I want to cut off the bottom to make it look more like a tree where it would show a bottom trunk. Will this work for a dwarf alberta spruce? If yes, when would be the best season to do it?
Dwarf form spruce are often used as Bonsai material. That says that the plant is ideally suitable for training and creating a well balanced design. It is recommended that spring through summer is the best time for general pruning. I personally would do branch pruning only one branch at a time and would do it only during late autumn and winter. I use sharp, clean shears or hand pruners.
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