Randall, It may be that our respective climates make the difference. Even though you have a greenhouse, perhaps your lower nighttime temperatures even inside the house (provided it is not heated) drop to lower levels during the night than they do here. I know people in the San Gabriel Valley in Los Angeles where Romuleas sprout readily. Light frosts are not uncommon there in the late fall. That may not happen in Monterey, it being close to the ocean, but nights in fall are cooler than here. Possibly, the minimum temperature plays a bigger role than the day to night variation, which many people and books tell us is the controlling factor for many of these winter-growing South African seeds. Andrew San Diego