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Stratification (botany)
In horticulture, stratification is the process of treating stored or collected seed prior to sowing to simulate natural winter conditions that a seed must endure before germination. Some seed species undergo an embryonic dormancy phase, and generally will not sprout until this dormancy is broken. The time taken to stratify seeds depends on species and conditions; though in many cases two months is sufficient.
==In the wild==
In the wild, seed dormancy is usually overcome by the seed spending time in the ground through a winter period and having its hard seed coat softened up by frost and weathering action. By doing so the seed is undergoing a natural form of "stratification" or pretreatment. This cold moist period triggers the seed's embryo, its growth and subsequent expansion eventually break through the softened seed coat in its search for sun and nutrients.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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