- You Will Get 3000 Seeds Of Loose Leaf Green Grand Rapids Lettuce Lactuca Sativa Vegetable Seeds. - Description: - Name: Loose Leaf Green Grand Rapids Lettuce. - Scientific Name: Lactuca Sativa. - Color: Green With Yellow Flowers. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 6 - 12". - Plant Spacing: 3 - 6". - Harvest: 45 Days. - Light Requirements: Sun. - Soil & Water Preferences: Average.