Purple Punch flowering time and yield at a glance

Purple Punch finishes in 8 to 9 weeks of 12/12 light indoors, which puts harvest at 56 to 63 days after the flip. Indoor gardens return 450 to 600 grams per square meter under strong light. Outdoor plants in full sun finish in late September to mid October in the northern hemisphere and return 450 to 700 grams per plant. THC lands between 18 and 23 percent, with dense, purple-tinged flowers and a grape and blueberry nose.

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Flowering time by phenotype

Purple Punch is a Larry OG and Granddaddy Purple cross, and each plant leans toward one parent. Read the leaves and bud structure to pick a harvest date.

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  • Larry OG lean: 56 to 63 days, longer internodes, sharper citrus note.
  • Granddaddy Purple lean: 63 to 70 days, tighter flowers, heavier color at the finish.

Add 5 to 7 days to either figure under low light, cool rooms, or a heavy defoliation schedule.

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Yield expectations

  • Coco or hydro, 600 W HPS equivalent LED: 550 to 650 g/m².
  • Soil with a 4 week veg: 450 to 550 g/m².
  • Outdoor, 100 L pot or larger, full sun: 450 to 700 g per plant.
  • Autoflower version: 70 to 80 days from seed, 300 to 450 g/m².

Before you start

  • Verified seed or a clone from a known mother.
  • Light that delivers 600 to 900 PPFD at the canopy in flower.
  • pH and EC meter for your feed.
  • Calibrated hygrometer and a 30x to 60x loupe.
  • Carbon filter, since the grape terpene profile carries far in late flower.

How to reach the yield window

  1. Germinate seed or root clones under 18/6 light.
  2. Veg for 3 to 5 weeks until the canopy fills 70 percent of the footprint.
  3. Top once above node five.
  4. Spread branches flat with low-stress training.
  5. Flip the timer to 12/12.
  6. Hold day temps at 24 to 26 C and night temps at 20 to 22 C.
  7. Keep relative humidity at 45 to 55 percent through weeks 2 to 6.
  8. Feed a bloom ratio near 1-2-3 and hold runoff EC within 0.3 of the input.
  9. Defoliate the lower third at day 21 of flower.
  10. Check trichomes from day 50 with a loupe.
  11. Cut when 70 to 80 percent of trichomes read cloudy with a few amber heads.
  12. Dry 10 to 14 days at 18 to 20 C and 58 to 62 percent humidity.

What caps yield

  • Veg shorter than 3 weeks, which cuts node count before the flip.
  • Night temps above 26 C, which stalls resin and stretches flowers.
  • Humidity spikes above 60 percent in weeks 5 to 7, the main bud rot risk for tight colas.
  • Harvest before day 56, when flowers have size but no weight.
  • Harvest after day 75, when THC starts to degrade.

Harvest cues

Purple Punch shows color on the calyxes, not the sugar leaves. Judge ripeness on trichome color and on pistil recede, and ignore the purple tint, which shows up on healthy plants weeks before the finish.

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