Need quick, reliable iron fixes that won’t burn foliage or stain hardscapes. Use liquid iron or chelates for fast foliar greening, granular ferrous sulfate for rapid root-available iron and pH lowering, and soil acidifiers for longer-term correction.
Match product choice to soil pH, plant type (acid lovers like hydrangeas versus turf), and application method. Follow label rates and timing for safe, steady results and improved plant color.
| Earth Science Iron Pro Fast-Acting Lawn & Garden Supplement |
| Fast-Acting Pick | Form: Granules | Primary Use: Lawns & garden iron supplement | Target Plants: Lawns, flowers, vegetables, shrubs, trees | VIEW LATEST PRICE | Read Our Analysis |
| LawnStar Liquid Iron 32 oz for Plants |
| Best For Tough Soils | Form: Liquid | Primary Use: Correct iron deficiency / plant growth (foliar or root) | Target Plants: Lawns, flowers, ornamentals, shrubs, trees, gardens | VIEW LATEST PRICE | Read Our Analysis |
| Ferrous Sulfate Heptahydrate Plant Fertilizer (1 lb) |
| Soil Acidifier | Form: Granules / water-soluble powder | Primary Use: Correct chlorosis / soil conditioner | Target Plants: Lawns, shrubs, trees, garden plants | VIEW LATEST PRICE | Read Our Analysis |
| Ferrous Sulfate Iron Powder for Plants (1 lb) |
| High-Purity Option | Form: Powder (water-soluble) | Primary Use: Correct chlorosis / provide iron | Target Plants: Garden, containers, trees, shrubs, houseplants (incl. acid-loving) | VIEW LATEST PRICE | Read Our Analysis |
| Hi-Yield (34340) Iron Sulfate (3.25 lbs.) |
| Heavy-Duty Coverage | Form: Granules | Primary Use: Prevent/correct chlorosis for lawns & plants | Target Plants: Lawns, shrubs, flowers, gardens | VIEW LATEST PRICE | Read Our Analysis |
| Earth Science IronPro Fast-Acting Lawn & Garden Iron Supplement |
| Quick Lawn Rescue | Form: Granules | Primary Use: Fast-acting lawn & garden iron supplement | Target Plants: Lawns, gardens, flowers, vegetables, shrubs | VIEW LATEST PRICE | Read Our Analysis |
| USEDDIG Ferrous Sulfate Heptahydrate Fertilizer (1 lb) |
| Resealable Convenience | Form: Water-soluble powder | Primary Use: Correct iron deficiency / greening foliage | Target Plants: Vegetables, flowers, houseplants, acid-loving species | VIEW LATEST PRICE | Read Our Analysis |
| Premium 8-4-8 Acidic Hydrangea Fertilizer (8 oz) |
| Acid-Loving Specialist | Form: Granules / slow-release (8 oz fertilizer) | Primary Use: Feed acid-loving flowering shrubs (hydrangea etc.) | Target Plants: Hydrangeas, azaleas, camellias, rhododendrons, gardenias (acid-loving) | VIEW LATEST PRICE | Read Our Analysis |
| Monterey LG7115 Soil Acidifier Granules (7 lb) |
| Organic-Friendly Choice | Form: Granules | Primary Use: Correct iron deficiency / soil acidifier for turf & ornamentals | Target Plants: Turf, flowers, vegetables, groundcovers, shrubs | VIEW LATEST PRICE | Read Our Analysis |
| Ferrous Sulfate Iron Supplement for Plants (8 oz) |
| Rapid Relief | Form: Powder (water-soluble) | Primary Use: Correct chlorosis / iron supplement for plants | Target Plants: Container plants, landscape plants, acid-loving species | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Earth Science Iron Pro Fast-Acting Lawn & Garden Supplement
Provided you want a quick, reliable way to bring out rich green in your lawn and garden without making grass grow out of control, Earth Science Iron Pro is a smart pick. You’ll like how the granules work fast on lawns, flowers, vegetables, shrubs, and trees. It gives twice the iron of leading brands and uses a patent-pending chelation process that enhances iron uptake up to 65 percent. You can spread it with any spreader, and it won’t stain or burn, so pets and kids stay safe. Apply as directed every 30 to 60 days for healthier soil and lively color.
- Form:Granules
- Primary Use:Lawns & garden iron supplement
- Target Plants:Lawns, flowers, vegetables, shrubs, trees
- Contains Iron:High iron content (proprietary iron supplement; 2× competitor)
- pH / Soil Acidifying Action (ability or claim to affect soil pH):Implied improvement of soil quality (supports uptake) — effective on all soil types
- Application Frequency / Directions:Lawns: 3 lb/1,000 sq ft every 30–60 days; plants: 1/3 lb/100 sq ft every 30–60 days
- Additional Feature:2× more iron
- Additional Feature:Patent-pending chelation
- Additional Feature:Non-staining / non-burning
LawnStar Liquid Iron 32 oz for Plants
Should you want quick, reliable correction for yellowing leaves and weak roots, LawnStar Liquid Iron 32 oz is a great pick for busy gardeners and homeowners who want visible results without fuss. You’ll like that this American made, EDTA-free formula works in alkaline soils up to pH 9.5, so it reaches plants where other irons fail. Use it for lawns, flowers, shrubs, trees, and garden beds via foliar spray or root drench. It enhances chlorophyll, repairs iron chlorosis, and supports steady root growth. The 32 ounce liquid is easy to measure, store, and apply whenever you need fast fixes.
