Aside from splitting from suddenly getting a lot of water, what can happen to cabbages if you wait too long to harvest? I have a few heads that are still smallish but am thinking this is as big as they're going to get. Rather than try to keep them going, should I just harvest them? (I have to get ready to PROCESS -- I'm thinking sauerkraut but it's my first attempt so I've been dragging my feet....)
Is there any indicator that says "THAT'S IT, GOTTA HARVEST NOW!" ?