Hebes offer impact and structure in the garden for minimum effort we39ve selected this slow45growing compact variety for its stand out summer flower spikes which transform from electric blue to pure white hebe 39high voltage39 performs perfectly in large pots or out in the garden proving bone hardy to whatever the british winter throws at it in fact you39ll be hoping for freezing winter temperatures which will encourage the foliage of 39high voltage39 to take on a del