Can I raise garden bed without transplanting perennials?
I'm hoping to raise up my garden this coming spring. We have really compacted clay soil and poor drainage. I was thinking of raising the whole thing up 6-12" and add a mix of peat moss, top soil, and compost.
We have some perennial flowers and herbs in there though. Do I need to transplant these out and back into the garden or would they do fine coming through the extra soil? We have kale, a common sage the size of a small bush, tarragon, and thyme. The flowers are a shrub rose, a day lily, some black-eyed susans, sedum, and three balloon flowers.
Mostly, I'm worried about the balloon flowers, since they've been there for 10 years and are really well established. I've always heard they're next to impossible to transplant.