neem oil for spider mites on cannabis

Neem Oil: The Organic Pesticide Of Choice For Cannabis

Neem oil can act as both a preventative tactic and cure for a number of insect and fungus problems. It doesn’t affect friendly insects and acts as a growth tonic that keeps marijuana vibrant. Neem oil is a must-have for the serious organic cannabis grower.



Neem oil affects a wide variety of insects and plays an important part in an organic pest and pathogen management program. Sometimes, it appears as a deep green or mustard yellow, dark red, or pale green colour depending on the region and the extraction method used.

The neem tree grows prolifically on the Indian subcontinent. It is prized for the powerful effects of the concentrated triglycerides and triterpenoids contained within its oils. Neem oil is pressed from the seed and fruit of the neem tree and has been used horticulturally and in Ayurvedic medicine for centuries.

The list of benefits of neem oil for the human body are quite astounding. Those interested in natural medicine will really find some interesting uses. To this day, neem soaps and cosmetics are still produced and preferred in India.

Neem Oil


The organic cannabis grower will find the benefits of neem oil to be a pest and fungus-free garden. Neem oil remarkably only targets bad bugs in your garden and leaves good bugs alone. A regular application will suppress spider mites and white flies, fungus gnats, and nasty nematode infestations. Ladybugs and butterflies, bees, and earthworms all remain unaffected.

Regular application also suppresses a number of other pathogens that can affect cannabis. Powdery mildew and rust, rose black spot, and other fungi endemic to humid and still conditions cannot take hold. Neem oil can also be watered into the growing medium to prevent or control root rot, while acting as a mild growth stimulant.

The application of neem every ten days acts as a prophylactic measure for pests and pathogens. Prevention is always the best policy. If there is not an active harm prevention policy in place, an infestation of some kind can occur. In this case, neem oil can also be used as a direct pesticide.

Examples Of Use:

  1. Removing the webs of spider mites, then spraying with neem will cure an infestation and return vigour to new growth.
  2. Fungus gnats are more difficult to control as they swarm, but leaf damage is far less with neem oil as the leaves become inedible. Used in conjunction with sticky strips, gnats can be brought under control quickly.
  3. When rinsed through the growing medium with water, neem destroys bad nematodes and makes the bodies bioavailable as nutrients.
  4. Aphids succumb quickly to neem oil, but it will not harm overfed lady bugs.
  5. With one application, leaf miner infestations disappear overnight.


How to mix 100% first press neem oil:
  1. 1 teaspoon of neem oil per litre of water. Neem oil is temperature sensitive and will solidify into neem butter or jelly at lower temperatures. This does not harm the oil; in fact, chilled neem will last much longer. A water bath of 30°C will return it to its liquid form for easy measuring.
  2. Warm water. It is always preferred to use warm water when mixing, then waiting for it to cool. The neem remains a liquid longer, and the surfactant emulsifies more efficiently. Use warm, not boiling water as some beneficial compounds can degrade.
  3. 4-5 drops of surfactant. Neem oil is hydrophobic on its own, and a surfactant needs to be used when mixing it with water. Standard liquid dishwashing soap, preferably non-phosphate, does a perfect job. Literally only use four or five drops per litre.

Once mixed, use an atomiser or one-hand pressure sprayer on the finest mist setting possible. Mist the top and bottom of the leaf surfaces. Turn plants 360° where possible to ensure complete coverage. When applied once every ten days, plants will have an invisible armour against pests and fungi.

Avoid using neem three weeks before harvest. The lingering oil can affect final flavours. Although, it would be very bad luck to have something go wrong in the last three weeks.

Used regularly during all growth phases, neem plays an important role in maintaining plant health. First, as pest and pathogen prevention. Secondly, as a topical solution if there is an infestation. Neem is an essential addition to any organic cannabis garden.

Neem oil controls over 400 different insects and a number of pathogens that can affect cannabis. Don't put up with pests any longer by purchasing neem oil.

How to Use Neem Oil for Cannabis Plants [Organic Pest Control]

When it comes to growing cannabis, there are so many different methods to choose from. But if you’re someone who likes to grow your cannabis plants in the most natural way possible, neem oil is a must-have product.

It can act as both a preventative tactic and cure for numerous fungus and insect problems. It also helps to keep the impact of the pest population to a minimum without harming beneficial organisms. This means you can keep a balanced ecosystem at your farm.

Many synthetic fertilizers and nutrients claim to be all-natural, but unfortunately, many are far from it. There are authentic organic alternatives, like diatomaceous earth, that work, but they aren’t nearly as effective as neem oil.

Research shows that there is a huge difference in the adverse effects that may come from chemical-laden products. So even if you plan to stay 100% organic, it’s still worth learning the ins and outs of the trade that will help you to naturally cultivate and protect a plentiful crop.

Finding non-toxic, safe pesticides for growing plants, and ones that actually work can be rather challenging. Many of us want to protect the environment, our food, and our families, but most non-man made chemicals out there aren’t all that effective. But there is one exception: Neem oil.

