- You Will Get 100 Seeds Of Mary Washington Asparagus Officinalis Perennial Vegetable Seeds. - Description: - Name: Mary Washington Asparagus. - Scientific Name: Asparagus Officinalis. - Color: Green With Yellow Flowers. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 36 - 48”. - Plant Spacing: 9 - 12”. - Hardiness Zone: 4 - 9 *Yes, These Vegetables Are Perennial!. - Harvest: 60 Days. - Light Requirements: Sun. - Soil & Water Preferences: Average.