Are all Hydrangeas heat tolerant? - Knowledgebase Question

Ottawa, Il
Question by jtrlaw1
July 19, 2010
Our ENDLESS SUMMER Hydrangeas were planted by a local Nusery last year- they came back nicely this Spring and even in blue after aluminum sulfate applied. Now all 3 plants still have green leaves but the blooms look dead & faded from the 90+ degree weather Illinois has had for about 3 weeks- Please advise.Thanks, Jim
debby_reilly@yahoo.com


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Answer from NGA
July 19, 2010

0

Endless Summer hydrangeas can become heat stressed, especially if they are exposed to afternoon summer sunshine. Sometimes they outgrow this tendency but most often they are best grown in landscape situations where they get 4 hours of morning sun and then shade or filtered afternoon sun. Pruning off the old flowers will encourage a second flush of blooms later this summer so I'd recommend pruning away the spent flowers along with any heat damaged leaves and stems. The new growth should be just fine. Enjoy your hydrangeas!

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