Roscommon,
Ireland 
My white lilac is a little leggy, when would be the best time to prune it back.
13 May, 2012
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Hi
How tall and how old is your lilac ??
Best time to prune is October/November but if frost is forcast dont !! leave a couple of days
If a old specimen and over 5/6 years you can cut right back down , if younger and if multi stemed I would just take out maybe two or three , Lilacs are hungary plants and would like a feed in the spring of a general fertiliser .
They are known to get leggy one of the drawbacks if not pruned regulary
Gg
Gg
13 May, 2012