Unhealthy hop vines?
We have four hop vines in our yard, and they've all grown well since we planted them several years ago. This year, two of the four barely broke the surface, looking sickly and pale (see attached photos), while the other two grew big and healthy. Question 1: What happened? Frost? Mildew? Question 2: Will these two hops grow back next season, or should we replace them before then? Thank you for your expertise. Cheers, York
Multnomah County Oregon
It's hard to say. We had a really tough winter with a couple of warm/cold cycles. You don't say whether all the hops are the same variety and that could be a mitigating factor with hardiness. OSU Extension has this publication on growing hops https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/em9115.pdf
the other thing you may want to do is have a soil test done. In researching your problem, I found that hops need boron (it's a trace mineral but it does deplete.) http://www.metromastergardeners.org/faq/index.php?action=artikel&cat=7&id=6&artlang=en will help explain how to take a sample. It will cost some $ to provide analysis for trace minerals.