Answer: Lacecap hydrangeas produce flower buds in July and August for the following year so pruning should be done immediately after flowers fade (since yours doesn't bloom, plan on pruning in late May or early June next year). Hydrangeas need at least 4 hours of morning sunshine in order to perform well. I think that a four year old hydrangea will also require some renovation. If you remove some of the oldest canes (down to ground level), the plant will respond by producing healthy new stems and these are more likely to bloom for you the following year. You can do this now. Any new growth it develops this summer may not bloom next year - but then again, it may. I think it's worth a try.
Hope this helps!
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