Goro tsuchi Course soil that is used at the bottom of the pot for good drainage. Ha gari ...
Goro tsuchi The course Bonsai soil used at the bottom of the pot providing good drainage and aeration. Fukinagashi ...
You then lay course soil ("goro tsuchi") whose grain size is about 1/4"(6 mm) or more in diameter. On that you lay planting soil ("ue tsuchi") whose grain size is about 1/32"~1/4"(1~6 mm) in diameter. - Grain size in Shohin bonsai ...
 
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