What can grow in 4 weeks?
One of the quickest vegetables to grow are radishes which can be ready to harvest in as little as 30 days. Another fast crop is anything grown for the edible leaves or stems like leafy greens, arugula, and pea shoots because they can be harvested any time. Radishes. Radishes are both a cruciferous and root vegetable—yet unlike many other vegeatables in these categories, they grow very quickly from seed. Radishes can handle the cold weather of early spring, and take only 30 days from seed to harvest, says Marie-Helene Attwood, founder of Edible Petals.