Time is how you harvest pitch. By investing time, while you hike and hunt in the woods keep your eyes peeled.
OR look around cultivated areas like apartment complexes, schoolgrounds, etc.
That's where I FINALLY found a tree that gave me a very good amount of pitch.
It was litterally dripping everywhere from it in HUGE amounts.
So I promptly took every globe I could grab, stuffed a couple mason jars with it, and then went ahead and made some pine pitch bee's wax for my strings.