My Store:

Where would you like to shop?


352 Queen St unit 4, Acton, ON
L7J 1W6, Canada

Select Store


115 Talbot St W, Aylmer, ON N5H
1J6, Canada

Select Store


20 Bridge St W, Belleville, ON K8P
1H7, Canada

Select Store


153 West St, Brantford, ON N3T
3G4, Canada

Select Store


43 Main St, Brighton, ON K0K 1H0,

Select Store


2107 Parkdale Ave E, Brockville, ON
K6V 5W1, Canada

Select Store

Cambridge - King

960 King St E, Cambridge, ON
N3H 3P3, Canada

Select Store

Cambridge - Main

51 Main St, Cambridge, ON N1R
1V6, Canada

Select Store


52 Bridge St E, Campbellford, ON
K0L 1L0, Canada

Select Store

Chatham King

85 King St W, Chatham, ON N7M
1C7, Canada

Select Store

Chatham McNaughton

170 McNaughton Ave W,
Chatham, ON N7L 1R4, Canada

Select Store


25 Second St E, Cornwall, ON K6H
1Y2, Canada

Select Store

Fort Erie

201 Jarvis St, Fort Erie, ON L2A 2S7,

Select Store


4 Courthouse Square, Goderich,
ON N7A 1M3, Canada

Select Store

Grand Bend

31 Ontario St N, Grand Bend, ON
N0M 1T0, Canada

Select Store


125 Muskoka Rd S, Gravenhurst,
ON P1P 1X3, Canada

Select Store

Guelph Gordon

951 Gordon St #8B, Guelph, ON
N1G 4S1, Canada

Select Store

Guelph Wellington

715 Wellington St W, Guelph, ON
N1H 8L8, Canada

Select Store


326 Ottawa St N, Hamilton, ON
L8H 4A1, Canada

Select Store


513 11th Ave, Hanover, ON N4N 2S3,

Select Store


30 Main St E, Huntsville, ON P1H
2C8, Canada

Select Store


18 Circle St, Kapuskasing, ON P5N
1P4, Canada

Select Store


4396 King St E #1, Kitchener, ON
N2P 2G4, Canada

Select Store


3 Erie St S, Leamington, ON N8H
3A6, Canada

Select Store


780 Wallace Ave N, Listowel, ON
N4W 1M2, Canada

Select Store


212 King St #1, Midland, ON L4R
3L9, Canada

Select Store


1370 Dundas St E #7, Mississauga,
ON L4Y 4G4, Canada

Select Store


7 Market Square, Napanee, ON
K7R 1R3, Canada

Select Store

New Liskeard

324 Whitewood Ave W, New
Liskeard, ON P0J 1P0, Canada

Select Store

Niagara Falls

4695 Queen St, Niagara Falls, ON
L2E 2L9, Canada

Select Store

North Bay Main

496 Main St E, North Bay, ON P1B
1B5, Canada

Select Store


1076 Cedar St, Oshawa, ON L1J
3R9, Canada

Select Store


1262 Wellington St. W, Ottawa, ON
K1Y 3A5, Canada

Select Store

Owen Sound

978 3rd Ave E, Owen Sound, ON
N4K 2K9, Canada

Select Store

Parry Sound

34 Seguin St, Parry Sound, ON P2A
1B1, Canada

Select Store

Port Colborne

349 King St, Port Colborne, ON L3K
4H2, Canada

Select Store


129 Mitton St S, Sarnia, ON N7T
3C5, Canada

Select Store

Sault St Marie

898 Queen St E, Sault Ste. Marie,
ON P6A 1Y7, Canada

Select Store


22 Robinson St, Simcoe, ON N3Y
1W4, Canada

Select Store

St. Catharines

92 Pelham Rd, St. Catharines, ON
L2S 1T1, Canada

Select Store


673 Ontario St, Stratford, ON N5A
3J6, Canada

Select Store


51 Front St W, Strathroy, ON N7G
1X6, Canada

Select Store


372 Riverside Dr, Sudbury, ON P3E
4K3, Canada

Select Store


110 Broadway, Tillsonburg, ON
N4G 3P6, Canada

Select Store

Timmins Riverside Drive

670 Riverside Dr, Timmins, ON
P4N 3V9, Canada

Select Store

Timmins Third Ave

214 3rd Ave, Timmins, ON P4N 1E1,

Select Store


82 Division St, Trenton, ON K8V
4W5, Canada

Select Store


740 James St, Wallaceburg, ON
N8A 2P5, Canada

Select Store


16 Steel St, Welland, ON L3B 3L9,

Select Store


1368 Ottawa St, Windsor, ON N8X
2E8, Canada

Select Store

Close Icon

Common Cannabis Plant Problems Growers Experience

Published On:
April 11, 2024

Read time:
5 Minutes

A cannabis plant with wilting leaves surrounded by a field of healthy plants

