A seedling of White Moth, with loose rounded hanging panicles, the florets have serrated margins.  Stems tend to be a bit weak giving a drooping habit.  In the RHS & European Trials at Wisley

Gardens found in the 28 pre 2000 surveyed:   WR

Gardens found in the 10 surveyed in 2010: ESV KAL AW

UKPlant Finder 2012: Not Listed.