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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.
Check to ensure the broccoli is ready for harvesting. For an idea of when to pick broccoli, mark down on the calendar the day you started your seeds. At the 55-day mark, start closely watching your plants. Look for the broccoli's head to be anywhere from 4 to 7 inches (10.16 to 17.78 cm} wide. Size is not the only indication that it is time to start harvesting broccoli.