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Indoor Marijuana Seeds

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Quick answerThe best indoor marijuana seeds are strains that finish under about 4 ft (1.2 m), stretch less than double after the switch to 12/12, and flower in 7 to 10 weeks. Feminized photoperiods give the most control and yield per square foot, while autoflowers suit small tents and quick harvests.

What makes a strain good for indoor growing?

Indoors, your limits are headroom, light and smell. Strains that fit those limits make the whole grow simpler.

Height and stretch. Plants keep growing for 2 to 3 weeks after you flip to 12/12, often adding 50 to 100 percent to their height. A 6 ft (1.8 m) tent loses about 2 ft (60 cm) to the pot and the light, so most strains need to finish under 4 ft.

Odor. Flowering cannabis smells strong. Run a carbon filter on your exhaust fan no matter what you grow, and treat low-odor strains as a bonus, not a fix.

An even canopy. Strains with many similar branches fill a SCROG net or respond well to LST, which raises yield per square foot.

Plants and light per tent size

Tent sizeFloor areaPhotoperiodsAutoflowersQuality LED (actual draw)
2x2 ft (60 x 60 cm)4 sq ft (0.37 m²)11-2100-150 W
2x4 ft (60 x 120 cm)8 sq ft (0.74 m²)1-22-4200-300 W
3x3 ft (90 x 90 cm)9 sq ft (0.84 m²)1-42-4200-300 W
4x4 ft (120 x 120 cm)16 sq ft (1.5 m²)1-64-9400-500 W
5x5 ft (150 x 150 cm)25 sq ft (2.3 m²)2-96-12600-750 W

Indoor environment targets

  • Light: about 300-600 µmol/m²/s of PPFD in veg and 700-1,000 in flower, on 18/6 for veg and 12/12 for bloom.
  • Temperature: 75-82°F (24-28°C) with lights on and 65-72°F (18-22°C) with lights off.
  • Humidity: 55-70% for seedlings and early veg, 45-55% in early flower and 40-50% for the last 3 weeks. A VPD chart fine-tunes these numbers.
  • Airflow: an exhaust fan that replaces the tent's air every 1 to 3 minutes, plus clip fans above and below the canopy.

Set up your indoor grow

How to Grow Marijuana IndoorsA full setup walkthrough.Autoflower SeedsSmall, fast plants for tight spaces.High Yield SeedsStrains that fill a canopy.Grow TentSizes, features and what to look for.

Indoor seeds FAQ

How many plants can I grow in a 4x4 tent?

Most growers run 1 to 6 photoperiod plants or 4 to 9 autoflowers in a 4x4 ft (1.2 x 1.2 m) tent. Fewer plants need longer veg and more training to fill the space, while more plants finish faster with less training. Check your state's plant count limit before you plan.

What size light do I need for indoor growing?

A quality LED drawing about 25 to 35 watts per square foot covers most needs. That works out to roughly 400 to 500 watts of actual draw for a 4x4 tent. Ignore inflated equivalent wattage on cheap lights and compare actual draw and measured PPFD instead.

Are autoflowers or photoperiods better indoors?

Photoperiods usually yield more per square foot because you can veg and train them to fill the space. Autoflowers are faster and simpler, need no light schedule change, and suit small tents or growers who want a harvest every 10 to 12 weeks. Many indoor growers keep both.

How do I control smell when growing indoors?

Use an inline exhaust fan with a carbon filter sized to your tent, and keep the tent under slight negative pressure so air only leaves through the filter. Replace the carbon on the maker's schedule, often every 12 to 18 months, and keep the tent closed as much as possible in late flower.

What is the ideal temperature for indoor marijuana?

Keep lights-on temperatures around 75 to 82°F (24-28°C) and lights-off temperatures about 5 to 10°F (3-6°C) lower. In late flower, slightly cooler days near 72 to 78°F (22-26°C) help preserve aroma. Avoid sustained canopy temperatures above 85°F (29°C).

Build your indoor setup the right way

Our indoor growing guide covers tents, lights, ventilation and a simple weekly routine.

Read the indoor guide
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