Buddleja Flower Power - no multicoloured flowers only purple
Has anyone grown Buddleja 'Flower Power' from plug plants before, if so please can you give me some advice.
I bought some plug plants of Flower Power from an on-line plant supplier last year and they have just flowered for the first time. The flowers are only dark purple and not the colourful purple, pink, butterscotch etc they are advertised as having.
Do the flowers on the plants develop the multicolour flowers in following years or have I got dud plants?
Many thanks in anticipation of your replies.