Ready Set Grow. With a garden's worth of greenery, Avery grills up a batch of veggie burgers. Lily heads into the field to unravel a mystery: how do greenhouses help veggies grow in winter (Psst. The secret is right under your feet). Then our duo discovers a funny thing about tomatoes - they're actually fruit. And avocados are actually berries. Turn them into dip and discover a delicious treat.