Ushi No Tane Forum

Hey guys, I'm a bit confused as to when I can get the fertilizer for the skytree? I recieved the seedling from Gilbert in spring I am now in fall. How much longer until I can get the magic fertilizer from same? I've been contemplating on starting anew game because it's taking so long, but I don't want to lose my progress...

In the lost valley you talk too Tabitha and do her request until she make the magic fertilizer.
In seeds of memories Sam will give you for free.