What Is Neem Oil?

Neem oil is a natural and safe insecticide, making it a great tool for organic cannabis growers. It’s harvested from the neem tree and is effective against many common cannabis pests. The neem tree produces a thick sap and grows predominantly on the Indian subcontinent. It has been used in India for centuries and is now the de-facto treatment for organic farmers worldwide.

Neem oil is made by pressing the oil out of the fruits and seeds of the neem tree. It’s a pure vegetable oil that has all the benefits of the tree’s natural pest resistance. The neem tree is notorious for the powerful effects of the concentrated triterpenoids and triglycerides contained within its oils.

What makes neem so unique is that it’s 100% natural and safe to use. It’s non-toxic to both humans and animals, and there are no negative effects on plants if you use neem oil properly.

Neem oil is known to be very effective against many of the common cannabis pests but works especially well against soft-bodied insects like aphids, spider mites, and whiteflies. It’s also fungicidal and effective against mold, fungi, and mildew.

How Neem Oil Works

Unlike some chemical insecticides, neem oil doesn’t kill pests right away when you apply it because it doesn’t work on contact. Instead, when applied, neem oil creates a hostile environment for reproduction and, over time, depletes the population.

The oil enters the insects and interferes with their reproductive system. Furthermore, the oily coating on the leaves impacts the viability of eggs. The environment becomes toxic to the pests, and after a few generations of low birth rates, the population collapses.

Typically, growers apply neem oil to plants in a diluted form as a foliar spray. It’s worth noting that many neem oil products give users instructions to dilute the spray with water only. However, this is not good advice!

Oil doesn’t dissolve well in water. To spray your plants with neem oil, the oil needs to break down so that it mixes with water and forms an emulsion. Some growers suggest adding a few drops of liquid soap to the water before you add the recommended neem oil amount.

Although this may work, it’s probably best to look for special insecticidal soap (“potassium soap”) to create your neem and water solution.

Neem Oil for Organic Cannabis Care

Neem oil is a fantastic way for organic cannabis growers to get a pest and fungus-free garden. Incredibly, neem oil only targets bad bugs in the garden and leaves good bugs alone. A regular application will suppress whiteflies and spider mites, nasty nematode infestations, and fungus gnats. Butterflies and ladybugs, earthworms, and bees all remain unaffected.

The regular application of neem oil also helps suppress various other pathogens that could affect cannabis. Rose black spots, powdery mildew and rust, and other fungi endemic to still and humid conditions cannot take hold. Neem oil can also be useful to prevent or control root rot while working as a mild growth stimulant.

Neem oil acts as a prophylactic measure for pathogens and pests when it’s applied every ten days. Prevention is the best practice. If there isn’t an active harm prevention policy in place, some kind of infestations can occur. In this instance, neem oil can also be used as a direct pesticide.

How to Use Neem Oil

Typically, Neem oil is applied as a topical foliar spray – a mixture of warm water, oil, and soap as an emulsifier. It’s important to coat as much of the surface as possible. For mites and other insects, it’s especially important to cover the underside of the leaf because that’s where they “hang out.” It’s virtually impossible for them to attach an egg to the oily surface.

Here’s a step by step guide for using Neem oil:

  • 1: Check your neem oil product for instructions on the correct percentage to use. Typically, the amount is very small: 0.1-0.2%. But be sure to read the label to get the exact amount.
  • 2: Mix the right amount of neem oil into your soapy water using a dropper.
  • 3: Add your soapy neem solution into a garden sprayer.
  • 4: Generously spray your plants from all sides – get the upper sides and undersides of the leaves. Spray just before the “dripping point” but ensure that the entire plant is well-covered. Shake the bottle frequently when you spray to keep the solution well mixed.

It’s also useful to spray the soil too because insects lay their eggs in the ground. Furthermore, the fatty acids in the oil are beneficial for the soil food web. If you don’t see immediate results, don’t be discouraged. Remember, neem oil doesn’t work by direct contact. Instead, it disturbs the hormonal systems of the insects, meaning it may take some time.

Neem oil should be applied to plants regularly – once a week is a great way to prevent pests. However, if you have an active pest problem, be sure to spray once every other day until you have the population under control.

Avoid using neem oil three weeks before harvest because the lingering oil may affect final flavors. That said, it would be very bad luck for something to go wrong in the last three weeks.

Final Thoughts on Neem Oil for Cannabis Growing

Finding an insecticide that is both non-toxic and effective can be challenging. But, neem oil is exactly that. It’s a great way to protect your plants without having to resort to harmful and toxic chemicals.

When used regularly during all growth phases, Neem oil plays an important part in maintaining plant health. It’s great for pest and pathogen prevention and is also a great topical solution if you have an infestation.

Neem oil is perfectly safe to use and can be harmlessly applied to cannabis plants, protecting them from fungi and insects. Basically, neem oil is an essential addition to any organic cannabis garden,

If you're looking for an organic way to control pests on cannabis plants, neem oil could be the answer. Here's everything you need to know.