Buy Marijuana Seeds in California for a Long Season

Prop 64 lets adults 21+ grow up to six living plants, and the cap applies per private residence, not per adult. A household of three still shares six plants. Health and Safety Code 11362.2 requires plants and any harvest over 28.5 grams to be kept in a locked space that can’t be seen by normal unaided vision from a public place.

Local control is the catch. Cities and counties may ban or permit outdoor home grows, but they can’t stop you from growing indoors in your home or in a fully enclosed, secure accessory structure. The Department of Cannabis Control notes that some cities also require permits.

Buying seeds online for a personal garden is routine, and licensed stores sell them too. Selling or trading what you grow without a state license is still illegal, though adults may give up to 28.5 grams to another adult 21+ for free.

California runs from USDA zone 5a in the high Sierra to 11a on the southern coast, and Los Angeles sits in 10b. Frost almost never reaches the LA basin, San Francisco or San Diego. Sacramento’s median last frost is February 2 and its first is December 2, about 301 frost-free days.

So frost rarely sets your calendar here. Day length does, because photoperiod plants start flowering as nights lengthen in late summer. Heat is the other limit. Fresno and Redding average July highs near 98°F to 100°F, while San Francisco stays around 66°F under summer fog.

Bud rot risk is low in the dry interior but moderate along the fog belt and the North Coast, where Eureka’s rain jumps in October. Late-summer wildfire smoke can dim sunlight for days. At Lake Tahoe the season shrinks to about 108 days. Conditions can change within a 20-minute drive, so plan around your own microclimate.

A long, sunny season rewards photoperiod plants. Inland growers in the Central Valley, the Sierra foothills and Southern California can run big feminized photoperiods or even a sativa-dominant plant that flowers into late October, since frost is not the deadline.

Coastal growers face a different problem. Cool, foggy nights favor compact, mold-resistant plants that finish by early October, so look at fast flowering seeds or sturdy hybrids with open bud structure. Haze-type sativas tend to struggle in thick coastal fog and cool nights.

Because six plants is a household limit, every slot counts. High-yield genetics make sense for a single outdoor run, and autoflowers can squeeze in a quick spring or fall crop where local rules allow outdoor growing. If THC isn’t the goal, CBD seeds grow the same way. Whatever you pick, compare its listed flowering weeks with your area’s first October rain.

If your city bans outdoor cultivation, a tent inside your home or a locked accessory structure is the legal route. Indoor growing also dodges smoke, budworms and fog, though summer power bills climb fast in valley heat. Renters should also check the lease, because property owners can prohibit cultivation on their premises.

Where outdoor growing is allowed, few states match California’s free sunlight. A locked, screened yard grow can easily outproduce a small indoor tent several times over in a single season. Read our guide on when to plant marijuana outdoors before you transplant.