Growing cannabis can be immensely rewarding, but it also comes with its fair share of challenges—even for experienced growers.

If you’ve noticed your plants are looking a bit off, maybe they have yellow leaf tips or weak stems, or perhaps something is moving in the soil… these are all red flags that need to be addressed sooner rather than later.

But don’t panic yet, rookie cultivator! Your cannababies are probably just going through a rebellious phase. Keep reading to learn about common cannabis plant problems and the steps you can take to get them back on track.

Cannabis Plant Pests

Yes, your cannabis plant can get bugs, bugs, baby. These little critters are the bane of any grower’s existence. They feed on plant sap, weakening the plant and potentially spreading diseases.

Check for symptoms like yellowing or discolouration, stunted growth, webbing or sticky residue on leaves, holes, wilting, and swarming bugs. The key is acting quickly once you spot the signs! These pests multiply rapidly and can decimate your cannabis plants if left unchecked.

Look out for these common cannabis pests:

Even easy-to-grow indoor plants aren’t entirely safe from them, so stay vigilant when checking for this cannabis plant problem!

Closeup of a plant stem with an aphid infestation

Image Source: Shutterstock

How to Get Rid of Cannabis Plant Pests

Prevention is key—but if you suspect pests are the problem, here are some steps you can take:

  1. Maintain a clean grow space and inspect any new plants thoroughly before introduction (we recommend using a magnifying glass!).
  2. Maintain excellent air circulation and prune undergrowth to avoid humidity/moisture buildup where pests thrive.
  3. If you notice any cannabis leaf problems like yellowing or holes, act quickly.
  4. Use gentle, organic insecticidal soaps, neem oil, or other botanical sprays approved for cannabis plants as instructed.
  5. For severe infestations, you can introduce predatory insects like ladybugs or lacewings.


Your cannabis plants can get sick. Like humans, they’re susceptible to diseases that can cramp their style if not treated quickly. Most of the time, the issue lies in humidity or moisture levels not being regulated.

Plant health is determined by the environment in which it grows—too much dampness and poor air circulation can create the perfect petri dish for funky fungi and icky bacteria to take over. Mould, powdery mildew, and bud rot are typical symptoms of a sick plant—one of the most common cannabis plant problems growers experience.

How to Treat Cannabis Plant Disease

Here are some tips on how to nurse your plant back to health:

  1. Control the environment to prevent outbreaks by improving air circulation and keeping the grow area clean with fans and dehumidifiers.
  2. At the first sign of mould or mildew, remove the affected areas.
  3. Treat plants with a fungicide safe for cannabis with ingredients like copper, sulphur or potassium bicarbonate.
  4. Sanitize your whole grow area and equipment to prevent repeats.
  5. Regularly inspect plants, especially during the dense flowering phase.

Nutrient Deficiencies

Cannabis plants are sensitive to their nutritional environment, so it’s no surprise that cannabis deficiencies are one of the most common issues for growers.

Weed plant deficiencies can be observed in the leaves. Cannabis leaves that are turning yellow, curling up or down, or developing strange spots and stripes, are all signs your plant has a nutrient deficiency. The culprit to this issue is likely the cannabis soil or the nutrient solution (if you’re using a hydroponics system).

