While your trees are growing out and the roots are pliable go ahead and create some small groups... clusters of 2 or 3 trees. Different sizes and i will typically look for ones with similar movement and plant them with their bases touching....very close together. Then spend a couple years developing the clusters and singles as JKL suggested.
I have the footage to create a progression video of some Japanese maples that I developed as described but also planted them through cds to develop better bases....took about 4-5 years from one year old seedlings to first arrangement....but there is absolutely no way that i would have the same quality forest now if i had put them together as seedlings. Ill try to get it together and post sometime in the near future.
Cheap pots for groups...use seedling trays...stack two together to improve rigidity... I also use plastic oil pans with holes drilled.
But, in my opinion you are far better off developing the material individually....particularly in respect to achieving a flat and thin root pad....much easier to assemble than seedlings with no roots...when i have had forest or trees in groups fail, it has almost always been due to fact that the roots were not adequately secured.
I have the footage to create a progression video of some Japanese maples that I developed as described but also planted them through cds to develop better bases....took about 4-5 years from one year old seedlings to first arrangement....but there is absolutely no way that i would have the same quality forest now if i had put them together as seedlings. Ill try to get it together and post sometime in the near future.
Cheap pots for groups...use seedling trays...stack two together to improve rigidity... I also use plastic oil pans with holes drilled.
But, in my opinion you are far better off developing the material individually....particularly in respect to achieving a flat and thin root pad....much easier to assemble than seedlings with no roots...when i have had forest or trees in groups fail, it has almost always been due to fact that the roots were not adequately secured.