Herbs can benefit from the protected environment of a greenhouse and some tender annual herbs will really thrive in a greenhouse, for example when growing basil. Many herbs can happily grow in a greenhouse year-round, but they are also perfectly suited to growing outdoors. It is often more efficient to dedicate valuable indoor space to more tender and heat-loving crops. In addition, the likes of cilantro, dill, and parsley are likely to go to seed if grown in a greenhouse during summer.