neem seed meal fungus gnats

neem seed meal and fungus gnats


anyone ever use this to stop fungus gnats in there soil or does anyone even have experience with using this period in there soil? if so how much do you mix into the soil or is it done via top dressing?


I have the same brand of neem seed meal. I do use it in my soil and as a top dress and as a soil drench.
I have found that it will help with the fungus gnats. I had them pretty bad a couple weeks ago in the indoor garden as well as my potted rose plants outside.
I top dressed each container with around 1/4 cup.
I also put about 1/2 cup in 3 gal or so water, let it sit or bubble it then use it as a soil drench. It took a day or two but no more gnats.
Letting the soil dry out a bit helps a ton also.

UP is the man when it comes to neem and karanja seed products and oils.
Hopefully, he will pop in with some knowledge.


It’s a different brand but this neem site has information on using it. Hopefully you will find it helpfull. I’ve just bought some neem products but have not used the cake(meal) yet.

Udyana Peace

In use neem seed meals for every plant that I grow – medicine, fruit, trees, vegetables, flowers, etc.

The specific product that you are asking about is from Dyna-Grow which distributes a very fine neem seed oil and this seem meal is the residue from the manufacturing. Dyna-Grow imports the seed meal (aka ‘cake’) and distribute it through a license agreement with Down-To-Earth. I used this brand for 3 or 4 years and would do so again if the organic product became unavailable.

Tip for fighting gnats (fungus and otherwise) – take 1 cup of neem seed meal and 1/2 cup of kelp meal. Put it into a mesh bag and drop it into 5 gallons of clear water. Let sit for a couple of days.

Apply as a soil drench and as a foliar spray. If you have an air pump then use an air stone and bubble it for 36 – 48 hours. You don’t have to do this step but I’ve found that if the particles are bouncing around they seem to break down further than just sitting in water.

Something like that.

Udyana Peace

This link is to an article from the University of Walkato’s digital libary collection in New Zealand. It’s probably the best analysis of neem available to the general public.


i cant + rep you anymore UP. ill check the link for sure and bubble that kelp and neem. if you stop back by whats your thoughts with karanja especially it + neem mixed into soil, seems like a couple people use the two together around the net.

thanks primeform right now gnats are not a major problem just a nuance i had no idea about fungicides killing there food supply though thanks!


I’m answering your PM on this thread because perhaps others can benefit from the information.

Dyna-Gro Neem Seed Oil is a very fine product and is easily sourced around the country. Unfortunately when discussing neem oils the discussion almost always revolves around a single compound in this oil – Azadirachtin

This is pretty stupid since Azadirachtin is only 1 of 320 compounds found in neem and karanja seed oils. Specifically this compound is a terpenoid – fair enough.

Having said that, Azadirachtin is only one of 20 terpenoids found in neem and karanja trees. It would be like discussing the benefit of eating citrus fruits and simply focusing on Vitamin C – pretty stupid.

The Dyna-Gro Neem Seed Oil is a very fine product and one that I’ve used for several years. The level of Azadirachtin specifically is 1500 ppm as per the Dyna-Gro company. And it’s a cold-pressed oil which retains much of the beneficial compounds vs. the chemical extraction process used on garbage like Azatrol and Azamax.

The neem tree products from The Ahimsa Foundation ( is organic. The product comes out of Southeast India in the ancient neem groves going back to the 16th Century. The Azadirachtin levels in this specific product is 4500 ppm – i.e. 3x the levels in the Dyna-Gro Neem Seed Oil

It’s human food-grade, fair trade and cheap, cheap, cheap. If you hit their web site look at the horizontal menu bar across the page and hit ‘Sample Packs’ of which there are 3 deals available. All of them a killer pricing.

Here’s the mix that I use with their products to completely, totally, absolutely prevent mites, PM, thrips, etc.

1/2 tablespoon of organic neem oil
1/2 tablespoon of organic karanja oil
1 tablespoon of Dyna-Gro Pro-TeKt (liquid silica and is the perfect emulsifier for these oils)

Mix in a ‘rock glass’ until you get an even solution. Add this in small amounts to 1 gallon of TEPID water (i.e. 65F – 75F) and slowly. Higher temps diminish the effectiveness of these oils. Once you get that done you now need to add a surfactant to make this mix ‘stick’ to the leaves and branches.

I recommend using liquid yucca extract (again you want to get organic human food-grade meaning no preservatives) – this is available at T & J Enterprises in Spokane, Washington.

Once you have the oils and liquid silica in the spray tank add 1 oz. (2 tablespoons) of the yucca extract. Close the tank and shake as hard as you can to activate the saponins in the yucca extract.

Hit each and every leaf on the top and bottom (especially) until it looks like you haven’t watered your plants for a couple of weeks, i.e. leaves hanging down and generally looking pretty sh*tty. Shut down the lights and let them sit in the dark until the next ‘on cycle’

Repeat every 4 or 5 days for at least 3 applications. This will break the adult-egg-larva cycle much like dealing with fleas on you dogs and cats perhaps.

If you want you can also use organic aloe vera juice and I add 1.5 ounces (3 tablespoons) to each gallon of the neem/karanja and water mix. George’s is a good product and certainly inexpensive enough. It’s organic and has NO preservatives. 90% of aloe vera products do use one of the following or all of them: sodium benzoate, citric acid and potassium sorbate. Cute, eh?

Both of these neem and karanja oils are the finest that I have been able to find. If there’s anything better I would be happy to check it out, i.e. I’m not closed-minded on this deal.

I can’t recommend these products enough and at the price in their sample packs vs. Dyna-Gro and ESPECIALLY the sh*t from a company called ‘Einstein Oil’ this product provides bottom-basement pricing. Einstein Oil is $65.00 for 1 pint or $520.00 per gallon.

The organic neem oil from The Ahimsa Foundation is around $75.00 per gallon. Heh. UP

anyone ever use this to stop fungus gnats in there soil or does anyone even have experience with using this period in there soil? if so how much do you mix…

Too much neem cake or oil bad for soil/plant?

PLEASE HELP! I can’t seem to find any information on what happens if I’ve used too much neem cake. Will it hurt my plants? I can’t seem to get rid of the fungus gnats. I’ve mixed a bit too much neem cake into the soil but I can’t help spraying neem oil to the top of the soil when I see so many flying around. It’s been a war for about a month now.
Any information or suggestions much appreciated, thanks.

Never heard of neem cake till now. I have always used neem seed meal along with just about every other meal in my soil mix. I know it makes a hot mix that I let cook for a month or so before using. Not sure how much of that is the neem. . I know gnats like moist soil. Dont water till the soil dries out alot or as much as you can get away with. Also a small layer of sand they do not like. They lay egs or whatever in the soil and the sand makes them think the soil is to dry. You can even use a colored decorative sand if you like.

Thanks for the advice. Neem cake and neem seed meal, I think, are the same thing. I do have 2 inches of fine sand on top but still see them crawling around. Diluted hydrogen peroxide seems to help too but still not enough to get rid of gnats. Guess I’ll have to wait till summer when everything can dry out all together. I’m just upset because of all the time and money I spent on seedlings and plants. Ugh, never thought gnats can cause so much damage

I have used Mosquito Dunks very successfully against fungus gnats. Just google it for the different ways you can apply it.

I bought the dunks, crumbled it in water and let it sit for awhile before I poured it on my soil. I see they also now have a Mosquito bits.

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