Plants of the woodland under-storey have a brief growing season. It’s cut short when the trees above them develop their own leaves, shading whatever’s growing below from the life-giving energy of sunlight. So the likes of bluebells have to throw up their leaves early in the year to build up their stores.
These pictures were taken a couple of weeks ago, when the plants were showing no sign of flowers. Perhaps those are beginning to show about now, along with the increasing shade from the developing foliage canopy above.