Free Tropical Runtz seeds on orders over $150!

1. Dealing With Cannabis Nutrient Burn

Cannabis nutrient burn can be a tough problem to diagnose and deal with. It can strike just when you think you’ve got your feeding schedule figured out.

Most people begin their cannabis cultivation journey with a grand goal in mind. They envision a simple, linear path from seed to harvest with few obstacles. While there are far more difficult things to achieve than growing cannabis, the fun does come with several difficulties, such as cannabis nutrient burn. Learn all you need to know about cannabis nutrient burn in this article, including what causes it, how to identify it and how to prevent it.

What is cannabis nutrient burn?

One of the most familiar novice cannabis growing issues is nutrient burn, also known as fertilizer burn or “nute burn.” Too many nutrients at the roots cause the yellow or brown leaf tips, which causes the plant’s water flow to be disrupted and causes cannabis leaves burning on the tips. When a cannabis plant’s roots take in more nutrients than they can use, the excess causes problems with water flow, resulting in brown or bronze “burns” on the tips of the leaves.

Nutrient Burn cannabis leaves
Nutrient burned cannabis leaves outdoors.

If nutrient levels are not reduced, the burn cannabis plant begins to travel inwards, and the leaves’ ends become crispy and twisted. The tips become bronze, crispy, curled, and occasionally twisted as the cannabis nute burn progresses. Even though you can prevent the nutrient burn from getting worse, the burnt look on already-affected leaves will not disappear.

How to identify cannabis nutrient burn

In cannabis nutrients, nitrogen is the most abundant compound, especially during the vegetative stage. Numerous more severe symptoms will follow nitrogen burn cannabis. The tips of your cannabis leaves will turn yellow, gold, or brown as the first signs of nutrient burn appear. Only the tips of your leaves will be affected by a mild case of nutrient burn or deficiency.

Browning cannabis leaves

The yellow tips will turn rusty brown and crispy over time. If the problem is not addressed, you may notice the burn spreading from the tips to the entire leaf. If you haven’t already, you should treat your plant as soon as possible to prevent severe nutrient burn.

Nutrient burn during flowering

Cannabis nutrient burn can have an impact on buds. Cannabis plants spend the first part of their lives in the vegetative stage. When cannabis plants reach the flowering stage of their lives, they stop focusing on the production of leaves and stems and instead concentrate solely on the production of buds. Cannabis plants are most vulnerable during the flowering stage because they cannot recover from problems. The further into the flowering stage you get, the less likely the plant is to replace a damaged or dead leaf. Cannabis changes how it uses nutrients during the flowering stage. The demand for nitrogen nearly vanishes, while demand for other compounds such as calcium and magnesium rises. Any additive overdose will result in the same type of burning symptoms. By the time harvest arrives, your plant has essentially given up on recovering from leaf damage and is solely focused on forming fat buds.

How to fix nutrient burn on cannabis plants

Cannabis nutrient chart
Cannabis nutrient feeding chart.

Use bottled nutrients

Nutrient burn cannabis or deficiency is usually caused by adding too many additional nutrients to the water. Use only nutrients designed for cannabis plants. Remember, if it works for tomato plants, it will work for cannabis. Make sure you are using the proper nutrients for your plant’s stage of development. The vegetative and flowering cycles have different requirements. You could endanger your plant if you don’t follow instructions correctly.

Soil or coco coir system

If you are growing in a hand-watered system (such as soil or coco coir), flush your system with pure, pH’ed water as soon as you notice indications of nute burn cannabis. If you are not adding any extra nutrients to your grow, wait until the plant has used up all of the excess nutrients in the soil. Once the nutes have been used up, the plant will naturally recover from the cannabis nute burn (old leaves will not heal up, but leaves should no longer have new brown or burnt tips).

Hydro system

One way to reduce the number of nutrients in your water is to thin it out with plain, pH’ed water. You could also try mixing a new batch that contains fewer nutrients. With hydro systems, always make these adjustments slowly. This system will result in immediate positive changes by replacing the water and reducing the nutrients accordingly. The expansion of the nutrient burn should come to an end. The tricky thing about hydro is that various strains thrive at different nutrient levels. Even if you give your plants the same amount of nutrients, one may develop nute burn while the other suffers from a deficiency. Plants absorb nutrients in different ways.

Nutrient burn or deficiency prevention

Use nutrients that are specific to cannabis

Make sure you’re consuming cannabis-specific nutrients. These are tailored to the species, and many are designed to help during specific stages of the growing cycle.

Use feed charts

Various cannabis plants react differently to the same amount of nutrients. It takes some trial and error to figure out how different cultivars react. The recommended dose on nutrient charts should be considered the maximum amount as a general rule. Begin much lower if your plants are susceptible to nutrient burn. Starting with 50% will keep you from getting burn cannabis plants.

Check PPM and EC

Keep track of the parts per million (PPM) and electrical conductivity (EC) readings in your hand-mixed nutrient solutions and runoff to avoid nutrient burn. These readings indicate how much nutrients are present in your nutrient preparations and growing medium.

Measuring PPM and EC

A total dissolved solids (TDS) meter is required to measure ppm. Place your device in the solution you want to test after calibrating it and ensuring it reads zero. You’ll need to add a conductivity tester to your toolkit to assess EC.

Use organic soil

Growing in organic soil offers a safety net of organisms around the root system, one of the many advantages. Plants grown in the soil are more resistant to overfeeding and other stresses. For the entire grow cycle, a well-prepared organic soil requires no nutrients, eliminating the risk of burning.

Picture of Ed Rushford

Ed Rushford

Ed Rushford’s impact on cannabis growing is undeniable. Though he tends to focus primarily on 2 areas, plant training techniques and dealing with disease, pests, and other problems, he has offered many insights into how cannabis plants live and grow. That’s not to say that Ed is unfamiliar with the complete life cycle of cannabis, from seed to harvest, but he uses his widespread knowledge to hone in on the minutia and niche areas of growing cannabis. Ed’s goal is to spread knowledge and allow for everyone to become better growers. 𝕏

Shop popular cannabis strains

Here's 20% Off On Us!

We want to help you get your hands on the seeds you want, take 20% off your next purchase when you enter your email below!

Here's 20% OFF On Us!

We want to help you get your hands on the seeds you want, take 20% off your next purchase when you enter your email below!