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Water pines regularly after planting to help establish strong roots. Pines require about 1 inch of water each week from either rain or home irrigation. Continue regular maintenance watering for the first two years of the plant's life.
1 Allow for approximately 35 feet (10.67 m) spacing between each pecan tree that you plant. 2  If trees are crowded, the faster growing tree will over-shadow a slower, stunt it and kill the shaded one eventually, hampering both trees' crops.ater it well. Water your pecan tree thoroughly immediately after planting it. For the first 6 months, water about 10 to 15 gallons (37.9 to 56.8 L) once a week. Do not water too much or too often, though, since you don't want keep them in a harmful soggy condition.