hydrangea - Knowledgebase Question

lynn, Ma
Question by bublewrp
May 29, 2008
hi again,
second question,
I have a hydrandea and a St. John's Wart. The hydrangea did not bloom at all last season and so far no sign of blooms this year is there a food I can buy or something I can do? also the ST. John's Wart only blooms a little bit they both look wonderful and are growing nice and thick and green did I cut them back to soon last year? I cut them both back in the fall sept. usually not an issue for shrubs except roddys.
Thanks again,
Paula Brewster

Answer from NGA
May 29, 2008


The most commonly grown hydrangea (big leaf hydrangea) produces flowers on new shoots which grow from old wood. If you pruned down to the ground or if your hydrangea freezed down to the ground each winter, you may never have flowers because there is no old wood for new flowering shoots to develop on. If this is the case, you may have to replace your hydrangea with a cultivar that blooms on both old and new wood. This way you're always assured of flowers every year. Endless Summer is such a cultivar.

St. John's Wort flowers on new growth and flowers best in full sunshine. Pruning in the fall should not affect the following year's flowers. Too much nitrogen can result in lots of lush growth at the expense of flowers so don't fertilize your St. John's Wort. Aside from watering once a week and making sure your plants get lots of sunshine, there's not much you can do to promote flowering.

Wish I had more suggestions!

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