All plants should be soaked to runoff upon arrival, especially in dry conditions. As each plant is planted, the root ball must again be watered to enable the plant to survive.
The 1st 60 days are most critical. Proper watering is essential. As each plant is planted water each day for at least two weeks. The next two weeks, the plants should be thoroughly soaked every other day. And water thoroughly three times a week for the next month. Thereafter, water as necessary depending on the season and rainfall conditions.