Editing v0.34:Grass

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{{Quality|Exceptional|04:04, 10 June 2010 (UTC)}}

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'''Grass''' is a natural [[map tile]] that is found in any biome that supports vegetation. It can grow on most [[soil]] [[above ground]]. It tends to grow quickly, as can be found by channeling an outdoor area. Its growth can indicate the impending growth of a tree. As dwarves and other [[creatures]] walk over it, they have a chance (determined by the value of the {{token|GRASSTRAMPLE|Creature}} token) of eroding it down to the base soil, on which trees and plants cannot grow. 

(e.g: Elves have grasstrample 0. Dwarves have default grasstrample, which is 5. Dragons have grasstrample 50. Ergo, a mess of dwarves milling about your entrance will wear away all the grass, eventually, while a dragon does it with every step.) 

[[Cave moss|Moss]] and [[Floor fungus|fungi]], tiles similar to grass, appear in [[Subterranean]] biomes; they will grow on underground soil and [[mud|muddy]] floors after any [[cavern]] has been breached. Livestock feed on them like they do normal grass.

== Livestock ==

Livestock require a steady diet of grass in order to avoid starvation.  As they eat, the grass is eroded as though it were trampled, gradually depopulating their [[pasture]] if it isn't large enough. As there are at most 4 bunches of grass per tile, grass that is consumed in the process of an animal grazing means that the base layer of soil is revealed until the grass grows back. There is currently no known way of determining how many of the maximum of 4 bunches of grass are present in any one tile.

== Sand and clay ==

Grass growing on a soil [[floor]] of [[sand]] or [[clay]] will prevent the raw material from being [[Activity zone#Sand_Collection|collected]] for the [[glass industry|glass]] or [[ceramic industry|ceramic]] industries.  If  grass has grown on a collection [[activity zone]] you can easily clear it by designating a dirt [[road]] ({{K|b}} {{K|O}}) on top of it.  A floor [[grate]] can be placed over a collection activity zone to prevent grass from growing while still allowing the raw material to be collected.

== Fire ==

Grass can also be destroyed by [[fire]] and [[magma]]. Creatures such as [[fire imp]]s can shoot fireballs when attacking, and said fireballs can set the grass on fire. If grass ignites, the fire will slowly spread to all connected grass, generating smoke as it burns. Fire turns grass into ashes, but not [[Ash|usable ashes]]. Anything that is flammable and stands on burning grass (if you look at it you will see "A fire") has a chance to catch fire each turn. Note that fire breath will also set grass on fire, as well as instantly turning it into ashes. Grassy [[ramp|slope]]s will not catch on fire, thus preventing the fire from spreading across [[z-level]]s.

== Variation ==

During a [[Dry season]], grass tiles on the screen change into dry grass tiles, but the effect is purely cosmetic. Also purely cosmetic, the [[d_init.txt]] file contains [VARIED_GROUND_TILES:YES].  If you don't like the grass looking like ,.`', try setting this to NO. The ground will turn into periods only.

[[File:EvilGrass.png|thumb|The wormy tendrils and staring eyes of Evil Grassland]]
In [[evil]] biomes, you may find grass made up of [[wormy tendril]]s and [[staring eyeball]]s. It acts just like regular grass for the [[livestock]] that eat it. Wormy tendrils tend to wiggle constantly and staring eyeballs will blink from time to time.

In evil biomes that are also undead areas, much of the grass is dead, like the trees. Animals will not eat the dead grass. Assign a larger area for pastures so grazers can eat the patchy still-living grass.

In [[good]] biomes, you may find grass made up of [[bubble bulb|bubbles]] and [[downy grass|feathers]]. Like their evil counterparts, they feed [[livestock]] normally.

== Relationship to Real-World Grasses ==

All "grass" types in the game apart from the four special types found in evil and good biomes are actual plants in the real world. The vast majority of them are also true grasses (this includes bamboo) or at least close relatives - rushes, sedges and cattail. The vegetation of some extreme biomes uses non-grass plants: mountain avens, mountain heather and cloudberry in mountains, baby toe succulent and pebble plant in deserts. Other notable exceptions are the marsh thistle, knotgrass and meadowsweet.

{{Plants}}
{{Category|Grass}}