What time of year to prune
Damage to roots can restrict your ability to absorb water and nutrients, so it should be done at times of the year in which the tensions in the plant are minimal. For plants of temperate climates, there are two seasons in which these conditions are good, fall and spring. Tropical plants can usually be pruned and transplanted during periods of “rest” or slow-growing.
In late autumn, deciduous plants that disrupted the supply of moisture to the leaves, are going into dormancy, with colder ambient temperatures, stresses that the heat is gone. Contrary to this cessation of activity for the upper portions of the plant, the roots once again become active. They have a full season of stored food and superior fabrics are still moving down to feed the roots. Root growth is not dependent on light, just about the food supply and soil temperatures, air temperatures are decreasing in the autumn, temperatures remain higher in the soil, the days are still warm, the earth keeps warm as it is still radiated the sunshine, this is especially true for plants that are on the ground or in contact with the earth.