One must prune in period of rest (lignification in August, when the tree gets ready for winter, and until winter, before the hatching of flowers).
The sap-wood includes channels (the xylem) which will drive the going up raw sap towards leaves, during some years, before lignifying (it becomes waterproof), by annual layers at the end of summer (it is the '"lignification").
After the withering in a mild winter, the warm start of spring brought sprouting forward by almost 10 days.
It is preferable to prune trees in the Rosaceae family (crabapples, mountain ashes, hawthorns, etc.) in spring, because pruning in fall can interfere with their hardening off in readiness for winter.
The resistance to cold is excellent and is probably also increased by the lack of vigor of the new growth in Spring and the fast hardening of its wood in Summer.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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