You could try coppiced trees: https://www.lowtechmagazine.com/2020/09/how-to-make-biomass-energy-sustainable-again.html https://www.lowtechmagazine.com/2020/09/

You could try coppiced trees: https://www.lowtechmagazine.com/2020/09/how-to-make-biomass-energy-sustainable-again.html https://www.lowtechmagazine.com/2020/09/how-to-make-biomass-... They grow faster since they already have a root structure, the size is consistent and the wood is generally straigter (the japanese have a similar technique for extremely straight cedar logs)