If you’re 21 or older, Amendment 64 allows you to cultivate up to six marijuana plants in an “enclosed, locked space” in Colorado. (This is still illegal under federal law.)
Kayvan Khalatbari is operations head of Denver Relief, a marijuana-growing dispensary and consulting business, where every plant is tracked througout its growing life.
Answer: A big thing to remember with marijuana plants is that they need to flower to produce THC ( tetrahydrocannabinol, the chemical that gets people high) and other medicinal cannabinoids. In order to do that, they need 12 hours of light and 12 hours of total darkness a day.
Recommended grow lights for a small setup:
Look at your plants for at least a minute or two every day. It’s really easy to overlook problems if you just water them and go. Taking a minute to really look at each plant and its leaves will often reveal problems right as they’re starting.
Choose a quality grow light and keep it the recommended distance away from your seedlings for the fastest growth. Usually, the manufacturer of a grow light will have instructions on the proper distance from plants. However, sometimes you’ll see signs of light stress and may need to keep lights further away than recommended, especially for younger plants. If the light feels hot on your hand where your plants are, it definitely should be moved further away. Some of the fastest vegetative growth I’ve seen comes from CMH/LEC grow lights with a vegetative bulb, but most grow lights produce great vegetative growth when used correctly.
If you’re struggling with high humidity, you may need to add an exhaust fan to vent out humid air and bring in fresh air. If your plants are in a grow tent, typically an exhaust fan that’s set up properly can keep the humidity just a little higher than in the room. If the humidity is much higher in the grow space than the surrounding room, that means you need to help equalize the air with an exhaust/intake fan, or by blowing the air around. If the humidity of your actual room is high, no amount of fans can fix that. In that case, you’ll need either a dehumidifier (raises temperature, lowers humidity) or an AC (lowers temperature and humidity) to bring the RH into a better range. Read the full humidity tutorial.
3.) Optimize Your Grow Lights
Genetics make a difference. Some strains simply germinate and grow faster than others. On top of the genetics, seed storage matters. Older seeds tend to germinate slower and plants are often slower growing at first. Seeds stored in extreme temperatures may also be harder to germinate and easier to stunt.
These plants were grown under a 315 LEC grow light
Cold temperatures can also stunt plants or make them grow at a snail’s pace. This plant experienced a cold night under 50°F/10°C and was droopy the next morning. It took several days for the plant to recover and start growing normally again. To make things worse, cold temperatures cause plants to drink less, so they’re more likely to suffer from symptoms of overwatering when the temperature falls.
4.) Seeds / Genetics
Good drainage – Soil or coco should not seem muddy, dense, or thick. Water should be able to drain freely from the bottom of the pot (if there aren’t any drainage holes, you need to add some yourself). Learn about growing in soil or coco.
Unfortunately, plant pests like broad mites, spider mites, thrips, or even a ton of fungus gnats can slow down growth as the plant spends energy repairing the damage. Sometimes growers mistake the symptoms for a nutrient deficiency or other problem. If you’re noticing spots, patches, or anything unusual on your leaves, don’t ignore it!