None of those should actually be fed as a regular staple in my opinion. Spinach is considered questionable on whether you should feed at all and lettuces of any kind have very little nutritional value.
claudiusx posted an excellent site that's very easy to read and understand. Alfalfa (plant, not sprouts), Collard Greens, Dandelion Greens, Endive, Escarole, Mustard Greens and Turnip Greens are those listed on the site as great staples. I myself go with Collard Greens, butternut squash and Mustard Greens for my salad simply because I cannot find the others consistently in our supermarket.
claudiusx posted an excellent site that's very easy to read and understand. Alfalfa (plant, not sprouts), Collard Greens, Dandelion Greens, Endive, Escarole, Mustard Greens and Turnip Greens are those listed on the site as great staples.
I picked Endive, Mustard Greens and Collard Greens because Ive seen these three in stores.
BUT yesterday, I had my grandmother grab me some. (of the three listed)
and they told her (from what I understand) Mustard and Collards arnt year round, they are only around for a short time. Thus these options are pretty much useless to me. x.x
Endive they told her are year round, but I got 'Curly' endive, so I hope thats okay, they seemed to like it.
but they didnt have any Endive out we had to ask and have them get it from the back. x.x
I also plank my acorn squash - I invested in a "Mandoline" - it's a kitchen tool that does very even slices - they can get pricey - up into the $50 range - I found one made by Oxo for only 15 and it was well worth it!