As you can imagine, different plants require different harvesting techniques, and in some cases, harvesting incorrectly can result in your plant dying and being unable to produce any further harvests. There are three main plant types that require separate harvesting techniques:
1. Leafy greens. Herbs and salad greens are amazing plants because you can continuously harvest them and they will replenish and continue to grow. For the most part, you can harvest salad greens and herbs (except basil) by using scissors to trim the oldest, largest and outermost leaves and stems from the central cluster.
2. Fruiting Plants. As the name implies, fruiting plants create "fruit", which in gardening terminology means tomatoes, zucchini, pumpkins, corn, peppers, etc... In many cases harvesting the fruit will signal the plant to create more fruit, so quicker you pick your ripe cherry tomatoes, the more tomatoes your plant will produce! For larger plants like pumpkins and corn, the plant will likely only produce 1-2 pumpkins and 2-3 ears of corns per plant.
3. Root Vegetables. Rooting plants include varieties that grow large edible roots, like carrots, radishes, fennel, scallions, and beets. Since root vegetables are harvested by pulling upwards and extracting the entire plant from the ground, there is no way to promote continuous growth. However root vegetables are some of the fastest growing plant varieties out there, so most people could grow 3-4 root veggie rotations each year!