plant bolt-resistant or heat-tolerant types of lettuce, such as butterhead varieties or romaine cultivars like ‘Sparx’ and ‘Salvius.’ Related: 4 Best Types of Lettuce to Grow in Your Garden 2.

It is quick growing and slow to bolt. Red sails is an All-America ... young leaves as mature leaves can become bitter. Butterhead or bibb lettuce A loose-headed green variety, butterhead lettuce ...