For long data runs you could use RS485 differential transmitter/receiver boards Long Data lines - WLED Project
You could also put the Esp’s close to the trees in waterproof enclosures and buy a reasonably priced wifi router or extender and locate it closer to the trees for signal.
Last option would be to possibly use a few f-amp’s to boost the signal along that 50ft. You would likely need one at the beginning, at 15-20ft and another one at about 35-40ft depending on your environment.