Answer: Both spring and fall are good seasons to transplant, dig and divide and do all kinds of things with your landscape. This is because temperatures are generally mild and rainfall abundant, both of which will lessen transplant stress. If you're not inclined to get out in the cold autumn weather, you can wait until spring to do your moving and dividing. Your broom won't mind being moved in the spring. Simply dig it out, taking as much of the root system as possible, and replanting. Make sure it is planted at the same soil level as it was growing before (not too deep, not too shallow). Water it in well after replanting. Your Rose of Sharon will appreciate being moved before it begins to grow in the spring. Think of it as sneaking up on the shrub while it's still dormant (sleeping). A shrub that's been in the ground for 10 years will have an extensive root system and if you move it while it is actively growing, you may set it back for several months. If you move it while it is dormant, it will barely notice the change. As for your perennials, in most instances you can divide them by simply placing your shovel or spade in the center of the plant and cutting right through the foliage and roots. I use a garden fork to lift the perennial out of the ground and then cut them into several divisions. As long as each division has roots with some stems attached, each should recover and grow well.
Best wishes with your landscape!
Q&A Library Searching Tips