By Frankey
United Kingdom 
when to prune heather
16 Jul, 2011
Answers
Yup after flowering you can cut back pretty hard
16 Jul, 2011
In fact at Edinburgh Botanics they use a strimmer!
16 Jul, 2011
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To keep it bushy, I give the flowering stems a 'haircut' after they finish flowering. Depending on when they finish flowering that might be in spring or even later. Just prune the green growth, not the woody stems. They put on new growth very quickly.
16 Jul, 2011