KC,

I would transplant them either as they sprout or all at once now that they
are starting to sprout. I would also mix some grit in with the Miracle Grow
soil so it drains a bit better and is easier to remove when you transplant
the seedlings in a couple of years (I generally use a fine 1 - 3 mm bonsai
soil which is real gritty). Getting the roots spread during the early
transplantings is the biggest advantage of starting bonsai from seed.

If you are adventurous and have plenty of seed, you might let the roots get
up to 20 mm long and then cut the tip before potting. This will either
force the seedling to put out several lateral roots (instead of the root
growing long) or kill it. This technique is often taken to the extreme with
Japanese Black Pine (P. thunbergiana) where the root is cut off and the cut
surface is treated with rooting hormone before replanting.

Marty

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