Every thing; arugula, red oak leaf, mache, romaine,baby lettuces,
endive, escarole, regular spinach and New Zealand,
parsley, cilantro....I like them all, but mustard greens are a bit hard to take. When I get my lettuce greens home, or pick them from my garden, I immediately put them into the large bowl of the salad spinner filled with water and let the leaves (which I've removed from the stalk and washed under the faucet) sit in water, swish a few times until the dirt settles to the bottom. I carefully remove the leaves, and check them for rotten spots or rotten clingy pieces and discard. I put leaves through the salad spinner and put into a zip lock bag(s). Now I have fresh, cleaned lettuce ready to go when I am. This procedure makes it so much easier to toss together a great salad. When bought at the Farmer's Market or picked from your garden, it lasts for 2 weeks or more.