On the DUG server this is only part of the issue. Reports that seeds and fertilizer are being "eaten" by garden plots and static greenhouses. Appears to be an intermittent problem. I feel these are two separate issues (the watering by rain only and the seed/fertilizer swallowing), but it was requested I add a comment here anyway. I'm not a game dev, so what do I know?

You know it's bad when storage items have to be REMOVED from traders.