Connect with us

Hi, what are you looking for?

Grow

4 Reasons Why Your Pot Leaves Are Turning Yellow

4 Reasons Why Your Pot Leaves Are Turning Yellow

There are several different reasons why your pot leaves are turning yellow. A variety of factors cause chlorosis, the technical name for a reduction of chlorophyll that results in yellow leaves. This isn’t a definitive list; however, it’s always important to properly diagnose an issue before attempting to solve it. So here are four reasons your weed leaves are yellowing—and how to deal with them properly for a heavier harvest.

Not Enough Light

During photosynthesis, leaves take in light and carbon dioxide (CO2) and convert it into plant energy. Without enough light, leaves will begin to yellow and eventually slow growth to a standstill. Common incandescent house bulbs are severely insufficient, and fluorescent lights must be kept quite close to plants to be remotely effective.

The Fix: Increase the amount of light the plant is getting. This could mean lowering an existing grow light to the proper level above your plants’ canopy or investing in a stronger lighting unit. I highly recommend using HID (High Intensity Discharge) lighting, such as MH (Metal Halide) or HPS (High-Pressure Sodium) lighting for growing pot plants indoors. LED (Light Emitting Diodes) and Compact Fluorescents are a decent, if not perfect, alternative if heat or power usage is an issue.

Over or Under-Watering

Marijuana plants like a wet-dry cycle for their roots. Over- and under-watered plants will droop and soon show the telltale signs of chlorosis.

The Fix: Stop watering over-watered plants and increase watering for under-watered ones. Sounds easy, but it’s one of the most common mistakes beginner growers make. Lift your containers if you can to get an idea of what they feel like when soaked and how much less they weigh when dry.

pH Imbalance

pH or potential hydrogen is the measurement on a scale of 1-14 of the acidity or alkalinity of a soil mix or nutrient solution, with 7 being neutral. Soil pH should be kept between 6-7, while hydroponic pH should be 5.5-6.2.

Fluctuations outside these parameters will lead to nutrient lockout, preventing your roots from being able to take in food. Often misdiagnosed as a deficiency of nitrogen or iron, an undetected pH imbalance can compound problems further when more nutes are added. This creates an over-abundance of plant food in your root zone that your plants cannot absorb.

The Fix: Use a pH meter to measure the level of acidity or alkalinity of your soil and nutrient solution. Adjust using pH up or down accordingly. Bear in mind that these solutions come in concentrated form, so add them sparingly to raise or lower pH incrementally.

Nutrient Deficiency

If all other factors are in balance—light, water and pH—then the most likely culprit is a lack of food for your plants. Nitrogen and iron are the most common deficiencies that cause yellowing leaves, but it could be any number of macro or micronutrients as well.

The Fix: Water with a nutrient solution high in nitrogen. Plant food bottles typically display NPK ratio on the labels. N is for nitrogen, P for phosphorus and K for potassium. Choose the nutrient with a higher number at the beginning. They’re labels will say “Grow” or “Vegetative” as opposed to “Bloom” or “Flowering.” If you decide you have a lack of iron, foliar feed with chelated iron. You should see your leaves greening up within a few days.

Avatar
Written By

Danny Danko is a writer, photographer and the Senior Cultivation Editor of High Times magazine. He has selected High Times’ annual Top 10 Strains of the Year since 2005 and is also the creator and founder of the High Times Seed Bank Hall of Fame, author of The Official High Times Field Guide to Marijuana Strains and the forthcoming book Cannabis: A Beginner's Guide to Growing Marijuana. He hosts the podcast High Times presents "Free Weed from Danny Danko."

6 Comments

6 Comments

  1. Avatar

    Karen Densmore

    June 1, 2020 at 1:49 pm

    my plants leaves are turning yellow and some rusting, BUT the leaves feel wet and moist and fall off with just a little movement,what is happening with them , i cantfigure it out

    • Avatar

      MC

      June 24, 2020 at 7:42 am

      Having the same issue

      • Avatar

        Jill

        July 30, 2020 at 8:49 am

        My plants leaves are yellow around just the edges ???

  2. Avatar

    Brandon

    July 4, 2020 at 7:46 am

    I have some leaves that are yellowing only in the center and I also have very very slight curling on edges of couple leaves. But also 85 percent of the plant has green green leaves on it. I don’t understand can you help?

    • Avatar

      Timo

      July 9, 2020 at 12:41 pm

      I have the same issue so if you figure it out please post

  3. Avatar

    Burr

    July 7, 2020 at 6:21 pm

    Is it normal for a auto floweringinf Bruce banner plant to turn yellow, it was green and I transplanted it to a bigger pot.. it already has small buds on it.. please help because I don’t want it going to waste

Leave a Reply

Your email address will not be published. Required fields are marked *

Advertisement
Do NOT follow this link or you will be banned from the site!