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There is a bewildering diversity of lettuce types, with more appearing all the time. Butterheads are soft loose-hearted varieties, crispheads or icebergs are large dense and crunchy, cos types have upright crisp leaves, and loose-leaf do not make hearts but are gathered as dense leafy heads or individual leaves are picked over a long period. 'Bijou' has beautiful, dark reddish-purple leaves and is usually grown as a cut-and-come-again crop.