10 Best Best Fungicide For Hollyhock Rust of 2025

Tested and Reviewed: Top 10 Best Fungicide For Hollyhock Rust deals with expert ratings from 8.1 to a perfect 10

May 2026 Edition

Editor's Choice

9.7

Save 29%

ARBER

Organic Fungicide for Plants – Liquid Concentrate for Indoor & Outdoor Use; Treats Powdery Mildew, Leaf Spot, Root Rot & Lawn Diseases; Mushroom & Rust Control; Safe Around Kids, Pets & Pollinators

29% Off

Editor's bottom line:

“This best fungicide for hollyhock rust is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Stop disease from stealing your bloomsthis organic fungicide knocks back powdery mildew, leaf spot, root rot and lawn fungi fast, helping leaves green up and buds bounce back. Spray after humid days, before gatherings, and during peak growth.
Powered by certified-organic biologicals and plant-derived actives that create a protective barrier on leaves and roots, supporting soil microbiome balance for lasting resilience. Gentle on foliage; no harsh residues or synthetic chemicals.
Versatile concentrate for houseplants, trees, roses, veggies, shrubs and lawnsideal in greenhouses, raised beds, balconies and yards. Dilutes easily for repeat treatments; use after mowing, on long rainy weeks, and when new growth appears.
Family- and pollinator-conscious formulasafe around kids, pets and beneficial insects when used as directed. Low-odor, indoor-friendly, and garden safe for organic gardening routines. Keep peace of mind while you protect every corner of your garden.
Easy mix-and-spray routine fits busy days: measure, dilute, and coat leavesbefore sunrise watering, after travel, or ahead of weekend parties. Shelf life up to 3 years so youre always stocked to grow confidently, season after season.

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Picked by 397 people today

9.5

Save 13%

Bonide

Bonide Captain Jack's Copper Fungicide, 32 oz Ready-to-Use Spray for Organic Gardening, Controls Common Diseases

13% Off

Main Highlights

Control fungus and disease in your garden with Captain Jacks ready-to-use Liquid Copper Fungicide!
Approved for organic gardening, this fungicide is suitable for the production of organic produce and can even be used up until the day of harvest!
Copper Fungicide effective in the control and prevention of a wide range of plant diseases. Listed common garden diseases include blight, black spot, powdery mildew peach leaf curl and more.
Apply copper fungicide to fruits, vegetables, ornamentals and other plants in your lawn and garden for complete and long-lasting disease control.
This product arrives conveniently ready-to-use in a trigger spray bottle! To use, shake well and thoroughly apply to affected plants and foliage. Please see product label for full use instructions.

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9.5

Garden Safe

Garden Safe Fungicide 3 32 Oz. Ready to Use Trigger Spray Fungicide - 1 Each

Main Highlights

FOR ORGANIC GARDENING: Use in & around the home & home garden on roses, flowers, houseplants, ornamental trees & shrubs, fruits & vegetables
FUNGICIDE: For prevention and control of various fungal diseases including black spot, rust and powdery mildew
3 GARDEN PRODUCTS IN 1: Fungicide, insecticide & miticide product kills eggs, larvae and adult stages of listed insects and prevents fungal attack of plant tissues
CONTAINS NEEM OIL EXTRACT: The active ingredient is clarified hydrophobic extract of neem oil
INSECTICIDE & MITICIDE: Controls aphids, whiteflies and other listed insect pests (insecticide). Also controls spider mites (miticide)

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9.2

Natria

NATRIA Disease & Fungus Control, Ready-to-Use, 24 oz, Liquid Copper Fungicide, Copper Fungicide Spray for Plants

Main Highlights

CONTROLS POWDERY MILDEW & OTHER DISEASES: Protects buds and flowers from powdery mildew, rust, black spot, fruit rot, downy mildew, late blight and other listed diseases
CAN BE USED UP TO DAY OF HARVEST: Broad spectrum control of listed fungal and bacterial diseases on homes, home gardens and home greenhouses
FOR ORGANIC GARDENING: OMRI-Listed for hydroponic gardening

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9.0

Neudorff

Neudorff Plant Fungicide Spray, Copper Soap Fungicide for Roses, Fruits & Vegetables Control Powdery Mildew and Other Diseases and Fungus for Organic Gardening, Ready-to-Use (32 oz)

Main Highlights

Neudorff Copper Fungicide Controls Listed Plant Diseases: Powdery Mildew, Rusts, Black Spot, Leaf & Fruit Spot, Downy Mildew, Fruit Rot, Late Blight, Peach Leaf Curl and Other Listed Diseases.
Fungicide for Fruit Trees and Plants For Organic Gardening & Can Be Used up to Day of Harvest: For Roses, Vegetables, Fruits, Fruit Trees, Flowers, & Ornamentals and Use for Early and Late Blight on Tomatoes and Potatoes.
Houseplant Fungicide for Indoor Plants, Dormant and Growing Season Liquid Copper Fungicide Controls Listed Plant Diseases Using Low Concentration of Copper and Protects Buds and Flowers such as Rose.
For Organic Gardening; For Use in Homes, Home Gardens, and Home Greenhouse, This Ready-To-Use Copper Fungicide Spray for Plants Decomposes to Form Soluble Copper and Fatty Acid, Both of Which Can Be Used by Microbes and Plants.
How to Use: Begin Treatment for Plant Care 2 Weeks before Diseases Normally Appears or When Disease First Appears, and Repeat 7 - 10 Days Intervals for as Long as Needed. Reapply after Rain

