Rush Wood
Location
When using a Wild Growth Rune.
General Properties
Walls
Field Properties
Other Properties
February 18, 2002
Notes
It also exists in a lighter color: 
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On Open PvP and Retro Open PvP worlds, its color varies depending wether the caster and the viewer are on an active PvP situation or not. On Hardcore PvP and Retro Hardcore PvP worlds it's always dark, whereas on Optional PvP worlds it will always appear with the lighter color.
It is similar to the Magic Wall (Object), although one can shoot through a wild growth wall and not through a magic wall. They can be destroyed with Machetes, Heavy Machetes, and any of the Secret Agent Tools on all PvP worlds, and by walking over them on Optional PvP worlds.
History
These were not destroyable on PvP worlds before the 2009 Summer Update. The yellow version was implemented with the 10.00 Update and became destructible with the 10.01 Update.