Answer: stratifying

AnswerCrossword Clue
STRATIFYINGForming layers
stratifyingPlace (seeds) close together in layers in moist sand or peat to preserve them or to help them germinate
stratifyingForm or arrange into strata
stratifyingSTRATIFY, to arrange in layers
stratifying(of seeds) Be germinated by this method
stratifyingArrange or classify