Tulip Fields, Keukenhof, The Netherlands

• Div. 1: Single early - with cup-shaped single flowers, no larger than 8 cm across (3 inches). They bloom early to mid season. Growing 15 to 45 cm tall.
• Div. 2: Double early - with fully double flowers, bowl shaped to 8 cm across. Plants typically grow from 30–40 cm tall.
• Div. 3: Triumph - single, cup shaped flowers up to 6 cm wide. Plants grow 35–60 cm tall and bloom mid to late season.
• Div. 4: Darwin hybrid - single flowers are ovoid in shape and up to 8 cm wide. Plants grow 50–70 cm tall and bloom mid to late season. This group should not be confused with older Darwin tulips, which belong in the Single Late Group.