Green salad bowl lettuce is one of the most popular varieties that we sell. It is a looseleaf type with curly, green leaves that are tender and delicious. can direct sow lettuce seeds in April and early May- it likes to grow when the weather is cool. In the heat of the summer, it bolts to seed. You can then plant it again in late summer for a fall crop. I ALWAYS plants lettuce seed AND plants (started ahead of time) at the same time to double the harvest in a small space. Lettuce plant lettuce! Lots of it, all different kinds!!!