Organic Zucchini Summer Squash seeds garden seeds vegetable seeds bulk 25 Organic Black Beauty Zucchini Summer Squash Seeds. Non GMO and Heirloom. 3 grams of seeds. 60 Days. One of the most productive crops to ever find its way into the home garden, Black Beauty zucchini summer squash seeds will produce vigorously well up until the frost. Harvest Black Beauty zucchini often as fruits are most tender and delicious when about 6-8", but seeds quickly grow 18-24" long if left in the garden even for a few extra days. Summer squash thrives from frequent harvests and, if left unattended for even a day or two, will surprise with huge fruit. Summer squash seeds are a full sun staple able to be sown directly after final spring frost but, for earliest starts, begin indoors 3-4 weeks prior. Plant 2-3 squash seeds 1" deep per cell, 4-6" apart in Organic, moist, well-drained soil with a pH of 6.5-7.0.