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8.8

Save 10%

BioAdvanced

BioAdvanced All-In-One Rose and Flower Plant Care Spray - Insect Control, Disease Control & Plant Mite Killer - Ready-to-Use - Prevents Pests and Diseases - Up to 14 Days Protection - 24 fl oz Bottle

10% Off

Main Highlights

3-IN-1 FLOWER CARE: All-In-One Rose & Flower Plant Care provides insect control, disease control, and plant mite control all in one; Rainproof protection starts in 4 hours and lasts up to 14 days
INSECT KILLER: Pest control formula kills and prevents Aphids, adult Japanese Beetles, Whiteflies, and other listed pests; Use outdoors on rose bushes*, flower plants*, ground covers, vines, ornamentals, shrubs, and trees
DISEASE CONTROL: Fungicide controls Black Spot, Powdery Mildew, Rust, Scab, and other listed diseases; Convenient and ready-to-use spray *Apply when pollinators are not present
PLANT MITE CONTROL: Miticide kills and prevents spider mites and plant mites
GET MORE FROM THE BLUE BOTTLE: Explore BioAdvanced's science-based solutions for roses and flowers; We make it easier than ever to prevent diseases, kill and protect against insects, and feed plants for up to weeks at a time

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8.6

Grower's Ally

Grower's Ally Fungicide Spray for Plants - Ready-to-Use Indoor Outdoor Plant Fungicide Treatment for Powdery Mildew, Alternaria Blight, Rot, Fungus - OMRI Listed, Trusted by Cultivators - 24 Oz

Main Highlights

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 Earths 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 thats bee-safe and suitable for homes with kids and pets.

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8.3

Bonide

Bonide Captain Jack Copper Fungicide 16 oz Concentrated Plant Disease Control Solution for Organic Gardening

Main Highlights

Control fungus and disease in your garden with Captain Jacks Liquid Copper Fungicide Concentrate!
Approved for organic gardening, this fungicide is suitable for the production of organic produce and can even be used up until the day of harvest!
Copper Fungicide effective in the control and prevention of a wide range of plant diseases. Listed common garden diseases include blight, black spot, powdery mildew peach leaf curl and more.
Apply copper fungicide to fruits, vegetables, ornamentals and other plants in your lawn and garden for complete and long-lasting disease control.
This product arrives conveniently ready-to-mix! To use, mix with water according to package directions and thoroughly apply to affected plants. Please see product label for full use instructions.

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8.1

Garden Safe

Garden Safe Brand Fungicide3, 1 Gallon, Fungicide, Insecticide and Miticide with Neem Oil Extract for Organic Gardening, Controls Black Spot, Rust, Aphids and Spider Mites

Main Highlights

3 GARDEN PRODUCTS IN 1: Fungicide, insecticide & miticide product kills eggs, larvae and adult stages of listed insects and prevents fungal attack of plant tissues
FUNGICIDE: For prevention and control of various fungal diseases including black spot, rust and powdery mildew
CONTAINS NEEM OIL EXTRACT: The active ingredient is clarified hydrophobic extract of neem oil
INSECTICIDE & MITICIDE: Controls aphids, whiteflies and other listed insect pests (insecticide). Also controls spider mites (miticide)
FOR ORGANIC GARDENING: Use in & around the home & home garden on roses, flowers, houseplants, ornamental trees & shrubs, fruits & vegetables

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8.1

Save 24%

Spectracide

Spectracide Immunox Multi-Purpose Fungicide Spray Concentrate For Gardens 16 Ounces, Protects Up To 2 Weeks

24% Off

Main Highlights

FOR GARDENS: Multi-purpose formula cures and prevents all major diseases on roses, flowers and ornamental shrubs
RAINPROOF: Cant be washed off by rain once the spray is dry
USE ON: Protects fruits, nuts, vegetables, trees, lawns and ornamentals
CONCENTRATE: Choose a spray application method and mix with water as directed

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Our Best Overall Choice

Best Choice

9.7

ARBER

Organic Fungicide for Plants – Liquid Concentrate for Indoor & Outdoor Use; Treats Powdery Mildew, Leaf Spot, Root Rot & Lawn Diseases; Mushroom & Rust Control; Safe Around Kids, Pets & Pollinators

29% Off

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Stop disease from stealing your bloomsthis organic fungicide knocks back powdery mildew, leaf spot, root rot and lawn fungi fast, helping leaves green up and buds bounce back. Spray after humid days, before gatherings, and during peak growth.
Powered by certified-organic biologicals and plant-derived actives that create a protective barrier on leaves and roots, supporting soil microbiome balance for lasting resilience. Gentle on foliage; no harsh residues or synthetic chemicals.
Versatile concentrate for houseplants, trees, roses, veggies, shrubs and lawnsideal in greenhouses, raised beds, balconies and yards. Dilutes easily for repeat treatments; use after mowing, on long rainy weeks, and when new growth appears.
Family- and pollinator-conscious formulasafe around kids, pets and beneficial insects when used as directed. Low-odor, indoor-friendly, and garden safe for organic gardening routines. Keep peace of mind while you protect every corner of your garden.
Easy mix-and-spray routine fits busy days: measure, dilute, and coat leavesbefore sunrise watering, after travel, or ahead of weekend parties. Shelf life up to 3 years so youre always stocked to grow confidently, season after season.

Show Price

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