A tree canopy in full leaf takes all the light away form the Forrest floor where the bluebells grow and as all plants need light to grow the bluebells must therefore grow and flower before this happens.
One could say why don't they leave it until after the leaves have come off the trees in autumn? If they did this then they would be starting to grow and flower in winter when the temperatures and weather are inclement and the amount of sunlight is falling to its minimum as the sun moves south.
Blue bells are deciduous plants and they lose their leaves because they only need them to produce food, but during winters, their is lesser sunlight and so they do not need leaves in that season.
new flowers bloom
trees.
Pussy willow trees typically bloom in late winter to early spring, usually around March to April. Blooming happens before the leaves emerge, with fluffy catkins covering the branches to disperse pollen and attract pollinators.
The trees will bloom again in the spring!!
Oak trees usually bloom in North Carolina in April.
Wildflowers, trees, duckweed
When you prune trees, they bloom because energy reserves are made to serve the branches.
In a grassland there are.... Grass, Shrubs, Few Trees, And Wildflowers...
in 50 to 100 years the rothin bamboos bloom
Dogwoods typically bloom around April 15th.
wildflowers, cacti, Joshua trees, Ocotillo, duckweed, and many more!