这个是他官方的说法：
Planting
On arrival, plant as soon as possible. If they are unpacked but not planted
ensure that they are soaked and wrapped back up securely. Never allow the
roots to dry out at any time prior to and during planting. Before planting
soak the whole plant in water overnight. When planted, the base of the canes
(bud union) should be about 4 inches below ground level in cold winter
areas and at ground level in mild winter areas. Water in well and mound the
base of the canes with about 6 inches of compost, soil or bark chippings
until the plants leaf out. We recommend the use of Start at planting time.
我觉得只要保持根部湿润，一个星期是没问题的。保险的做法是把箱子打开，找个水桶
把根部泡在水里, 枝子露出水面，两三天换次水
