When I first move to Tucson, some 30 years ago, the house my brother and I lived at had a 35 to 40 feet high palm tree with fronds all the way to the ground in the front yard, one day we decided to trim it, with fire, lite the fronds and after a few seconds we could here a wrecking train coming but no flames about a minute passed by and then a huge explosion took place and the flames were another 40 feet high in the air, within a minute all the dry fronds were gone the flames some how dissipated and the fire trucks (2) were going crazy on how to reach the house as our street is a "u" shape and if you do not know the street you miss the turn very easily, specially if you are in a rush to get there!! by the time the firetrucks made it to the house we had the fire extincted and the yard almost clean, they asked were was the fire and we just shrugged our shoulders and they left!!! after that I decided that using a pair of pruners and a ladder is safer than fire, although I LOVE fire!!