Plant Bed SeedsStarted PlantedOutdoors First Harvest Last Harvest Fertilizer Harvest Asparagus 1 N/A Perenial 1 to 1.5 10-10-10, per 100 square feet in early spring before the spears emerge. After the last harvest in June using a nitrogen fertilizer, apply .10 pound of actual nitrogen per 100 square feet.  Mint […]