The variety-specific flowering time plays a key role in the pruning of Spieren. Timing and pruning depend on whether it is a spring or summer flowering spirea. These instructions explain the connections so that you can cut spiraea correctly.
Regular thinning promotes flowering
Prune summer bloomers in spring
In the summery garden, the Japanese Spiraea (Spiraea japonica) and the Red Summer Spiraea (Spiraea bumalda) display their furious blooms. The buds for the floral spectacle lay the spars on this year's shoots. With this habit, the flowering shrubs make life easy for the gardener. A vigorous pruning in early spring sets the course for lush flowering from summer to autumn. How to cut correctly:
- The best time is from the end of January to the end of February
- Recommended cutting tool: pruning shears or pruning shears with bypass mechanism
- Ideally cut back all shoots to 10 to 20 cm
- Optionally blend a little more moderately by a third
This pruning is typical of many well-known summer-flowering shrubs, such as butterfly bushes. The task of vigorous pruning is to create space for the young wood, because this is where the most beautiful blossoms unfold.
Thin out spring bloomers every 2 years
In April and May, early flowering spars transform beds and balconies into a picturesque sea of blossoms. Premium varieties are bridal spirea (Spiraea arguta), lavender spiraea (Spiraea vanhouttei) and ash-grey spirea (Spiraea cinerea). The spring beauties lay their buds on the shoots of the previous year. This circumstance prohibits a vigorous pruning, as is advisable for the summer-flowering varieties. You can promote flowering and vitality with a thinning cut at 2-year intervals. How to do it right:
- The best time is after the end of the flowering period
- Cut off a third of the oldest skeleton shoots at ground level
- Cut back this year's growth on overly long branches
- Cut a few millimeters above an alternate pair of leaves
By cleaning out withered inflorescences, a spirea can be encouraged to rebloom slightly. Place the scissor blades 3 to 4 millimeters above a pair of leaves or a bud.
Perform tapering pruning in winter
Without an occasional pruning, your spirea will lose its willingness to bloom because a dense network of shoots shade each other. A radical taper cut will fix the problem. Cut back all shoots to knee height during the leafless winter period. Thin out dead wood at ground level. To protect our endangered bird life, the Federal Nature Conservation Act permits rejuvenation measures on trees and shrubs in the period from October 1st to February 28th.
tips
Although its name suggests the opposite, the bladder spar does not belong to the genus Spiraea, but is assigned to the genus Physocarpus. The deciduous deciduous shrub, also known as pheasant spar, grows up to 4 meters high and blooms in June and July. As a summer bloomer, the time window for shaping and thinning opens in late winter. In contrast to summer-flowering spirea varieties, the flowering shrub benefits from a less vigorous pruning by a third or half.