Carl_Bergstrom

Kevin,

I don't have any experience working with shimpaku of this size. If they were deciduous, I'd remove most of the taproot. For these, I'd guess that you should remove about 1/2 of the tap root this year, and more next year. Hopefully those with more experience at baby shimpaku care will chime in and correct this more or less uninformed guess on my part.

Cheers,
Carl

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In love with trees