What is this? I planted a type of lettuce a while ago, don't remember what kind. This lil guy is spicy as hell, too spicy for a salad. Looks a little like kale? Why so spicy? : r/gardening
22 Different Types of Lettuce (With Pictures)
Arugula/Rocket – Botanical Interests
13 of the Best Varieties of Mustard Greens | Gardener's Path