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Pull the tree out by its trunk, keeping it on its side. 5 Slice off the compacted roots at the bottom and around the circumference of the plant with a sharp, clean knife, removing at least 1 inch. May 16, Ficus tree pruning needs to take place when the plant is no longer actively growing.

Vertical branches can give your tree a bulky, awkward shape.

Most plants are vegetatively active in spring and summer, with growth dying down in fall. By winter, the plant has gone into dormancy and is less susceptible to injury. Therefore, winter is the best time for trimming ficus trees.