Casey introduces us to the Three Sisters: squash, corn, and beans. This refers to an ancient companion planting technique that has been used by indigenous people in the Americas for centuries. All three of these crops are native to the Americas and were domesticated thousands of years ago.
Drought tolerant plants have a variety of modifications to their leaves that allow them to survive hot, dry conditions. Daniel describes some of these modifications and then introduces us to other drought surviving strategies involving leaves.