Here is my buddleia. It was planted in the Autumn having been grown in a
pot from a cutting. It's 30 inches high.

http://imgur.com/zyUhw

Ultimately I would like this to grow as big as possible to attract
butterflies in the late summer so is it best to just leave it this
spring? I know more mature buddleias benefit from spring pruning but as
this is so small should I leave it? Advice appreciated.