Egads. Just saw a #permaculture recommendation of brown mustard in burn scars to remediate lead and other heavy metals.
Please don’t plant any variety of mustard in burn scars. It’s a very invasive plant that will result in vast fields of an annual that dries out by late summer leaving flashy fuels tall enough to ladder a grass fire into a canopy fire.
Mustard seeds scattered by Spanish colonizers so they could retrace their steps is a significant reason why some SoCal landscapes have changed from chaparral that burns every decade or two to grasslands that can burn every year