Not entirely. It is true, however, that, as a general rule, the bigger the tulip bulb the bigger the flower. But bigger does not necessarily mean better. The flower bulbs of a species tulip such as Tulipa tarda, for example, would appear quite tiny beside, say, a large Darwin hybrid flower bulb such as ‘Apeldoorn’, but these small species tulips are some of the most delicate and lovely bulb flowers you can grow. They’re quite hardy as well. Tulip bulbs are sold by their bulb size measured in centimeters around the circumference. Within any particular type or variety of tulip, the larger bulbs will demand a higher price than the smaller ones. For big showy displays, bulbs with the larger bulb sizes are certainly worth the price. However, you can get some excellent bargains by buying lots of smaller bulbs for brightening up a marginal spot in the spring yard.