There also are propane burners used to heat the orchards. Some are even dragged through the rows to provide heat. We used to get more citrus that was frost dama

There also are propane burners used to heat the orchards. Some are even dragged through the rows to provide heat. We used to get more citrus that was frost damaged, I can't remember any in the last few years but that may just be luck/where I am buying.