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They self-sow with a vengeance here during the fall and spring when temps are in the 60's/mid 50's, so I think you may be keeping the seeds too warm. -Out of curiosity, I checked B&T World Seeds and The Backyard Gardener, and they both recommend that you keep the seeds between 50 and 60 degrees, so I really think you might have better luck starting them outdoors/winter sowing them once your daytime temps are in the 60's, nights in the 50's.