This study was investigated on the effect of cold treatment duration and planting depth on the dormancy breaking and growth of Liatris spicata ´Floristan Violet´ in pot cultivation. The plants normally grew and flowered, when a half of corm was exposed above the soil with 60, 90 and 120 days cold treatments, when corm was buried just under the soil with 60, 90 and 120 days cold treatments, When buried at 1.5㎝ depth of soil with 90 and 120 days cold treatment, and when buried at 3 ㎝ depth of soil with 120 days cold treatment. However, plants under the other treatments maintained the rosette form and did not flower. Although the stems bolted in some pots, the plant height and flower stalk length were short and the flowering date was also prolonged remarkably.
In spite that 60 days cold treatment is not sufficient for dormancy breaking of liatris, it can be broken the dormancy and cultivated as normal elongation of stem and flowering rate if the corm was buried in half height in the soil, just as 120 days cold treatment which is sufficient period for dormancy breaking requirement.
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