Cyanella are winter growing for the most part, including C hyancinthoides. So it would germinate best under cool conditions like other Cape bulbs. You do need to keep aphids away as they spread virus, also they need cool and bright (sunny) conditions to grow well. Warmth only encourages dormancy, which often happens anyway soon after flowering and seed production in spring. Ernie DeMarie Westchester Co NY Zone 7 but not this year