Re: Iceberg lettuce:
I am sure that iceberg lettuce will grow very well in hydroponic gardens. I have seen beautiful head cabbage in rockwool drip and NFT systems. They both have about the same
nutrient requirements. I am going to try a couple of iceberg plants and see what happens. I think the main reason that commercial growers grow varieties of leaf lettuce and not head-type is that leaf lettuce develops faster and they can harvest more crops per year. Anyhow, I'll give iceberg a go and post pictures of the development - or non-development - which ever way it works out!
Ron K.