Grower's Ally

Growers Ally Fungicide Spray for Plants - Ready-to-Use Indoor Outdoor Plant Fungicide Treatment for Powdery Mildew Alternaria Blight

1036+ bought in the past month

$16.91

About this item

  • MAXIMIZE YIELDS – This outdoor and indoor plant fungicide kills and prevents common plant pathogens, including powdery mildew, alternaria blight root rot, crown rot, and stem rot. When unavailable, use Earth’s Ally Disease Control, which provides the same proven fungicide protection.
  • ZERO POLLUTANTS – Formulated with food-grade citric-acid, our formula is FIFRA 25(b) exempt and OMRI Listed for use in organic gardening. This garden safe spray tests clean and contains no residual solvents, no synthetic pesticides and no heavy metals.
  • KILLS AND PREVENTS POWDERY MILDEW – Our broad-spectrum citric acid fungicide is an effective natural disinfectant. It reduces bacterial growth yet is gentle on plant tissue. When this mildew plant spray is used preventatively, citric acid forms a protective barrier on the surface of the leaves to inhibit pathogen development.
  • HARVEST SAME DAY – The residue-free fungicide spray can be safely applied through all stages of plant growth, from clones through the flowering cycle when many problems occur.
  • RECOMMENDED BY CULTIVATORS – Used across indoor, outdoor, greenhouse, and hydroponic grow spaces. An eco-minded formula that’s bee-safe and suitable for homes with kids and pets.
$16.91

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Product details

Item FormLiquid
Item Weight0.29 Pounds
Liquid Volume24 Fluid Ounces
Active IngredientsCitric Acid
BrandGrower's Ally

Technical specifications

item_formLiquid
item_weight4.7 ounces
liquid_volume24 Fluid Ounces
active_ingredientsCitric Acid
brandGrower's Ally
target_speciesPlant pathogens
upc810021610023
package_dimensions10.91 x 4.65 x 2.17 inches
manufacturerSarasota Green Group
item_model_numberGA-FUNGICIDE-Prnt
date_first_availableMay 14, 2020
best_sellers_rank#5,448 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #635 in Pest Control Products

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Customer reviews

4.33,519 ratings

Customers say

Customers find the fungicide effective against powdery mildew and appreciate its safety as a non-toxic, easy-to-use product with a pleasant smell.

★★★★★

Good for powdery mildew

CorrieOctober 4, 2025✓ Verified purchase

I live in the southeast U.S. where it's very humid most of the year, and powdery mildew is a constant battle. I'd tried milder DIY options (baking soda solutions) and that worked ok on some plants (like my bee balm, which the mildew seems to love) but wasn't as effective on my succulents (and not the most convenient to use, e.g. spray nozzles clogging after awhile). Decided to give this a try, and it has worked great at controlling powdery mildew on both outdoor & indoor plants. Even a single treatment (I always forget whatever short-term repeat it recommends in the directions) clears up most mildew. Some reviewers have commented about leaves falling off after using this on plants with powdery mildew-- but yeah, sounds like that's from the fungus. You're not going to restore leaf damage from powdery mildew, the goal is to prevent further damage/avoid it damaging so much foliage that it significantly harms the plant. My bee balm has had no leaf-loss issues with this. Likewise, my succulents will usually have a brown scar where the fungus was but keep those leaves (it'd make sense for a plant to drop leaves if you treated them with a pretty intense or widespread infection, as they'd no longer be much use to the plant). I also lightly spray my uninfected succulents, prophylactically (at the same dilution), and they've not suffered any ill effects from the fungicide. One caveat, I feel like a fungicide perhaps shouldn't... grow a bunch of mold? (Happened in both the spray bottle and the slightly larger bottle that I use to make the dilution, a week or two after mixing it up; both bottles had been closed in the meantime.) It may be that the fungicide is just targeted to fungi likely to affect plants rather than being a "nuke it all" approach (which would actually be a good thing IMO) or just balancing strength vs. safety for plants (and humans, other stuff in environment, etc.). Not taking off any stars as it still works well as applied to my plants right after diluting-- I'll just mix up smaller volumes at a time from now on, fresh each time I need to use it. Read more

Review image 1
★★★★★

Product works well

Jeffrey TottenFebruary 23, 2026✓ Verified purchase

Good product, arrived very quick, would buy again. Read more

★★★★☆

Somewhat effective

BflashJuly 11, 2025✓ Verified purchase

Minimally effective on my cukes and zucchini. But with our rains in TX I don’t think this product is totally to blame. Read more

★★★★★

Good product.

gil67?farmFebruary 7, 2026✓ Verified purchase

Seems to be helping my plant. Item came quickly but leaked some in shipping. Read more

★★★☆☆

Gentle and effective if…..

Shiloh TimberlandAugust 21, 2024✓ Verified purchase

Let me begin by saying that I purchased this product to combat powdery mildew on my pumpkins and zucchini. Some leaves were Affected more severely than others so it was a great chance to try out this product wide variety of severity. I have a fairly large garden and use the whole bottle and where I found it most effective was leaves where the mildew was beginning to start (mild cases). Within four hours, it was cleared up mostly cleared up. There’s still remnants of the mildew spotting, but I do believe the product worked effectively. According to the directions, for more severely affected leaves, second Application was required. For those leaves, I did not notice a difference even after the second application. I would recommend having this product on hand early in the season so you can mitigate mildew right away. If you’re looking for something to correct a more severe issue, this is not your product. Read more

★★★★★

Dang...it really works

HoffMarch 10, 2023✓ Verified purchase

First time grower, I went all out with the bells and whistles. Tent, controllers, multiple fans, high end light setup etc. Though most of vegetation was completely fine, towards the end I ran into issues with powdery mildew showing up. After a LOT of research, it was a demon of my own making. Plants too close together, too many for the space, too high humidity, not enough airflow, I basically did all the wrong stuff. After discovering some SMALL spots on my leaves I panicked, researched, and resolved the environmental issues. It's now at proper humidity and temperature with adequate airflow and a carbon filter. Since doing that alone won't kill mildew, I started looking into options to "stop the spread". I tried the home remedies with neem oil, dish soap, milk, it just seemed to come right back. I decided to look for something a bit more focused for my issue and came across this organic solution. It works extremely well. If you follow the directions, it is very self explanatory. It's great as a preventative too, even if you don't have the powdery mildew issue currently. I bought the handheld spray version first as a tester, great way to lead into it. It worked so well I got the concentrate to use continuously, I use the original spray bottle and refill it. It works out to 1.8tsp of concentrate to refill that original spray bottle, so it will last a really REALLY long time for the home user at that rate. Overall, it will now be part of my standard arsenal for indoor growing. When i started seeing powdery mildew, my tent was at 80 degrees with 50-65% humidity when I started noticing issues, though it was that way due to multiple variables that have been resolved. Keep in mind, this product works great but is not a super cure. You MUST resolve environmental issues to keep it from coming right back, this just kills it on the spot Read more

★★★★★

Works

AkFebruary 26, 2026✓ Verified purchase

It's works! Read more

★★★★★

Works !

Lynn davisFebruary 27, 2026✓ Verified purchase

Wow it works !!! Some of my perennials had powder mildew so I ordered this , two different applications to the plants and soil and like magic its gone ! Highly recommend this product . Read more

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