Cheju native Cymbidium kanran seedlings produced in vitro were grown for 18 months in various potting medium : different particle sizes of volcanic ash soils called scoria in Cheju island, pine bark, coconut husk chip, rice hull, sphagnum moss, mixes of bark and scoria , and various leaf mold of Pinus thunbergii, Castanopsis cuspidata var. sieboldii, Carpinus laxiflora and Quercus serrata. Leaf number, its width and root length were promoted when the seedlings were planted in coarse particle (1.3-1.5㎝ in diameter) of scoria compare with medium (0.8-1.0㎝) or fine grain (0.4-0.7㎝). But new shoot number of seedlings were not affected by the diameter. Based upon the results from growth comparison of seedlings in scoria and Satsumato, the number of new shoots and leaves and the width of leaves were very similar, whereas scoria was superior to Satsumato in root number. However, scoria originated Cheju island has proved to be recommendable potting media for Cymbidium kanran seedling growers.
Sphagnum moss was most effective and coconut bark comparably good enough for the seedling growth of the cymbidium. Leaf number was higher and its length was longer in the cymbidium seedling grown in all leaf humus tested except that from Carpinus laxiflora than in scoria, Satsumato, rice hull,and barks, Growth status was also better in the humus than in other planting materials. Among the humus tested, the humus from Pinus densiflora was the most effective planting material.
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