What vegetables can grow in 30 days?
Radishes: these are one of the fastest-growing vegetables, typically ready to harvest in about 3-4 weeks. Lettuce: leaf varieties of lettuce can be harvested in as little as 30 days, while head types may take a bit longer. Although leafy greens can produce eatable leaves within a month or so, the real winner when it comes to fast-growing vegetables is the radish. With the right conditions, you can harvest radishes in less than a month and sometimes in as few as three weeks.