Renewal pruning is a horticultural technique used to encourage the growth of new branches in tree peonies. During this process, all existing branches are trimmed from the soil surface, allowing new shoots to emerge and develop. The goal is to promote straighter and thicker growth, enhancing the aesthetic appeal of the plant and increasing the number of branches, which in turn increases the yield of flowers. Peonies are relatively easy to manage using renewal pruning, making it a popular technique among professionals and enthusiasts alike. When is renewal pruning appropriate for peonies?
Branches that exhibit short and stout growth characteristics are generally not considered desirable in terms of both appearance and commercial value. These branches often result in an unattractive plant shape and are typically recommended to be pruned into flat stubble. Branches with uneven height and thickness, particularly those with a greater number of small branches, are encouraged to produce more flowers. However, when high-quality branches are lacking, it is essential to implement a flat renewal pruning technique. This process is outlined as follows:
The height of the renewal pruning is approximately 3 centimetres above the ground, at which point the upper stem is cut off. Mulching can be performed after stubble levelling, with the mulch being applied to cover the stubble branches. Renewal pruning can be completed in the fall, from frost to the beginning of winter. At this time, the temperature has dropped, and the seedlings will not develop in the fall. Therefore, it is the optimal time to level the stubble for peonies.
Once the renewal pruning has been completed, it is essential to seal the peony promptly. The soil should not be overly thick, and the renewal pruning, branches, and side buds should be lightly covered. Covering the soil will help facilitate a smooth overwintering process, as the peony will be winterized shortly.
However, it is important to note that flowers will not be available in the first year following the peony renewal pruning procedure. This is because the new branches are relatively young and have not yet reached full maturity. As a result, they have accumulated fewer nutrients and require more than a year of cultivation before they can bloom. Therefore, if flowers are desired in the next year, it is not necessary to perform a renewal pruning treatment at this time.
English