Right now, dwarfs farm with silt washed downshore by the cave river and water the plants once a year. The doesn't make much sense for dwarf made floods and the second doesn't make sense at all. I suggest a change to the way farming works:
First you would build the farm plot. Either you build on dirt/slit or you pick a "soil" from the farm plot menu and your dwarfs will put it in the plot as a replacement. The soil can be any or all of the following things:
Dirt: Dug up outside, cheap and easy to find.
Silt: Dug up near rivers, plants grow better on it than in dirt.
Cave moss: A new plant that can be grown quickly and cheaply on damp rock or an farm plot with without anything to grow on. Grows naturaly on the banks of
underground water sources or farmed.
Refuse: Dead things, vermin, animal fat, ect. Realy easy to get ahold of, but using this for farming results in misima and a toxic moss growing on some tiles of the farm.
Sawdust: Easy to get, in mass, from a shop that uses wood.
Potash: Made from wood, good for growing. Mushrooms can't grow in pure potash; you need some other type of soil mixed in.
Better soil results in more plants. Soil, nor farm plots disapear over the winter, but will deplete. You can order new soil added at anytime.
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Once you have something for the mushrooms to grow in, you can set an option for your dwarfs to water them or not. Water comes from wells or rivers/lakes in a bucket. If you let them water the mushrooms, they produce more plants per tile. Most plants have a minimum amount of water and soil they need in order to grow at all.
Plump helmet: Requires moderate amounts of soil and water for moderate amount of food and wine. Good general crop.
Cave wheat: Little soil and some water, makes flour or some beer. Grows fine in outdoor soil. Good if you lack good soil.
Sweet pods: Needs alot of soil and water, makes alot of syrup, sugar or rum. Good if you have plentiful water and soil.
Pig Tails: Little soil and little water. Little ale but makes good amounts of cloth.
Quarry Bushes: No soil and little water, makes a decent amount of food but no booze. Good for places with little water.
Dimple Cups: Normal amount of soil and water, makes dye.
Cave moss: Only needs water, makes soil. Springs up on damp rock naturaly.
Black moss: Only grows on refuse, needs water. Produces a toxic extract, but is otherwise useless. Springs up on refuse naturaly.
[ September 29, 2007: Message edited by: Grek ]