Good morning, Anne, You must be on the flip side of Southern California for some plants. Our portulacas die out as days shorten. So far, many of ours re-seede from last year, not the frilly, deliciously fussy hybrids, but still beautiful blossoms. I have found that the chief determinant in what will grow and when is the length of the days. With temperatures during our rainy season (late November-March) not appreciably cooler than at many other times of the year, many plants simply will not bloom for us at that time of year. Calendulas, Iceland poppies, callas, pointsettias and rosemary being notable exceptions. I have found the seeds very easy to grow: I just rake the earth a bit and scatter the seeds, and voila!, a gazillion plants. Have a great day! Ron