Heirloom BLACK BEAUTY ZUCCHINI SUMMER SQUASH Seeds. This popular, and very productive home garden and shipping squash variety matures 50-62 days. Black beauty grows on semi-upright plants. Glossy black-green fruits average 6-8 inches long x 2 inches diameter and are best when harvested young. Tender flesh is firm creamy-white and has a fine flavor. You can almost grow these all year round. Just count back 50 to 60 days from when you think you will have your first frost. Here in Georgia we can plant these seeds as late as September sine we do not usually get our first frost until November or December so you can get many plantings and many harvests.