. Once you know them, hedge trimming becomes something you can plan rather than something to worry about.
This article explains what the German Federal Nature Conservation Act really asks of you, why the shaping cut is due at the end of June while the hard cut belongs in the winter half of the year, and how the trapezoid shape keeps your hedge dense right down to the base.
What the law actually says
The key sentence sits in Section 39 of the German Federal Nature Conservation Act (BNatSchG). In essence, it forbids cutting back hedges, living fences and shrubs, or setting them on the stump, between 1 March and 30 September. That window covers the breeding and nesting season, when birds nest and small animals seek shelter.
The second sentence, which is often skipped over, is the decisive one for you as a gardener: gentle shaping and maintenance cuts to remove the annual new growth remain allowed. That means you may keep your hedge in shape in summer too, as long as you only trim the freshly grown, soft shoots and do not cut into the old wood.
In short: the hard cut belongs in the winter half of the year, the shaping cut may happen in summer, and above both stands consideration for nesting birds. Keep those three levels apart and you will do nothing wrong.
Two windows, two kinds of cut
It helps to think of hedge trimming as two entirely different jobs. They have different goals, different tools and different dates.
- Shaping cut (summer)
The light cut that sharpens the outline and shortens the new growth. Due around Midsummer Day, so the end of June, CW 24 to 26. After this cut the hedge forms what is known as the Midsummer flush, which grows back gently until autumn and softly fills out the outline.
- Hard cut (winter)
The heavy cut into the multi-year wood, to rejuvenate an aged or oversized hedge. Only in the winter half of the year, CW 40 to CW 8, on a frost-free, dry day. Plenty of material comes off here, and the hedge looks bare for a while afterwards.
Midsummer Day on 24 June is the old gardeners' rule for the summer cut. By then the hedge has finished its strong first flush, most birds have fledged, and the regrowth stays moderate, so the outline holds clean into autumn. Cut too early in May and the hedge shoots back wildly at once, and you have to go over it a second time.
The trapezoid shape: wider at the bottom than the top
The most common mistake is the wall. Many people cut their hedge the same width top and bottom or, worse still, wider at the top because it is easier to reach up there. The result after a few years: the upper branches shade the lower ones, the base gets no more light and goes bare. A hedge that is bare at the bottom never grows properly dense again.
The answer is the trapezoid shape: broad at the base, tapering slightly towards the top, with a slope of roughly 10 to 20 degrees per side. That way light falls all the way to the ground, every branch carries leaves, and the hedge stays closed from crown to base. As a rule of thumb, the hedge may be around a quarter narrower at the top than at the bottom.
A hedge that is wider at the bottom than at the top never goes bare at the base.
Old gardeners' rule
A second reason for the sloping flank is the snow load in winter. A narrow top edge lets snow slide off instead of settling and forcing individual branches apart. This pays off especially with evergreen hedges such as yew or arborvitae: a broad, flat top gathers snow like a shelf and readily breaks apart under wet fresh snow.
To get the flanks truly straight and the slope even, a simple line helps. Stretch a guide line between two stakes at the height you want and cut the top edge along it. For the sides you can use a slanted batten as a template.
Check for birds
Walk slowly along the hedge before every cut and look into the dense inner sections. If you find an occupied nest, postpone the cut at that spot until the young have fledged.
Stretch a guide line
Two stakes at the ends, a taut line at the target height. It gives you a straight top edge that the eye cannot misjudge.
From the bottom up, then the top edge
Cut the flanks first, starting at the bottom and working up. That way the clippings fall outward and do not block your view. Hold the shears flat and guide them in calm arcs.
Form the trapezoid
Let the flanks taper slightly towards the top, around a quarter narrower up top than at the base. Step back a couple of paces now and then and check the line from a distance.
Clear the clippings
Clear away the clippings straight away. Green left lying on the hedge rots and invites fungi. Thin twigs make good shredding material or feed a dead-hedge in the corner.
The right timing across the year
To keep the dates in your head, here is the yearly cycle of a typical deciduous hedge such as hornbeam or privet:
- CW 40 to CW 8 · early October to the end of February: the window for the hard and rejuvenation cut. The hedge is dormant, you can see the branch framework without leaves, and the cut puts the least strain on the plant. Pick a frost-free, dry day.
