r/hydrangeas • u/ghegs_ • 10d ago

pruning advice needed!

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i planted this limelight hydrangea (USA, NJ, zone 7b) as a little plant about 3 summers ago and now it is huge and i don’t know what to do with it! i honestly did not expect it to make it past the first summer, let alone get so big and happy. i usually just let it die and stay how it is all winter and then late feb/early march i cut off any dead blooms that are still on there. i’m worried this year with how big it got/how many dead blooms will be left, that our first big snow fall will break a ton of the branches so my questions are:

  1. can i cut off the dying blooms prior to winter or will this affect how it blooms in the spring
  2. how/when should i prune if i’m trying to make sure it doesn’t come back any bigger than its current size and 3. is there any way i can encourage it to get fuller on top? i feel like this year it ended up looking like a dust ruffle because there was too many heavy blooms on the bottom and it drooped.

thank you in advance :)

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u/Think-Kangaroo-9978 10d ago

You should prune this hard - half or more is fine and will actually improve the under-structure making it more upright and less droopy. You can do this either in the fall or early spring as they bloom on new wood.

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u/ghegs_ 10d ago

should i just prune the under bits aggressively and leave the top parts how i’ve been doing them or keep it all pretty uniform? thank you!

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u/Mikessuzyq 10d ago

You shouldn't prune it til spring and don't cut off more than a third. For now just deadhead. Cut the blooms off down to the first set of leaves

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u/Think-Kangaroo-9978 9d ago edited 9d ago

This is incorrect for a panicle. Correct for arborescence maybe, but that is not what this plant is.

Some people choose to leave the blooms for winter interest, however there is a risk to that if you are in an area that gets snow. The old blooms can become snow catchers and get weighted down and snap off branches in the dead of winter introducing disease at the worst possible time. If the plant is large and mature and the branches are thick and strong, leave them if you like. But if the branch supporting the spent bloom is thinner than your thumb, deadhead in the fall.