During Winter and some early Spring shipments. Some of the plant materials in this shipment are DORMANT. Which means that even thought they have no green top growth, they will grow from dormant buds when temperatures are right. For many perennials, This 'rest period' is ESSENTIAL to good flowering performance in the upcoming season. During Summer/Winter months shipping might be delayed as we only will be shipping on days that we know it wonít harm the plant(s). Monday through Wednesday.