- March to the end of June: stay calm. The hedge is growing, the birds are breeding. At most a very light outline trim of the soft tips, and only if there is no nest nearby.
- CW 24 to CW 26 · around 24 June: the main shaping cut. The first flush is done, broods are mostly finished. This is when you give the hedge its clean summer form.
- July to September: for vigorous species such as privet, a second light follow-up cut is possible, again only the fresh growth.
Which hedge takes which cut
Not every hedge reacts the same. Deciduous woody plants such as hornbeam and privet reshoot even from old wood and forgive a hard cut. With conifers you have to look more closely: yew reliably reshoots from old wood, whereas arborvitae and false cypress barely do. Whatever turns brown and bare there stays bare.
Hornbeam is the classic hedge plant for formal shaping. It is tough, cuts back into old wood without complaint, and holds its dry brown leaves well into winter, shedding them only when the new growth comes in spring. That gives a degree of screening even in the cold season.
Yew is the finest evergreen for formal hedges and the only conifer that reliably survives a hard cut into old wood too. It grows slowly but in return becomes very old and dense.
Tools and safety
For the shaping cut of soft shoots, a good pair of hand shears or an electric hedge trimmer is enough. For the hard cut into the branchwork you need loppers or a small saw. In both cases one thing is decisive: sharpness. A blunt blade crushes the shoots, the crushed ends turn brown and become an entry point for fungi.
One last practical point: do not cut in the full midday sun. Fresh cut surfaces and the leaves behind them scorch easily, especially on evergreen hedges. An overcast, dry day or the morning hours are ideal.
Common mistakes you can easily avoid
The classic is the late hard cut in spring, once a nest is already sitting in the hedge. The second is the top-heavy wall that goes bare below. The third: too little, once a year. If you want a formal hedge but only cut every other year, you are forever fighting the wild growth. A regular light cut keeps the hedge dense with less effort than the rare heavy push.
And the fourth mistake is impatience after the rejuvenation cut. A hornbeam cut hard back looks bare and sorry in March. Give it a season. By summer it is green again, by the second year dense again.
Häufige Fragen
Until when am I allowed to cut my hedge?
The hard cut, meaning cutting back to the stump or reducing heavily, is permitted under German nature-protection law only from 1 October to the end of February, so in calendar weeks CW 40 to CW 8. From 1 March to 30 September this hard cut is forbidden. Gentle shaping and maintenance cuts that only take off the fresh growth remain allowed during that time. And regardless of the date: if an occupied bird's nest sits in the hedge, you must not cut there at all until the young have fledged.
Am I even allowed to shape the hedge in summer?
Yes. German nature-protection law expressly allows gentle shaping and maintenance cuts to remove the annual new growth in summer too. That means you may shorten the freshly grown, soft shoots and sharpen the outline. What you may not do is cut into the multi-year wood or reduce the hedge completely. The best summer date is around Midsummer Day, so the end of June, CW 24 to 26.
Why should a hedge be wider at the bottom than the top?
Because otherwise the upper branches shade the lower ones. If the base gets no light, it loses its leaves and goes bare, and a hedge that is bare at the bottom never grows properly dense again. The trapezoid shape with a slope of about 10 to 20 degrees per side makes sure light reaches the ground. As a bonus, snow slides off the narrow top edge instead of forcing the branches apart.
When is Midsummer Day and why cut then?
Midsummer Day is 24 June, so CW 26. By then the hedge has finished its strong first flush of the year, and most birds have finished breeding. A shaping cut at this point stays clean for a long time, because the following Midsummer flush grows back only moderately. Cut noticeably earlier and the hedge shoots back strongly at once, and you have to go over it a second time.
Which hedge tolerates a hard cut?
Deciduous woody plants such as hornbeam, privet, field maple and beech reliably reshoot from old wood and cope with being cut back to the stump. Among conifers, yew is the great exception: it reshoots from old wood. Arborvitae, false cypress and juniper, by contrast, barely reshoot from brown, leafless wood; a spot cut hard there stays permanently bare. With these species you cut only the green, needled new growth.
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