Martin M.
★★★★★VerifiedJun 27, 2025
Not sure why, but this stuff causes a great amount of micorrizia to form, or possibly it is fungal. But the plants love it. So far when top dressing and digging it in an inch or so it hasn't caused any burn problems. Top dressed my cucumbers and they greened right up. They are in an earth box and are running out again so I will be adding more. Along with some of the ProMix.
Paul H.
★★★★★VerifiedMay 11, 2025
Not only did I used it with my indoor plants but I used it in my two orchards as well. First my lower orchard with seemingly great response and then next my upper orchard. Could be a coincidence but I’ve noticed less pest issue and more green healthy growth. Just even intuitively something about this product feels powerful. I was hoping to get a repelling effect towards animals like voles, rabbits, and javalina it’s still too early to tell though for sure though. I’d recommend.
Jerome A.
★★★★★VerifiedApr 30, 2025
Good stuff. Pair it with the other product Build a Soil sells and you'll never have gnats. But the MSM works well alone. Adds a positive soil enhancement also.
Dan F.
★★★★★VerifiedMar 1, 2025
Product arrived quick and safe very happy
Reese B.
★★★★★VerifiedOct 9, 2024
absolutely love this product! My plants are always happier when used.
Walter C.
★★★★★VerifiedAug 22, 2024
All of there buildasoil products are good
Jeri F.
★★★★★VerifiedMay 18, 2024
I'm completely satisfied with this product. It arrived quickly. The packaging is excellent and insures the powder stays dry. I spoke with Zack over the phone because I had questions and he was very good to answer everything. I feel that BuildASoil is a good company with great customer service.
Eric T.
★★★★★VerifiedMay 8, 2024
Work fantastic help fumigate the soil in the defense of fungus gnats great product
Eric C.
★★★★★VerifiedMay 8, 2024
Jeremy hooked me on this stuff when he was piling it up in the 10x10(go check out the youtube series). Lol I drop some on pre-topdress, then topdress, and then work some into the topdress as well. I do this pre-flower and there's not a gnat to be seen in the growroom. I've went a little hard before and the plants have pushed right through
Gurvindeep S.
★★★★★VerifiedMay 3, 2024
Excellent quality. Very good slow release fertilizer for plants, especially Dhalias. I use it as liquid fertilizer. 1 cup Mustard meal, 1 cup Peanut meal, 1/2 cup Neem meal, add to 2 gallons of water. Ferment it for 4 days. Stir it once a day. Add it to 50 gallons of water. Apply every 3 to 4 weeks.
Reply from BuildASoil
I love this review!! Thank you for the beautiful photos and recipe to go with
Steve
★★★★★Mar 6, 2024
Product looks of great quality I am anxious to see how it affects my grow.
Kellen H.
★★★★★VerifiedFeb 24, 2024
Killed all bugs but friend my plants. Visible good bacteria seen.
Jeremy B.
★★★★★VerifiedJan 11, 2024
Got my fungus gnat population down. Also brought some mycelium with it🤘🏼
Ricky W.
★★★★★VerifiedJan 7, 2024
Haven’t used any yet, waiting until outdoor growing season
Dennis M.
★★★★★VerifiedOct 25, 2023
Work pretty good getting rid of my small fly/gnat situation. Have two Earth boxes, pulled my last crop at the beginning of May this year and put the planters with covers still on out to the back porch. I kept them slightly watered just for all the life in the soil. I brought them in a couple weeks ago to get another indoor round and noticed the infestation. Nearly wiped them out in about a week and a half with a couple applications.
Dennis
★★★★★Oct 11, 2023
Haven't even used it yet but I already know. Best part is knowing as I've watched Jeremy use all these products.
Alec G.
★★★★★VerifiedSep 19, 2023
Love it for mitigating my fungus gnat issue
Andrés S.
★★★★★VerifiedSep 5, 2023
every time I use… the top of my soil explodes with microbial life
marc g.
★★★★★VerifiedAug 14, 2023
Much better than mustard seed meal cake I have found elsewhere
Kyle F.
★★★★★VerifiedMay 16, 2023
Great product for re-amending soil and getting rid of pests. 5/5 will buy again.
Brian B.
★★★★★VerifiedMay 15, 2023
This stuff was great and worked just as planned. Knocked those fungus bats out in no time!! Build a Soil knocked it out of the park on this product!
Jeremy
★★★★★VerifiedMay 15, 2023
I used this in combination with nematodes and one, the other or both worked to get rid of them. I also added it to my reammend with the cover crop and the cover had no issues growing when sown at the same time as mustard application
Bruno P.
★★★★★VerifiedApr 26, 2023
Strong enough to lower down the fungus gnats!!
Wayne L.
★★★★★VerifiedApr 12, 2023
Did the job put it on top of my cover crop I chopped up almost all gone into the soul
Indianapolis J.
★★★★★VerifiedMar 30, 2023
Works great. Knocks back the gnats. Pungent eye watering but enjoyable smell for a day or two. Go easy at first. More sensitive plants can throw a bit of a fit for a while.
