i also live in socal and have asked the same question. while it is possible to grow ALMOST year round in cali, the best time to do it is NOW!. Late febuary to late april is the best time to get started while its still cool. dont plan on having many plants grow once mid july comes around. when the temperature gets to be 95 and up (which it defenately will) the plants get "heat stress" and wilt. i know from experience because ive had about 7 plants since last summer and the heat killed 5. the last two seeds i saved until the beggining of this month and they are already alot taller and healthier than my other ones who were almost twice as old. in case u dont know the ideal temperature for cannabis is 70-80(85) degrees. after 90 degrees they stop growing. when the temp gets even hotter than that, the constant heat of a cali summer shows no mercy on all your hard work =[