Here are some common mistakes newbie weed growers make.
Similar to overwatering, beginning growers also have the tendency to give plants too many nutrients. A common misconception is that more nutrients equals bigger plants, so just keep adding more and more!
Common mistakes when growing marijuana
This is a bad idea and will quickly lead to nutrient lockout or other nutrient deficiencies. Nutrient lockout occurs when a weed plant can’t take in any more nutrients.
Overwatering cannabis plants
But the drying out of soil is important too—that’s how roots pull oxygen out of soil and into the plant. Additionally, standing water can stay in soil and cause root rot if not given enough time to dry out.
Similar to spider mites, aphids hang out on the undersides of the fan leaves, but they are green and have long legs almost like a grasshopper. They are pretty tiny as well so I also recommend using the trichome scope for looking at aphids on your leaves. You will see them crawling around and what aphids do is suck the nutrients and water out of your fan leaves, which causes them to wilt and die.
Nutrient burn is another common issue beginners and even expert growers often face, as they tend to get overzealous with feeding their plants. When it comes to nutrients, less is always more!
Nutrient burn is essentially what happens to your plants when you’ve been feeding them too strong of a nutrient mix, and/or too frequently. The edges of your leaves will begin to brown and look crispy like they were burned, and growth will slow down drastically.
One of the more common types of fungi you will encounter as a cannabis grower, white powdery mildew is often a result of too high a humidity in the grow room, coupled with low or no airflow. Eventually this powdery substance forms on your plants and continues to spread and make more mildew while eating up your cannabis plants.
(Read also: Growing Cannabis in Humid Conditions: Mold-Resistant Strains)
The temp should be as close to 75F at all times, and once it reaches the low 80s, plant growth begins to slow down. As the temp gets hotter, the fingers of the fan leaves will begin to taco or fold up longways.
When overwatering occurs, it means you’ll want to water less frequently. The best method for deciding when to water is by checking how dry the soil is. If it is dry all the way around and inch deep, then it is ready to water.
Don’t freak out if something does start to happen to one of your plants, as it’s not the end! The best course of action is to view the signs and symptoms on your plant and then compare them to the symptoms listed below. Once you find the right match, continue your research and follow the instructions for how to cure it and within a few days you should see signs of recovery!
Also remember that with most of the nutrient deficiency and leaf problems, the issue is pH levels. So always be sure to check that first before trying to increase any particular nutrient.
Spider mites, and most other pests, hide on the undersides of your fan leaves so always check that part of the plant as well.
Controlling your grow room humidity is one of the tricks that separates the expert growers from the beginners.
Recommended LED grow light in that range: HLG 300L R-Spec (I love this light!)
When marijuana plants are young, they are weak and cannot tolerate much light at all. Yet as they get older, and especially in the flowering stage, marijuana plants want almost all the light they can get.
Step 4: Identify Light Issues
A good growing environment is crucial to the health of your plants. When the temperature (and to a lesser extent the humidity) is too high or too low, your plants will not grow properly no matter what else you do. Plants seem unhealthy and buds just don’t fatten up. You may also end up with problems related to plant stress such as hermies.
When growing cannabis, the mantra when it comes to lights is usually “More is better!” To be honest…it’s true! More light usually is better!
Overwatering is easily the most common grow problem, but it can be tricky to diagnose. Go through this list carefully and if you suspect overwatering, check the link below to see pictures and get detailed solutions.
Even if you’re providing nutrients, plants may get nutrient deficiencies if the pH is off. This magnesium deficiency is the result of the pH being too low at the roots.