lillies with yellowing leaves
I planted some lilies a few years ago in two areas of the garden.The 3 I planted in one border were fine for the first couple of years but last year they all grew to full height, went yellow and droopy and shrivelled up. I thought the border might have become too shady as other plants had got bigger so I moved them into the second border where lilies were doing well. However, the same thing has heppened again. I couldn't see anything wrong with the bulbs when I dug them up and moved them. Any ideas about what could be wrong?