Climbing knotweed (Fallopia baldschuanica) is not called “architect's comfort” without reason; after all, it is more suitable than almost any other climbing plant for quickly and effectively greening even very large areas. However, its growth also gets out of control just as quickly and should therefore be contained in good time.
How do I cut knotweed correctly?
To prune knotweed properly, remove all plant material to just above the ground in February or March and direct the new shoots in the desired direction. If in doubt, cut off shoots during the season to prevent uncontrolled growth.
Contain growth
Basically, you could stand in the garden and watch your knotweed grow - it can grow up to 30 centimeters per day and therefore several meters per month. Just as quickly as it grows, it also displaces all other vegetation - as well as numerous other things that stand in the way of its spread. Whether roof tiles, downpipes or other pipes: knotweed simply overgrows everything. So it's no wonder that you have to keep a close eye on the plant's growth and strictly limit it.
cutting back knotweed
This limitation begins in early spring when you - ideally in February or March - cut the entire monster back to just above the ground, removing all last year's shoots. The new shoots ultimately direct you in the desired direction. However, be careful that the new shoots do not move cheekily in undesirable directions. If in doubt, it is better to cut them off in the middle of the current season.
Removing knotweed
Once established, knotweed is unfortunately very difficult to remove - like all knotweeds, which can sprout from even the smallest root residues. This family of plants is extremely stubborn, so it's no wonder they're found around the world (and often a much-maligned pest). Climbing knotweed can only be completely removed if you completely dig up and dispose of the roots, which reach up to two meters deep. However, please do not put the latter in the compost, as this will only contribute to the further spread of this very robust monster.
Tip
If you want to plant knotweed, it is best to install the necessary climbing aids at an appropriate distance from gutters, downpipes and similar components. A distance of at least one and a half meters is recommended.
