Greenhouse

Greenhouses are a pcity modules in which herbs can be planted and picked each day by one with sufficient plant lore. A greenhouse can have up to 6 tiers where each tier can hold one kind of plant. When first built they come with two empty tiers. Fresh(?) herbs are required to plant a new tier. Greenhouses must be tilled periodically which requires water and uses ep or else their yield will fall. Greenhouses can be nurtured by someone with sufficient plant lore to increase the yield on a given tier. Higher tiers have better yields. Merchants can build tiers 3-6 where lower tiers are easier to build than higher tiers.