Fuel is required for any fire to burn. In regards to wildfire, fuels almost always consist of living vegetation (trees, shrubs, grass and wildflowers) and dead plant material (dead trees, dried grass, fallen branches, pine needles, etc.). houses, when involved in a wildfire, become a source of fuel. The amount, size, moisture content, arrangement, and other fuel characteristics influence ease of ignition, rate of fire spread, length of flames produced and other fire behaviors