Just started playing this game again. It is now winter, and I had a storm that made my field look just like EC's.
Only about halfway through getting rid of the stumps after 3 days.
I'm beginning to see how important growing crops in the dungeons will be to complete them. I can't get halfway through without running out of RP unless I get lucky and level up mid dungeon.
Dungeon farming really helped me in more than just getting through the dungeon. In the green ruins, my entry level is devoted to long-term spring flowers (for easy access), but I have several other areas with fields full of grass (which is good, because I didn't have quite enough fodder to over-winter my monsters), which MORE IMPORTANTLY gives me a ready supply of RP-replenishing crystals. The best thing about the grass is that, even if I need to cut some down, it's fully regrown and supplying crystals again in just two days. Makes a quick trip to replenish my RP after de-stumping my field much easier. Then, more de-stumping. And more. And more! Thanks, winter storm!
I actually plant a ton of grass in my above-ground field for runey management too. Because of this, I've got two areas in prosperity, the rest are decent, and even after redistributing runeys, it doesn't take long before I'm fully-stocked (60's the max in any area) at my homestead again.
Also, I was surprised at how fast re-harvestable vegetables grow when you have multiple areas in runey prosperity. I had yams every day through fall. I'd pick them, and they'd regrow by the next day. That was pretty nice.
All in all, though, I have to agree with the majority that runeys are a gigantic pain the rear.