plant them on wind day, plant 2 dark crystal.. and harvest on eath day... i plant 3 actually in brass pots... i got 18 darksteel nuggest and 7 light crystals... pretty good investment.
ok so for the question of what to do in planting tree cuttings.. plant on darksday right aftrer full moon. it will give you the option to feed it a crystal 2 times.. both times do not feed it any crystals. it will say.. it doesn't look good but don't worry it won't matter.. it will be fine next day u check it.. just check twice a day RL and it will give you 1 to 2 tree saplings.. u can use those to garden other things or just sell on AH for nifty price :)