Photos and description courtesy of Adam Saunders, of the Columbia Center for Urban Agriculture. A massive heat wave has settled in over much of the country. This creates challenges for all people, but especially gardeners. Tomatoes are a staple crop for gardeners but the hot weather can cause the flowers to fall off before they get pollinated and lead to a failed crop. Check out these pictures that show a-frame shade structures over tomatoes. They are built out of lumber, have a 7 ft wide white cotton row cover, and are anchored with rot-resistant wood stakes. Notice how the covered plants have healthier flowers, better vertical growth and more fruit on the vine (hard to see in photo).