This is a
dilemma for many gardeners who must work their gardening around their
other responsibilities. Try to avoid the hottest part of the day; instead
transplant in late afternoon or evening. You can set up small windbreaks
around the transplants by poking evergreen branches, pieces of wood
such as shingles, or anything else that will break the wind. You can
also set up some hoops, and cover the new bed with shade cloth, available
from greenhouse suppliers. Some gardeners even create miniature "lath
houses" -- small structures made from wooden frames and evenly
spaced lath as a roof. These provide shade for new transplants, and
they can be moved about the garden to help shade summer sowings of cool
weather crops like lettuce.