Plan on four to seven months outdoors in most of the United States, and buy for that number rather than for the harvest date printed on a seed packet. The practical move at checkout is to match a cultivar's flowering time to your local frost-free window: find your average first fall frost date, count backward with a two to three week buffer, and only then decide between a full-season photoperiod, an early-finishing photoperiod, or an autoflower. If your window runs under about 120 days, buy autoflowering seed. If you have 150 days or more, a photoperiod seed or clone earns its place with a larger plant and more control over when flowering starts.
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What to look for before you buy
- Flowering time stated on its own. A pack that says "8 weeks" almost always means eight weeks of flower, not eight weeks from seed. You need both numbers plus a separate note on when the plant was started.
- A finish date, not just a week count. Sellers who grow in your region can tell you when a cultivar finishes near you. That beats a generic week count from a different latitude.
- Mold and bud rot resistance. In humid or coastal climates, a slightly earlier plant with tighter resistance beats a late, dense plant that needs perfect weather to finish.
- Seed versus clone. A rooted clone skips three to five weeks of seedling time and is genetically identical to the mother. Seed gives you a taproot, a longer window to transplant, and no pest baggage from a shared mother room.
- Feminized or regular. Regular seed costs you half the plants to males, which matters when your season is short.
Parameter bands to compare
- Full-season photoperiod total: 150 to 210 days from germination to harvest.
- Photoperiod flowering block: 7 to 11 weeks, plus 2 to 4 weeks of pre-flower stretch after the light shift.
- Early-finishing photoperiod: harvest ready 2 to 4 weeks before standard strains in the same climate.
- Autoflower total: 70 to 100 days from seed, with little to gain from starting early indoors.
- Start timing: order seed four to eight weeks before last frost, start indoors two to four weeks before last frost, transplant after soil holds warmth.
- Container size: 15 to 30 gallons for a full-season photoperiod, 3 to 7 gallons for an autoflower.
Common buying mistakes
- Reading the flowering block as the whole grow and starting seed in June for an October-finishing plant.
- Buying a long-flowering tropical line for a climate with a 130-day season.
- Assuming an autoflower will match a photoperiod on yield. It will not, and that is the trade you are making for speed.
- Planting next to a porch light. A single bulb can hold a photoperiod plant in vegetation and push harvest past the frost.
- Skipping hardening off. A plant moved straight from a windowsill to full sun stalls for a week or more.
FAQ
How long from seed outdoors?
Autoflowers finish in roughly 70 to 100 days from germination. Photoperiod plants take 150 to 210 days in most of the country, since they wait for shortening days to flower.
How much time does a clone save?
Three to five weeks of seedling growth, and it removes the uncertainty of when your plant will show sex. A clone still flowers on the same photoperiod schedule.
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Can I start in June and still harvest?
Yes, with an autoflower or a fast-finishing photoperiod. In most of the US, photoperiod plants finish between late September and mid October, so a June start leaves little room before frost.
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Does latitude change the timeline?
Yes. Northern gardens see flowering trigger earlier and frost arrive sooner, which shortens the usable season compared with southern gardens of the same strain.