E H Krelage of Haarlem in the Netherland is known to have grown the first Darwin Hybrids. In 1889, Krelage used the new hybrids in the first mass displays of Tulips for the opening of the Effel Tower. Naming permission was obtained from Charles Darwins' son. Their single flowers are ovoid in shape and up to 8 cm wide. Plants grow 50-70cm tall and bloom mid to late season.