Plant in good garden soil to which a generous amount of humus, such as coarse peat, has been added. It is important to avoid deep planting, which may damage or kill the plant. Pack down the soil mix well and, for larger plants which may settle, the root system should be planted a little higher than the original level. Providing good mulch the year around is very important. It helps the soil retain moisture, keeps the summer weeds out, and in winter helps prevent deep freezing of the soil and plant dehydration.
Many materials are suitable.
Cover to a depth of 2 to 4 inches. Established plants require less watering except in times of prolonged droughts. Sprinkling of the foliage, however, on hot summer evenings is beneficial to plant and flower bud development. Also be certain the plants do not dry out during or cold and dry winters. Spray water on the plants only when the temperature is above freezing.