Depending on the variety, day-light hours, squat short-season varieties can be planted 4-5ft apart in the rows, which can typically equate to 1200-2000 plants per acre. For longer season varieties 600-1200 plants per acre is adequate. Depending on your agriculture region you may need to plant in the direction of the dominant airflow. Hemp likes consistent air movement, and having space between rows allows for more airflow and for space when practicing cultural crop management techniques. Knowing the growth and maturity habits of varieties helps determine crop planting dates.