I have an 8 year old Ficus bonsai, great shape and roots, but I can't seem to get the canopy to thicken and I am afraid to over defoliate and kill it. See comments for photos
Thickening is additive growth, which means branches/trunk(s) get thicker. Ramification is an increase in the density of leaves and branches. Defoliation is the enemy of additive growth; and cultural conditions the plant approves of + judicious pinching/pruning facilitates ramification. Now - which are you striving for?
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