Lettuce

Butterhead or Bibb lettuce is a loose-heading type with dark green leaves that are somewhat thicker than those of iceberg lettuce. Butterheads develop a light yellow, buttery appearance and are very attractive in salads. A miniature variety of butterhead, Tom Thumb, is very easy to grow and requires a short growing time. Bibb lettuce will develop bitterness readily if temperatures go above 95 °F. Romaine or cos is less commonly grown by gardeners but is a very nutritious lettuce that deserves attention. It too is relatively easy to grow, forming upright heads with rather wavy, attractive leaves.