hard to describe

hi guys / ladies, ive just bought 3 hydrangea mophead shrubs(very small) and planted them in a row, the thing is ,all three are shaded by a fence in the morning but when the afternoon one comes the sune goes behind my shed and casts a shadow over 1 so it seems to be reaching for sunlight  and growing faster than the other two , is there any way to help the other 2 catch up  please help thnx