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Seed to Harvest. Zucchini do not take long to grow once you plant the seeds in the ground. Depending on the variety, you may be able to harvest the plants anywhere from 42 to 52 days after planting. This time includes blooming and pollination of the flowers.
A typical grow takes about 85 days from seed to harvest, but that number can vary quite a bit depending on what strain you're growing and how long you keep the plants growing vegetatively before flowering them. If you want to minimize calendar days of grow time, you can select early-maturing strains for growing.