GSC Strain Yield and Flowering Time Guide

GSC Yield and Flowering Time: Short Answer

Girl Scout Cookies finishes flowering in 9 to 10 weeks indoors and yields about 1.5 to 2.5 ounces (45 to 70 grams) per plant in a home tent. Commercial rooms push 400 to 500 grams per square meter. Outdoor plants finish from late September to mid-October and can reach 500 grams or more per plant after a full season of sun. GSC is a quality-first strain. Resin, color, and flavor carry its reputation, and its yield sits in the middle of the pack.

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Prerequisites

• A photoperiod or autoflower seed of verified GSC lineage
• A tent or room that holds 75 to 80 F in the day and drops 5 to 10 degrees at night
• A carbon filter, since GSC throws strong odor from week 4 of flower
• A loupe or USB microscope for trichome checks

What Yield Numbers Mean for This Strain

Breeder figures describe ideal rooms with high light levels, steady CO2, and a trained canopy. Home growers working under a 4x4 tent with a 400-watt LED should plan on 3 to 5 ounces per plant rather than the ceiling number. GSC forms dense, tight buds that weigh more than their size suggests. That density helps final weight and hurts airflow. Count on a moderate harvest and grade it by bag appeal instead of bulk.

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Flowering Time by Grow Type

• Indoor photoperiod: 63 to 70 days from the flip to 12/12
• Outdoor full season: harvest late September to mid-October, with latitude deciding the date
• Autoflower version: 70 to 80 days from seed to chop

Two GSC phenotypes show up in most seed packs. The OG-leaning plant finishes near day 63 with darker leaves. The Durban-leaning plant runs 70 days and stretches more in the first three weeks of flower. Track each plant on its own calendar.

gsc strain yield and flowering time

How to Raise GSC Yield

1. Top once above the fifth node and let two main leaders form.
2. Train with low-stress methods or a net so every cola sits at the same height.
3. Run a balanced veg feed, then shift to a bloom mix with extra phosphorus and potassium at week 3 of flower.
4. Drop night temps 5 to 10 degrees below day temps to hold terpenes and color.
5. Defoliate the lower third at day 21 and again at day 42 of flower.
6. Hold humidity at 45 to 55 percent from week 5 through week 8 to protect dense colas from rot.
7. Harvest when trichomes read cloudy with a few amber heads scattered through the canopy.

Common Mistakes That Cut the Harvest

Overfeeding nitrogen in flower pushes leaf growth and delays bud swell. Cutting at day 56 because the breeder listed 8 weeks leaves weight on the table, since GSC packs on most of its mass in the final 10 days. Letting humidity climb above 60 percent late in flower invites mold inside tight buds. A slow dry at 60 F and 60 percent humidity for 10 to 14 days protects the weight you grew.