Why haven't my endless summer hydrangeas bloomed for 3 yrs?
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Are you trimming them every year? You're probably trimming off the branches with the buds. Read this article and see if it helps:
http://ethanseden.com/home/should-you-prune-your-endless-summer-hydrangea/
Good luck!
Check your fertilizer. There are three numbers on fertilizer bags or containers. If you use a fertilizer with a high first number, you'll get healthy plants that grow well. But they will tend to NOT have flowers. If you want flowers to bloom, use a fertilizer with a high middle number. It will make an amazing difference! Here's more about it: http://www.learn2grow.com/gardeningguides/fertilizer/basics/understandingfertilizernumbers.aspx
http://blog.timesunion.com/gardening/how-to-make-your-endless-summer-hydrangea-bloom/557/
You may be pruning too early in the season and cutting off the buds.
They need full to part sun , lots of water and an acid fertilizer .
Hydrangeas bloom on old wood. I was doing this every year on one I'd put out about 7 years ago. Moved and split it 3 years ago and read in a gardening magazine that you are not supposed to trim them (and if you have to...ONLY after they've bloomed). This summer I finally got a beautiful big pink bloom on one of them. The landscaping crew that works at the building where I work made the mistake of trimming the endless hydrangeas back late spring and the blooms were almost non-existent this year.
https://thistlewoodfarms.com/how-to-make-your-hydrangeas-bloom/
https://www.gardenguides.com/84033-make-hydrangeas-bloom.html
http://www.millionplants.com/advice/wont-hydrangea-bloom/
https://www.thisoldhouse.com/ideas/5-tips-growing-gorgeous-hydrangeas