Buddleia "floppy growth"

My poor buddleia has suffered due to the Spirea Bridal wreath next to it making huge growth and over-shadowing it making the Budleia very floppy. I have now cut the spirea back drastically but will the buddleia recover in time to flower? I could try staking it, would a feed help?
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buddlejas will flower no matter what. it doesn't need feed. staking it will help with the floppiness.
I'm always amazed at how quickly plants recover
In the sticks near Peterborough
Thank you. Already it looks happier.