New lilac bushes don't require maintenance pruning until they are about 6 - 8' tall. The time to prune mature lilac plants is just after the flowers have faded. They set the next season's flower buds almost immediately, so late pruning will mean sacrificing next year's flowers. Pruning early also gives the new shoots more energy to develop.
After flowering.
it depends what season it is...
The best time is after the first frost and before the last frost of your region. This is because you want to transplant when the plant is dormant.
Spring
Ok here is the scoop, how to transplant rasberry bushes per Grandma Junker, who after years we are replanting her original bushes. you want 2-3 sticks per bush/plant, plant bushes 4-6 inches apart digging hole 6inches deep aprox. and adding just the cheap bags of manuar for fertalizer in each hole. plants should be around 6inches in height (cut lower for less berrys this year and more next) I left mine long? tmcconaughey@stillwaterauto.com
They need to be planted and/or transplanted in the spring. Wait until the ground is thawed fully and just about ready to receive tender annuals (after the last frost). Also FYI: if in the late summer, you bend the tips of the canes over (the first year canes that grew this summer, not the second year ones that produced berries this year), and pinned the tips into the soil, they will grow roots for transplanting. The following spring, you can transplant those new plants after clipping them off the parent plants for easy propogation!
The best time to transplant a peach tree is January. The trees are still dormant from the winter, which will reduce the shock of transplantation. It is also best to transplant a peach tree when it is at least one year old and preferably not after they reach three years old.
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with today's modern transplant procedure healing can occur within a matter of days after the patients procedure, however in some cases healing can take a few weeks for numbness or soreness to go away. One can expect result of hair transplant surgery within a year time when all hair will grow completely.
The usual answer is immediately after they have flowered. If you prune them more than once a year they are called a hedge.