What if trees after a long duration of time (like at least a RL week) level up again, providing possibly much more yield and having possibly other perks. This could help in highly trafficked areas like East and West Spice where the trees are always running out of spice. Also Ferilitdust should have no or very little effect on obtaining the last stage. It would create a greater moral dilemma for people who like to kill and replace trees (not knocking doing this, I'm about to start myself in order to get some badges). Currently if you carry enough Ferilidust there is effectively no effect to just randomly replacing trees. To help prevent greifing maybe make the count down timer on the "Ancient Trees" much longer time period than normal to give people more time to save them (like 5 to 10 minutes).