|These lilies were moved to full sun. They are much more of a presence and have twice the number of buds.|
Plants like to cast shade.
As a garden grows and changes, the quality of light changes. Small changes in the shade canopy can remarkably change the ability for nearby plants to thrive.
My garden is a mature one. Things that bloomed beautifully when they were once planted are now struggling to just survive. The good part of this is the weeds have a harder time to even germinate.
I have read somewhere that a 1% reduction in the shade canopy results in 10% more light reaching the ground. There is also this British study regarding full sunlight plants which receive up to a 25% reduction in sunlight do just as well as in full sunlight. It also state those plant in a nutrient poor soil benefit from some shade.
|The fig leaf hollyhock is having a moment because I cut back hard the trumpet vine growing up the fence behind it.|
Information like this needs to be more readily available for the home gardener.
One fallacy about plants and shade that I can attest to is that daylilies do well in full sun to part shade. Living next door to a daylily hybridizer and seeing his daylilies growing in optimum conditions: soil water, sunlight, and nutrients; I would say it is a mistake to consider growing daylilies in partial sun.
Keeping large shrubs cut back and trees strategically planted to provide shade for the gardener, but not the other plants is a challenge. Adding another shrub or tree, no matter how desired, is fraught with difficulties.