Can they be saved? My husband sprayed our large showey hydrangea bed with Spectracide Weed Stop for Lawns. The hydrangea are not dead but they arrested 10 days ago at a stage barely out of the ground with very small leaves that did not unfurl. Hydrangea at a remote location onn the same property are about 18 inches high. It is still spring in Wisconsin. Should they be cut down to the ground? Left alone? Will they recover? Is there anything we can do?
Specratacide is a combination of dicamba and some other herbicides (salts I think). Dicamba works by mimicking plant hormones that tell the plant to grow without stopping which kills the plant when it runs out of nutrients. Not being a biochemist, I really don’t know if your Hydrangeas will survive. Considering you are not seeing abnormal growth (just lack of growth) perhaps it is the salts rather than the dicamba that is affecting them- which I would guess are less harmful. I would try calling the company to see if they can give you more information and an idea of what could be done to help the hydrangea. A quick search on the Spectracide website gave me this number 1-800-917-5438.
You might be able to find someone from your cooperative extension who will know more.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.