How many plants can I grow?
Greenhouse tomatoes need between 4 and 5 square feet per plant. To determine how many plants you can grow, multiply the greenhouse width times the length and divide by either 4 or 5. Be sure to deduct any floor area used for packing, grading, sales, or equipment before dividing, since this is not usable growing space. Research at the Truck Crops Experiment Station has shown that increasing the spacing to 5 square feet per plant results in the same yield per greenhouse (i.e. higher yield per plant), even though the plant population is reduced by 20%. However, the number of physiological disorders decreases, resulting in better fruit quality.