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marijuana plant growing problems

Marijuana plant growing problems

Inspect under fan leaves, as that’s where some bugs live—such as spider mites—and check where the stalk comes out of the soil, as some bugs live there too—in particular, root aphids.

New growers are often guilty of giving their new weed plants too much love. As we’ve mentioned before, it’s called weed for a reason—a lot of times the answer is to just let the plant be.

Check out Johanna’s full video series on how to grow weed on Leafly’s YouTube .

Also, keep an eye on the pH of water you use on your weed plants. This overlooked aspect can quickly lead to big problems.

Too many nutrients

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!

Many issues can arise when growing weed: discoloration of leaves is usually a sign of nutrient deficiency; tiny spots or webbing can mean a bug infestation; stunted growth can be a root problem.

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.

Common mistakes when growing marijuana

This can manifest in overwatering. A new grower may overthink watering and water too much.

Look for and remove dead or yellowing leaves, and weak or withering branches. If plants are flowering, look for bud rot and mold.

Marijuana plant growing problems

One of the reasons you need great air circulation is your plants “breathe” CO2 during the light hours, almost like we breathe oxygen. Unless your plants are in a big open space with lots of air, or you are supplying your plants with CO2, you need to have some sort of exhaust system to pull away hot, stale air and bring in new fresh air for your plants.

Monitor the temperature and humidity with a thermometer/hygrometer in your grow space

Step 3: Check Environment

When you look closer, you can see the entire inside has started molding and rotting This entire bud had to be tossed, and the rest of the plant was harvested immediately before it kept spreading.

Leafhoppers look pretty, but they munch on your plants so don’t ignore them!

Step 4: Identify Light Issues

You can get some pretty fancy humidity gauges to place in your grow room, and products to help change the humidity are commonly found at department stores, hardware stores, or most stores that sell home appliances. There are also some DIY options discussed in our complete article about controlling indoor humidity.

Marijuana plant growing problems

Epsom salt is particularly useful because it also includes sulfur and helps cultivators fight off sulfur deficiencies. Sulfur deficiencies can occur during the vegetative phase and the flowering phase, and can be hard to differentiate from a magnesium or nitrogen deficiency.

It is very common for a cannabis cultivator to see a cannabis plant that looks unhealthy and assume that cannabis nutrient deficiencies are to blame. That is especially true for beginner cannabis cultivators who are seeing a struggling cannabis plant for the first time.

Magnesium deficiencies are more common during the flowering phase, however, they can occur during the vegetative phase as well. Magnesium deficiencies show on leaves in the form of interveinal yellowing versus the all around yellowing that occurs with a nitrogen deficiency. The easiest way to address a magnesium deficiency is to include more epsom salt in the feeding schedule.

Common Nutrient Deficiencies During The Vegetative Stage

The amount of water that the plants are being fed is another factor that can affect nutrient uptake. If a cannabis plant is not being fed enough water, it won’t be able to absorb enough nutrients. Conversely, if a cannabis plant is being watered too often, it won’t be able to absorb enough nutrients.

Phosphorus deficiencies are fairly rare with cannabis plants, however, they do occur. When older leaves on the plant start to experience brown spotting, or another dark color, and growth has slowed and new leaves are really small, it’s likely due to a phosphorus deficiency. Remove the spotted leaves and boost feeding with a phosphorus-rich nutrient product (they are very common at gardening stores).

Even if other factors can be confidently ruled out, it is still possible that it’s not the nutrients themselves that are the cause of the issue. It’s quite possible that the cultivator is feeding their plants the right amount of nutrients yet the marijuana plants are not absorbing them properly due to one or more reasons.

Is It Really A Nutrient Deficiency?

Make it a point to start every garden day with a thorough visual inspection of every part of every cannabis plant in the garden. Pay close attention to the bottoms of every leaf, and pay special attention to the older leaves. Obviously, you want to keep green leaves in place, however, if you see leaves that look like they are dying or look noticeably unhealthy, remove them immediately.

Frequently perform as many types of level-based tests as possible — monitor pH levels in the water and soil, EC levels, PPM, total dissolved liquids, and anything else that you can afford to perform tests on. The more types of data that you can acquire the better. It is somewhat common that a leaf is visually showing an issue, yet that issue is not reflected in the soil, water, or tissue testing.