Spring/Summer stock only. It grows up and up, and keeps producing sweet, crunchy, non bitter, fingered leaves all summer in the heat. A great plant that gives even when it flowers. Ours have beautiful bluey/purple flowers that are loved by bees.
Picture is from Sethas seeds website where you can also get seeds. Our seeds have been saved by us for 5 plus years now so were not sure what the origin is.
https://www.sethasseeds.co.nz/ourshop/prod_5203272-Lettuce-Tree.html