Ron F.
★★★★★VerifiedMar 28, 2023
This has seem to have gotten rid of those pesky stinking gnats. I sprinkled a generous amount around all my plants plus all my wife’s house plants. Buildasoil prouducts have never let me down 100% satisfaction.
Gary
★★★★★Mar 27, 2023
Purchased primarily for fungus gnat issues. Noticeable decrease a few days after application.
Mason M.
★★★★★VerifiedMar 25, 2023
Potent stuff! I had a fungus gnat population explosion during flower. I was hesitant to use so started slow with 2 tbsp per 10 gallon fabric pot. 90% of fungus gnats were eliminated after one top dress. I was able to control the rest with Dr. Zymes and yellow sticky traps. I will incorporate into each reammend moving forward.
Jeremy M.
★★★★★VerifiedMar 25, 2023
It really works great for battling the fungus gnats just use some caution as finicky plants can get leaf burn as well as young clones and seedlings. Plus it really does something to get the soil going.
Ron W.
★★★★★VerifiedMar 13, 2023
Will be applying to my garden this year. Transaction was great from start to finish with plenty of updates from the company. Thank you! Ron
Snoop D.
★★★★★VerifiedMar 4, 2023
I had a some fungus gnats show up when I was starting my new 20 gallons. I chopped the cover crop and covered the pot. The next day I uncovered the pots and liberally spread some Mustard Seeds across the top and wet the soil to activate the mustard seeds. Two days later, worked great! Gnats are gone and a wonderful sea of Mycelium across the top of the beds... Great stuff to have in your tool box! Snoop
William S.
★★★★★VerifiedFeb 4, 2023
I bought this to combat a fungus gnat problem and it worked really well. I’m sure it has lots of other benefits and I look forward to learning what they are.
Zach D.
★★★★★VerifiedFeb 2, 2023
This stuff blooms like NONE OTHER. Bio fumigates the soil if you have any underlying issue, provides nutrition AND explodes microbe population. What more could you want for in between runs?
JKret
★★★★★VerifiedJan 31, 2023
Had a pot with some pepper plants in and noticed a pretty significant gnat population living in the mulch layer. Probably spread about a full cup in this 5 gallon and I no longer have a gnat problem. No negative reaction from peppers.
Terry W.
★★★★★VerifiedJan 29, 2023
Just getting ready to plant my 2nd grow in 50 years My first is about a week away from harvest it’s Indica strain is High Society planted June29th It’s not an auto in earth box’s same for my auto flower Indica Gorilla Glue so I haven’t used the product’s yet the first grow was with Miracle Grow plus some toppings. I will let you know when I plant My auto’s
William
★★★★★Jan 28, 2023
Great product, great company. I used it knock down a fungus gnat problem. It worked really well.
Richard D.
★★★★★VerifiedJan 27, 2023
Works great for deterring pests and gettin the fungi jumpin!!!!
TonyBoy
★★★★★VerifiedJan 14, 2023
So far this stuff has done exactly what I bought it for, ...... Get Rid of these frigging knats. Just a couple TBLSPN and you're good to go. Great Organic product!!
Tung D.
★★★★★VerifiedJan 13, 2023
Package is solid. I used it in my garden for preventing damage by insect and feeding fertilizer to vegi and flowers. Finally, I am looking forward the results. maybe next season... :) Product looks good.
Joshua
★★★★★Jan 7, 2023
Because it's the best I have found on the market by far I highly recommend if you use organics this is a must have
Ryan
★★★★★Dec 31, 2022
Great product and shipping. Love Build a soil products
Vijay P.
★★★★★VerifiedDec 28, 2022
Used about a cup per 15 gallons then watered it in left my soul there for two weeks and everything was good. It didn’t knock all my gnat population but it reduced at least 90% of it.
Cory B.
★★★★★VerifiedDec 28, 2022
This is the perfect addition to my beds. What an incredible amount of growth. It mycelliated and bloomed trichoderma and others in the first few days and then really took off
Eric W.
★★★★★VerifiedDec 23, 2022
It doing the trick for the fungus gnats!!!
Marty S.
★★★★★VerifiedDec 8, 2022
It worked just as its supposed to. I used it to fumigate my re-amended 20 gallon pot. No more flying critters.
Ryan W.
★★★★★VerifiedDec 7, 2022
I like reusing soil and have it on a rotation. I dump and re-ammend and that soil sits for the next run. I have had gnats getting into that soil and with one application of the mustard sprinkled on top. I haven't seen any gnats! And the mycelium growth is insane!
Casey C.
★★★★★VerifiedNov 30, 2022
Works great for plants and pest control as well
Eric/ Zasso Chamberland / O.
★★★★★VerifiedNov 27, 2022
Well I had a little out break of nats and I went light couple times a week and it didn’t hurt the plants problem solved
Brandon M.
★★★★★VerifiedNov 22, 2022
Great so far, used to top dress house plants and earthbox along with craft blend.
Ky
★★★★★Nov 16, 2022
Does smell a bit but the myco movement is here