I always prefer any of the various romaine types but you might want to ask over on the Hydroponics forum for recommendation on what varieties work best for them when hydroponically grown.

I don't know but I suspect that with hydroponics you'd want to go with stronger flavored leafy greens like arugula, escarole, mesculun, chicory, etc.

Dave

au contraire. I picked a big chicory salad three nights ago, just before the weekly watering, and it was quite bitter. Last night I watered well again a day before, it was much sweeter. Them bitter greens get mild when their feet are in water all the time. My favorite lettuce is light green oakleaf lettuce. Since various types are designated as oakleaf, I am adding a link below to the specific type (I also grow the one at

http://commons.wikimedia.org/wiki/File:Green_Oak_Leaf_lettuce_J1.jpg

much more tender, and also well liked in my family)

I like it for productivity, holding up in the heat and generally long cropping, and crunch.

Here is a link that might be useful: oakleaf lettuce images