I live maybe 2500 km south of you. When exactly do you plant trees in your part of the world? I'm guessing you wouldn't chisel through frozen ground (something that hasn't happened here in Austin in about 40 years), but is it exclusively a summer activity? Do you grow your saplings in greenhouses? Am I really asking to see some article you have already written. Anyway, I'll be following you. You seem like an interesting keeper of the earth who just might teach me a thing or two.