Cannabis plants are like hungry teenagers—they need a rich, balanced diet of nutrients to thrive. Just like a moody adolescent, they’ll let you know loud and clear if their nutritional needs aren’t being met in the form of cannabis leaf problems or worse.

So, what do these “hangry” signs look like? Here are some common cannabis nutrient deficiencies and their symptoms:


Nutrient Deficiency Plant & Leaf Symptoms
Nitrogen Deficiency The entire plant turns pale green/yellow from the bottom up; stunted plant growth
Phosphorus Deficiency Leaves turn dark green/red/purple, especially undersides; stunted plant growth
Potassium Deficiency Yellowing/browning starts at leaf tips/edges and moves inward
Magnesium Deficiency Yellowing between leaf veins on older leaves; leaves curl/crinkle
Iron Deficiency The whole plant turns pale yellow/white while the veins remain slightly green
Calcium Deficiency Crinkling, deformed new growth; brown spots on leaves
Manganese Deficiency Dull yellowing between leaf veins
Zinc Deficiency Younger leaves start yellowing between veins
Boron Deficiency Brown blotches in the centre of leaves
Copper Deficiency Twisted, distorted leaves
Sulphur Deficiency The entire plant turns pale green/yellow; overall slow growth
Molybdenum Deficiency Older leaves turn pale green/yellow from the center outward


How to Treat Nutrient Deficiencies in Cannabis Plants

As you can see, some plant and leaf symptoms overlap. So while these signs can be a good reference for weed plant deficiencies, it’s still a good idea to do a soil test to know for sure.

You also want to get your hands on a pH metre. Cannabis plants can only properly absorb nutrients within a specific pH range (typically around 6.0-7.0). If pH is off, the nutrient lockout will occur no matter how much of a certain nutrient you provide.

Regularly monitor your soil’s pH, use balanced cannabis-specific fertilizers, and adjust based on the plant’s growth stage. For example: Nitrogen is crucial in its vegetative stage, while phosphorus and potassium are more important during flowering. If plants develop a deficiency, foliar sprays can be a quick, effective remedy.

🌿 Read more: The Anatomy of a Cannabis Plant and Its Life Cycle

Cannabis plants with browning leaves, a common cannabis leaf problem

Image Source: Shutterstock

Environmental Stress

Cannabis plant problems can occur simply due to environmental factors. The wrong environment can take a toll on your plants, leading to cannabis leaf deficiencies or worse. Common causes of environmental stress in cannabis plants include:

To keep your plants happy, make sure their environment is just right. Both the vegetative and flowering growth states have specific temperature needs and light requirements.


Vegetative Growth State Flowering State
20-30°C (70-85°F) 18-24 hours of light 18-26°C (65-80°F) 12 hours of uninterrupted darkness


💡 Pro Tip: For indoor grows, use high-quality LED or HID grow lights positioned at the appropriate distance from the canopy to provide sufficient light intensity without causing heat stress or other cannabis plant problems.

Grow Your Cannabis Know-How—Become a Budtender at True North!

Are you captivated by the art and science of cannabis cultivation? Do you find yourself eager to share your knowledge and help others navigate their cannabis journey? If so, we want you on the True North team!

Join us as a True North budtender and become a pivotal part of our community-focused dispensary. This is your opportunity to transform your interest in cannabis into a rewarding career!

Apply at your nearest True North Cannabis Co.—we can’t wait to grow together!

Share this article

Keep Reading

Best Small Towns in Ontario You Need to Visit

Read the Article

How To Hide Your High: 8 Foolproof Ways to Hide The Fact That You’re Stoned

Read the Article

Working Out High: Can Cannabis Improve Performance?

Read the Article

Find your
True North

True North Cannabis has democratized the industry making quality cannabis affordable, and accessible for our customers.

True North Cannabis Co. Logo

Are you over 19?

Welcome to True North Cannabis Co!

Please verify your age to enter.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Shop Cannabis