I bought two buddleia this year, an "Ellen's Blue" and a "Pink
Delight." The "Pink Delight" has grown quite tall with 5 or 6 giant
plumes of flowers (each 12"-18") The "Ellen's Blue" has produced dozens
of flowering plumes (each about 6") but the plant is only about half
the height of the "Pink Delight." I planted them nest to eahc other
and it looks a little strange. The Ellen's Blue was a more mature
plant when I bought it. Can planting depth explain this behavior? Is
it the way the "Ellen's Blue" was pruned? How can I encourage the
Ellen's Blue to grow taller?
thanks.