here is a pic of three Japanese black pines in a seedling tray that were 30-40cm tall

the seedlings were 2 years old and tube stock when i twisted and tortured them. i had to cut them out of there little black plastic containers, they were and remain quite healthy.
oh, and i used the "air", or "cage" wiring technique. unfortunately, it was before i learned the "really really good air, or cage wiring technique" that i learned on this great site

