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What Do Cannabis Plants Need ?

Caring for your Marijuana Plants

Written by Neal Brown . Updated: October 28, 2021

Common Cannabis Plant Problems and How to Spot Them

If, like an ever-growing number of people, you’re thinking of cultivating your own cannabis-based field of dreams, several forces of nature are working against you. No matter which growing techniques you use or how diligent you are when caring for those plants, certain problems are going to arise. Though some strains of marijuana are known for having few maintenance needs, all of them are still vulnerable to a long list of potential problems.

Starting Out with the Right Seeds

One effective way to make sure your marijuana plants get off to a great start in life is to begin with high-quality weed seeds. At Weed Seeds USA, that’s what we’re here for. We offer an extensive selection of marijuana seeds from a vast range of strains. Whether you’re looking for feminized CBD seeds, high-THC autoflowering strains, or anything in between, we have what you need.
All our seeds are carefully curated and stored in the perfect conditions to ensure the highest possible germination rate. Of course, we realize that finding the best seeds to kickstart your cannabis garden is only the beginning. From there, you have to see them safely through the vegetative and flowering stages.

Because of that, we’ve also provided numerous insightful resources to help you keep your weed crop healthy and boost its yields. Here, we’ll clue you in on some warning signs of common plant problems you might face between the planting and harvesting phases.

Maintaining the Right Nutrient Balance

You probably already know that plants need certain nutrients to flourish. Some are macronutrients, or elements plants require in larger quantities. Others are micronutrients. Those are the nutrients plants need in smaller amounts. They’re still essential; the plants just don’t need as much of them to stay healthy.

Looking at Macronutrients

Plant macronutrients include oxygen, hydrogen, carbon, magnesium, sulfur, and calcium, but the primary necessities are nitrogen, phosphorus, and potassium. Those are the big three you’ll see listed on fertilizers and plant foods as N-P-K. If plants don’t get enough of those, they’ll start to falter.


Nitrogen is vital for plant growth, chlorophyll production, and metabolizing nutrients into food. If cannabis plants aren’t getting enough nitrogen, they won’t be healthy. One noticeable warning sign of a nitrogen deficiency is yellowing leaves. Since they’re not getting enough nitrogen to produce the chlorophyll that makes them green, they won’t be as green as they should be.

Another indication of a nitrogen deficiency is slow plant growth or no new growth at all. As is the case with humans, a lack of essential nutrients can stunt growth. That means your marijuana plants won’t get any taller. Keep in mind, those plants need even more nitrogen during the flowering phase. Otherwise, they won’t produce the big, juicy, potent buds you want to see.

On the other hand, if you give them too much nitrogen, it’ll detract from the buds’ potency, aroma, and taste. An overabundance of nitrogen could even halt the budding process. Too much nitrogen can make the plants’ leaves droop and turn yellow as well.


Phosphorus is crucial for healthy plants as well. Plants need this macronutrient to help them soak up sunlight for photosynthesis and to generate enough energy to grow. Phosphorus also contributes to root and stem health. If your plants aren’t getting enough phosphorus to keep their roots healthy, they won’t be able to draw in other nutrients as well as they should.

Plants that are suffering from a phosphorus deficiency will first begin to turn a dark green color, even darker than they should be. From there, older leaves near the bottom of the plant will start to become discolored with black, bluish, or brown spots. They’ll actually look a bit bruised. Additionally, any new leaves that sprout during a phosphorus deficiency will be much smaller than they should be.


Like other macronutrients, potassium is crucial for plant growth. It helps plants produce and use various enzymes. It also aids plants in transporting food and water throughout their stems and leaves and carrying out photosynthesis. Potassium helps plants to create the proteins they need to carry out vital functions, too. This nutrient can also help make plants more resistant to diseases and help them survive a little longer if you forget to water them.

Plants that are lacking in potassium can quickly grow taller than those around them, but they won’t be strong enough to support that extra height. They also develop brown or yellow discoloration around the edges of their leaves. Those leaves will begin to die and fall off the plants in time.

We should mention that it’s rare for plants grown in hydroponic systems to suffer from potassium deficiencies. Those grown outside or indoors in various media are more prone to this issue, though.
What do Weed Plants need?
What do Outdoor Cannabis Plants need ?
What do indoor cannabis plants need ?

What do Weed Plants need?

What do Outdoor Cannabis Plants need ?

What do indoor cannabis plants need ?