Sometimes, a tree outgrows its designated area and plants underneath are adversely affected; if they show lank and spindly growth or there’s a yellowing of foliage, it probably means the plants aren’t getting sufficient light.
Begin by removing some of the lower tree branches in stages on a sunny day, so you can see the immediate effect and don’t remove too much. You may also have to thin out a few higher branches so light can filter through to the ground below.
An alternative is to move the plants to a sunny position, and to change this area into a shady woodland garden.
Source: Home magazine