Traditional 'ridge' cucumbers and modern smoother skinned types. Suitable for growing outside or in a frame, unheated greenhouse or tunnel. Will grow at lower temperatures and humidity than 'greenhouse' types. Can be left to trail over the ground although those with longer fruits are best grown with support. Remove flowers after sufficient fruits have set to prevent fruits becoming bitter and mis-shapen. Sow under glass in April and plant out in May after the last frost.