No granite here, just 80 years of plain ol' limestone gravel. With a pH >8, a couple are very chlorotic while other marties seem to fair somewhat better.
I've been using elemental sulphur for a couple years, plus Epsom salt on the worst cases, which does help. I'd like to put a barrier between the bed and drive to slow down the migration of lime ~ something like garden edging, but would need to be about a foot deep. Plus, getting through that much rock wouldn't be any fun.
