Short answer
Purple Punch, the indica-dominant cross of Granddaddy Purple and Larry OG, usually finishes flowering in 8 to 9 weeks after the light flip indoors. Fast phenos can be done near day 49, and heavier, slower expressions run to day 63 or a bit past it. Yield sits in the moderate to heavy range: commonly cited numbers run about 400 to 600 grams per square meter indoors and 500 to 700 grams per plant outdoors when plants get a long vegetative period, full sun, and room to spread. The top pick for most home growers is a documented 8-week pheno grown in a scrog under strong light, because that combination gives you the shortest turnaround with the densest flower. The criteria used here are the breeder stated window, the stability of the purple expression, node spacing, and bud density, since those four decide whether a plant hits the numbers on the label.
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Flowering time in detail
Indoors
Count from the day you switch to 12/12, not from the day pistils first appear. Most Purple Punch plants show flower sites within 7 to 10 days and then stack through weeks 3 to 6. The stretch is modest, often 30 to 50 percent of the pre-flip height, which keeps it manageable in tents with limited headroom. Weeks 6 to 8 are when the calyxes swell and the stems start to bend under the weight.
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Outdoors
Outdoor plants follow the photoperiod. In most of the United States, flowering begins somewhere between late July and mid September depending on latitude, and harvest lands from late September into mid October. Outdoor runs usually take one to two weeks longer than the same cut indoors because of cooler nights, shorter effective light, and wider temperature swings.
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Yield expectations
Indoor yield
- Pros: Controlled light and temperature, repeatable results, easy to run a scrog that fills the canopy evenly, lower risk of mold if humidity is managed.
- Cons: Yield depends on light intensity and veg time, so short veg cycles quietly cap your harvest, and dense buds demand good airflow.
Outdoor yield
- Pros: Free light, large plants, single plants can outproduce a small indoor room, strong purple coloring in cool October nights.
- Cons: Weather risk during the final weeks, rain and humidity near harvest encourage bud rot, and results swing hard from season to season.
Criteria that change the numbers
- Light intensity: Flower density tracks available light during weeks 4 to 7. Weak light gives airy flower regardless of the strain label.
- Vegetative time: Two weeks of veg gives a small plant, five to six weeks gives a canopy worth scrogging.
- Container size: Root volume sets the ceiling on plant size, and small pots finish early with smaller colas.
- Training: Topping, low stress training, and a screen spread the same number of sites across more area and raise grams per square meter.
- Environment: Night temperatures in the low 60s Fahrenheit during late flower bring out the purple, but cold stress can slow ripening.
Use-case recommendation
If you want a predictable, fast turnaround in a tent, run an 8-week Purple Punch cut in a scrog with two to four weeks of veg and harvest on trichome color rather than the calendar. If you have a long season and want volume from a few plants, grow it outdoors with a mid season topping and plan to harvest before the first serious rain. If you are buying seed and yield matters more than speed, ask for the heavier, later finishing pheno and give it the full nine weeks.
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Judging ripeness
Purple Punch can look finished before it is. Purple calyxes and orange pistils show up while trichomes are still clear. Check trichomes on the calyxes, not the sugar leaves, and cut when most are cloudy with a few amber. Clear heads give a thin, edgy effect, and letting it run too long costs terpenes. After harvest, dry slowly at around 60 degrees Fahrenheit and 60 percent humidity for 10 to 14 days, then cure in jars for at least two weeks to preserve the grape and berry aroma the strain is known for.