This resin-impregnated heartwood becomes hard and rot-resistant. The joints where limbs intersect the trunk, can also be harvested. Most resinous pines can produce fatwood.
Fatwood is scar tissue of a damaged or injured pine tree, according to Forestry Forum. A lightning strike will scar a tree sometimes top to bottom without necessarily killing the tree. The result scar of burnt bark will “scar” over with resin. Once hardened, the wood and bark around the area becomes rich with the flammable hardened resin. Again, resin will harden forming “scar” tissue rich in fatwood. Hard yellowish resin can be found around the wound area. This can then be scraped off and used as a fire starter
So if you’re in a forest with pines, you should be able to find pitchwood. Here’s where to look:
Find a dead branch on a living tree: This is usually the easiest place to find pitchwood. Saw the branch off even with the trunk, then saw off a three-inch chunk. That will probably be pitchwood, and you can split it into tiny pieces to help get the fire lit.
Stumps: A retired forester friend of mine told me to look for old stumps that were about waist high. That indicates the tree was cut in about the 1930s with a hand crosscut saw. In other parts of the country, just keep an eye out for old pine stumps. If they haven’t rotted, there is a chance there may be some pitchwood in the middle.
Pine knots: These are the preserved branch parts of an otherwise rotted tree. Because they are impregnated with resin, they last a long, long time, and you may be able to pick them up off the forest floor.