Getting started growing cannabis can feel overwhelming, but the fundamentals are straightforward. Keep in mind, all you really need to do is plant a seed. All the variables, and ins and outs, the this and that, it’s all just to maximize your produce. But starting a plant for the love of the plant is as simple as putting a seed in the ground, and letting nature do it’s thing. Cannabis is a hardy, fast-growing plant that thrives in a range of environments. This article covers the basics a first-time grower needs to know.
What You Need
To categorize what a cannabis plant needs, we can break it down like this:
- Light — The Sun, or a grow light indoors
- Growing medium — Soil, coco coir, or a hydroponic system
- Water — Clean, pH-balanced water (6.0–7.0 for soil, 5.5–6.5 for hydro/coco)
- Nutrients — Cannabis-specific fertilizers, or amended soil that already contains them
- Airflow — The wind, or a fan to strengthen stems and prevent mold and infestations
- A container — Fabric pots, plastic pots, or directly in the ground outdoors
Choosing Seeds
The first decision is what kind of seed to grow. There are two main types:
- Photoperiod — Flowering is triggered by changing the light schedule to 12/12. The grower controls how long the plant vegetates, allowing for larger plants and techniques like cloning. Best for growers who want more control.
- Autoflower — Flowering begins automatically based on age, regardless of light schedule. Faster from seed to harvest (8–12 weeks) and simpler to manage. A good choice for beginners.
Seeds are also broadly categorized by genetics:
| Type | Characteristics |
|---|---|
| Cannabis Indica | Shorter, bushier plants; typically faster flowering |
| Cannabis Sativa | Taller, leggier plants; longer flowering period |
| Hybrid | A cross of indica and sativa; most modern strains are hybrids, but they will have certain physical characteristics leaning towards Indica or Sativa |
Feminized vs. Regular Seeds
- Feminized seeds are bred to produce only female plants , which are the ones that grow consumable flowers. Recommended for beginners.
- Regular seeds have roughly a 50/50 chance of being male or female . Males must be identified and removed before they pollinate the females.
Indoor vs. Outdoor
Indoor
Growing indoors gives the grower full control over the environment — light, temperature, humidity, and airflow. It requires more equipment but produces consistent results year-round.
A basic indoor setup includes:
- A grow tent or dedicated space
- A grow light (LED is the most common choice for beginners)
- An exhaust fan with a carbon filter (for odor control)
- A small oscillating fan
- Pots and soil or coco coir
- A timer for the light schedule
Outdoor
Growing outdoors is simpler and cheaper. The sun provides free, full-spectrum light that no grow light can fully replicate. However, the grower is at the mercy of the seasons, weather, and pests (though pests can also be common in indoor grows).
Outdoor plants are typically started in spring and harvested in autumn. In the Northern Hemisphere, photoperiod plants usually finish between September and October.
The Growth Cycle
Cannabis goes through distinct phases:
| Stage | Time | Description |
|---|---|---|
| Germination | 1-7 Days | Seeds are placed in a moist environment until they sprout a taproot. Common methods include placing seeds between damp paper towels, directly in soil, or in a glass of water. |
| Seedling | 1-3 Weeks | The young plant develops its first sets of true leaves. Seedlings need gentle light, consistent moisture, and warm temperatures (20–25°C / 68–77°F). Overwatering is the most common mistake at this stage. |
| Vegetagive | 3-16 Weeks | The plant focuses on growing stems and leaves. Under long light schedules (18/6 is standard), the plant will continue to vegetate indefinitely. During this phase the grower can train the plant, transplant to larger pots, and begin feeding nutrients. |
| Flowering | 8-12 Weeks | The plant produces flowers (buds). For photoperiod plants, this phase begins when the light schedule switches to 12/12. For autoflower plants, it begins automatically. Nutrient needs shift during flowering, with higher demand for phosphorus and potassium. |
| Harvest | Buds are ready to harvest when the trichomes (tiny resin glands on the flowers) shift from clear to milky white, with some turning amber. After cutting, buds need to be dried and cured for the best flavor and potency. |
Common Beginner Mistakes
- Overwatering — The most frequent issue. Let the top inch of soil dry out before watering again.
- Too many nutrients — Start at half the recommended dose and increase gradually. Signs of excess include burnt leaf tips.
- Poor pH — Nutrient lockout occurs when the pH is out of range. A simple pH meter and pH-up/down solutions prevent this.
- Not enough airflow — Stagnant air invites mold and weakens stems.
- Harvesting too early — Patience pays off. Use a magnifying glass to check trichome color.