Knotweed in the garden - curse or blessing?

Knotweed in the garden - curse or blessing?

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Knotweed in the garden can be both a curse and a blessing. So here's how you can cut and remove the knotweed.

Knotweed reproduces very quickly

The robust knotweed is an excellent climbing plant with which large areas can be planted extremely quickly - because during the growth phase the knotweed grows up to 30 centimeters per day. Which is why it is often planted on the edge of the public path to green the walls.

Unfortunately, the knotweed often spreads so much that it displaces other native plants and can hardly be tamed. Then from July to September the beautiful green blooming greenery becomes a problem. Especially since the deep root (up to 2 meters deep) cannot be easily removed. For example, this climbing plant can cause great damage to trees.

You now have to decide for yourself whether you want to remove the knotweed from your garden or care for it properly and keep the growth under control. Both options explained in more detail.

Cut the knotweed

From the first frosty days the hardy knotweed loses its yellow or green foliage and leaves only a bare branch. Before it forms new leaves again in the coming spring, you should cut it back with courage. The ideal time for this is February to March. You should then use pruning shears to cut back the knotweed.

Afterwards it is important that you set up climbing aids for controlled knotweed growth. However, these must be particularly stable since the knotweed is a fairly strong creeper.

Remove the knotweed

With chemical herbicides, you can of course effectively knot the knotweed. However, this measure has the disadvantage that the ecology around the plant is also out of balance. In principle, there are only two ways to remove the knotweed:

»Dig up the garden:

The knotweed root system has often branched underground. To completely remove the plant, you must therefore completely dig your garden.

»Hot water vapor:

Another way to remove them is to fight the knotweed (especially the roots) with hot steam. However, living things that are in the immediate vicinity of the plant are also damaged or even killed.


Afterwards, you should never dispose of the removed plant parts in the compost, otherwise they could end up in the garden again and spread again.