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I often feed my turtles a combination of green leaf, radicchio, and romaine lettuce. The other day I ran out of my mixture but had some Boston lettuce that I was going to make a salad with for myself. I gave the turtles a little and they loved it. It is ok to include Boston lettuce and a more regular part of their diet. They really loved it.

Also, I noticed that green leaf is not on the list of lettuces to feed. They also love that and it has been an almost daily part of their diet for awhile. Is that OK?

well a quick google search because I don't know what boston lettuce looks like and found the following

Nutritional values per 100 g
Calories: 13; Water: 95.58 g; Carbohydrates: 2.32 g; Fat: 0.22 g; Protein: 1.29 g; Fiber: 1 g.
Rich in calcium, magnesium, potassium, sodium, vitamins A, B, C and K.

It looks like a type of Romain lettuce which should be fine. People just dont recommend ice berg because its mostly water with not much else.

just keep a look out for their poo.

Green leaf is on the list from the main site: http://www.redearslider.com/plants.html

Boston lettuce has been talked about on this forum before. As said, very rich in calcium.

Butterhead lettuce is a huge favorite of two of my turtles, I guess because it's a bit sweeter than romaine lettuce. Those two tend to like sweet things anyways, like blueberries and strawberries... lol. Sweet-beaked turtles.