Q.My Lilies Of The Valley Are Not Doing Well.
I have a healthy supply of leaves, under a large holly tree, that is near a large silver maple. I think we keep it relativeIly watered. It was a very mild winter around Washington DC. I believe my lilies of the valley are a pink variety. Very few flowers have come out and the ones that did, look shriveled. I have transplanted them a year or two ago because they weren’t doing well in the previous location either. What might they need.

Certified GKH Gardening Expert
The silver maple may be sucking up all the water and nutrients. Also, lily of the valley must be established to bloom and since it was moved, it has to reestablish. Be sure to keep the soil moist but not soggy. You may have to water more because of the silver maple. These articles should help:
https://www.gardeningknowhow.com/ornamental/bulbs/lily-of-the-valley/lily-of-the-valley-not-blooming.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/trees-with-invasive-roots.htm
https://www.gardeningknowhow.com/ornamental/bulbs/lily-of-the-valley/growing-lily-of-the-valley.htm