I planted 5 gallon (24-30”) Lyland Cyprus trees, watered them weekly and used evergreen fertilizer twice a year and those puppies were huge after 36 months. As others said 6’ planting distance works well. Keep the base covered in mulch. Worst thing was spraying for bag worms annual every summer. Home Depot rents out 1 or 2 person augers that work well. I went with the two person as the bore diameter is bigger making it easier for the roots to grow faster.