I grow various genera of South African Bulbs in Brookings Oregon under glass, but in frames, as opposed to a greenhouse, mainly for protection from excessive rain (+100 inches in winter). Although it is cloudy here a lot in winter there may be stronger light when the sun does shine. The plants do flower well with no additional lighting. One thing I have noticed in other greenhouses in the PNW where SA bulbs are grown is that the plants need to be grown as cool as possible. If there is a string of sunny days in the winter and the temps go above a certain threshold the bulbs tend to want to go dormant too early. Ventilate your bulbs as much as possible and heat minimally. The bulbs here have taken temps into the upper 20'sF with no affect on performance. Paul Otto Brookings OR ________________________________ Hi Robin, I am a beginner with SA bulbs. None of the ones I have have begun to flower yet. I have had the greenhouse less than a year. I am just presupposing that the light levels in western Washington might be too low to get these bulbs to grow and flower successfully. I really appreciate hearing about others experience! thanks, Sarah