Eastern White Pine Trees are drought tolerant, however, they grow slowly without adequate water. Properly watering the tree after planting is extremely important. To do so, backfill and lightly compact the 50/50 mix of existing soil and compost and then give the tree a good deep watering. Do not rush watering them as most of the water you put on the plant at first will run away from the plant until the soil is saturated. A general rule of thumb is to count to five for every one gallon of pot size. For example, a one-gallon pot would be watered until you count to five, a three-gallon pot would be 15, and so on. Check the plant daily for the first week or so and then every other day thereafter.