How to grow cannabis indoors

1. Set up the space

Start small and controllable. A tent (or a sealed closet) lets you hold temperature, humidity, and light steady — the whole game indoors is control. You need: a light, an exhaust fan with a carbon filter, a small clip fan for airflow, pots, and a medium.

• A 2×2 or 2×4 tent is plenty for 1–4 plants
• Exhaust fan + carbon filter for heat and smell
• An oscillating fan so air never sits still
• A cheap hygrometer to read temp + humidity

2. Pick a light

Modern LED is the simplest choice — efficient and cool-running. Match wattage to your space and run it at a sensible distance; too close causes light burn, too far wastes growth. Aim for stage-appropriate intensity (lower for seedlings, higher in flower).

3. Choose a medium

Soil is the most forgiving for a first grow — it buffers mistakes. Coco coir grows faster but needs more frequent feeding and cal-mag. Hydro is highest-output but least forgiving. Whatever you pick, the medium decides your watering and feeding rhythm.

4. Know the stages

Cannabis moves through seedling, vegetative, and flowering. Photoperiod plants flip to flower when you cut the light to 12 hours on / 12 off; autoflowers flower on age regardless of light. Each stage wants different light intensity, feeding, and environment.

5. Dial in the environment

This is where harvests are won or lost. Keep temperature in a comfortable band, manage humidity down as you move into flower, and watch VPD (the temp-and-humidity combo that drives transpiration). Feed to the stage and keep your root-zone pH in range so nutrients are actually available.

6. Watch, don't fuss

Most beginner losses come from doing too much — overwatering and overfeeding top the list. Water on dry-back, start nutrients weak and ramp up, and check your plants daily for the early signs of trouble. Catching a problem in week one beats fixing a crisis in week five.

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