Quote:
Originally Posted by WaterAndWindSpirit
(Some wizards had to have experimented to develop some kind of harvest enhancing spells, it just doesn't show up in the source books because the PC party is assumed to be a paramilitary unit, not a group of farmers.)
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PLANT GROWTH
3rd-level transmutation
-snip combat effect-
If you cast this spell over 8 hours, you enrich the
land. All plants in a half-mile radius centered on a point
within range become enriched for 1 year. The plants
yield twice the normal amount of food when harvested.
It's a druid/ranger/bard (+ nature aspected clerics and paladins) spell. Since it's third level you'll need a fifth (ninth for ranger/paladin) level caster. They could cast it twice over 16h then sleep 8h to regain the spell slots.