Just out of curiosity, has anyone ever started a fire with a patch?
though i've seen patches from spit to heavily tallow greased fire out and on the ground smoking, never saw any start a fire of any kind but undoubtedly it surely could in a fertile scenario.
No; I've never
heard of a fire started by a patch.
Only reason I even thought of the possibility, to begin with, was the fire environment here.
Having spent about 30 years as a wildland firefighter in Ventura Co, CA, I thought I knew a fire-ready environment pretty well: flashy fuels with a high dead-load; fire-perfect fuelbed arrangement; periodic low humidities, high ambient temps, and high winds. I've seen some fire.
Then, I moved to the Great Basin: first place I ever witnessed and worked fires in such fire weather. Had never worked in conditions with a periodic (actually, fairly common) 100% PIG ("Probability of IGnition": factoring-in rH, ambient temp, fuel moisture, etc, and reaching an average probability of each individual visible blowing spark or ember WILL ignite a new piece of fire).
In conditions like that, new grass or groundcover fires don't smolder: they
run.
Real world version: I've often seen cigarette ash (not the cherry: the "cool" grey ash!) ignite smoldering fires in dry bluebell groundcover. Days like that, a whole buckaroo crew (3-4 guys all smoking home-rolled, so they - theoretically - die out before they light a fire, if your "colt" sticks you on your head) turns into temporary non-smokers, in a hurry!
So color me paranoid, but I'm takin' no chances around here: it's just too bloomin' dry to risk, most of the year.