Oh, okay, good to know. They're just starting to bloom now, and in past years most of the clusters fall off afterward. I thought it could be some disease, since one of them gets a fungus every year, but the other seems immune to it, and I still lost most of the clusters. This year I worried they might not be getting properly pollinated. But we have plenty of breezes, so I'll see what happens.
Any recommendations to prevent the rusty fungus?