Willow wood may be burned in a fireplace if it is adequately cured (dried). It produces less heat than many other woods, but it may be burned unless the tree was recently treated with pesticides. If it has been treated, it may still be possible to use the firewood, depending on what was used to treat the tree.
Is willow OK for firewood?
Willow wood is rated as fair to poor when being used as firewood. It produces less heat and causes more creosote than many other types of wood more commonly used in a fireplace. When looking for wood to burn in your indoor fireplace, consider better firewood varieties, like hard maple, birch, or oak.
Are weeping willow trees good for firewood?
Weeping willows are fast-growing trees that thrive in wet conditions but will also grow well in drier soils. ... Willows are softwood trees that are easy to cut into firewood logs. But like all softwoods, weeping willow does not burn well.