在圃内越冬的苗木叫留床苗。留床苗植株细小,抗寒力差,因此在土壤结冻前,对留床苗应浇一次“封冻水”,以增加土壤湿度,进而保温防寒。对矮小怕冻和容易干梢的树种,可将苗畦土埂的土起出或运来砂土,在上冻前把苗木按倒后用土埋严。冻害较轻的地方,可在苗木的行间填土,待春天发芽前, In the nursery winter seedlings called bed nursery. Leave bed seedlings plant small, cold resistance is poor, so in the soil before freezing, the bed should be left to pour seedlings “frozen water” to increase soil moisture, and then insulation cold. On the short afraid of freezing and easy to dry tip of the tree species, soil Miao Miao can be raised or transported from the soil, sand and seedlings in the ground before the top down by the soil buried. Frost harm less places, fill lines in the nursery of the line, until the spring before germination,