Although most books recommend pieces of clay or gravel over the holes, I prefer using squares of window screening over the holes. The screening keeps the soil in, but doesn't impede drainage like pieces of gravel will. I'm sure your windowboxes will be beautiful this year. I have a number of rose bushes with some tall stalks that do not appear to have buds on them. How do I tell if they are suckers.
Suckers sprout from the hardy rootstock and are a different rose from the variety grafted on top.
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