Developed by Lois Stack, Ornamental Horticulture Specialist, University of Maine Cooperative Extension Crop Average yield Ounces of seed or number of plants per 10 feet of row Distance between rows (inches) Distance between plants in row (inches) Depth of planting (inches) Planting date in central Maine* Asparagus 6 spears/plant 6-7 plants 36-48 18 6-8 4/20