- Form:Liquid
- Primary Use:Correct iron deficiency / plant growth (foliar or root)
- Target Plants:Lawns, flowers, ornamentals, shrubs, trees, gardens
- Contains Iron:Liquid chelated iron (sugar-based)
- pH / Soil Acidifying Action (ability or claim to affect soil pH):Stable in alkaline soils (works up to pH 9.5) — chelated iron (does not acidify)
- Application Frequency / Directions:Regular maintenance or corrective use; foliar spray or root drench as needed (no specific interval listed)
- Additional Feature:EDTA-free formula
- Additional Feature:Stable to pH 9.5
- Additional Feature:Foliar or root-drench
Ferrous Sulfate Heptahydrate Plant Fertilizer (1 lb)
In case you’ve got pale, yellowing leaves or a lawn that won’t stay green on alkaline soil, this ferrous sulfate heptahydrate 1 pound bag is the right choice for you because it both lowers soil pH and gives plants a quick lift of soluble iron. You’ll get granules with 20% iron and 12% sulfur that dissolve easily, so nutrient uptake improves and chlorosis fades. Mix one part product to 500 parts clean water, fully dissolve, then water at the roots every 30 days in cool morning hours. Wear gloves, avoid inhaling dust, and keep it away from skin and eyes.
- Form:Granules / water-soluble powder
- Primary Use:Correct chlorosis / soil conditioner
- Target Plants:Lawns, shrubs, trees, garden plants
- Contains Iron:Ferrous sulfate heptahydrate (20% Fe)
- pH / Soil Acidifying Action (ability or claim to affect soil pH):Lowers pH of alkaline soils (acidifies)
- Application Frequency / Directions:Dilute 1:500 for root watering; apply approximately every 30 days
- Additional Feature:20% iron content
- Additional Feature:Lowers alkaline pH
- Additional Feature:1:500 dilution ratio
Ferrous Sulfate Iron Powder for Plants (1 lb)
Should you want fast, reliable green for iron-hungry plants, this 1 pound ferrous sulfate powder is a smart choice that works for gardeners and houseplant lovers alike. You’ll find XIXISUSU Ferrous Sulfate easy to mix because it dissolves quickly in water, so you can treat yellowing leaves right away. It gives highly available iron that plants absorb fast, helping hydrangeas, gardenias, snake plants, shrubs, trees, and containers regain vigor. The concentrated, high purity formula fits garden and grounds use, and you’ll like the small 2 across 2 inch package for neat storage. Follow directions and you’ll see greener growth.
- Form:Powder (water-soluble)
- Primary Use:Correct chlorosis / provide iron
- Target Plants:Garden, containers, trees, shrubs, houseplants (incl. acid-loving)
- Contains Iron:Ferrous sulfate (iron sulfate powder)
- pH / Soil Acidifying Action (ability or claim to affect soil pH):Supports soil health; used for acid-loving plants (can acidify when used)
- Application Frequency / Directions:Mix with water for application; follow directions for frequency (fast-acting; use as directed)
- Additional Feature:High-purity powder
- Additional Feature:Water-soluble concentrate
- Additional Feature:Fast bioavailability
Hi-Yield (34340) Iron Sulfate (3.25 lbs.)
Assuming you want fast help for yellowing lawns and shrubs, Hi-Yield Iron Sulfate (model 34340) is a great choice for gardeners who need a simple, reliable fix. You’ll find 3.25 pounds of granular iron sulfate that treats up to 1,000 square feet, so you can tackle larger patches without fuss. Apply in the cooler morning and follow label directions for different plants. The small package fits easily in your shed and the granules spread evenly. You’ll get clear instructions and a manufacturer warranty in case you require assistance. This product helps correct chlorosis and enhances plant vigor quickly.
- Form:Granules
- Primary Use:Prevent/correct chlorosis for lawns & plants
- Target Plants:Lawns, shrubs, flowers, gardens
- Contains Iron:Iron sulfate (iron source for chlorosis correction)
- pH / Soil Acidifying Action (ability or claim to affect soil pH):Used to prevent/correct chlorosis (typically acidifying iron sulfate)
- Application Frequency / Directions:Apply in cool morning; consult label for application rates and timing (treatment varies by plant)
- Additional Feature:Treats ~1,000 sq ft
- Additional Feature:Morning application advised
- Additional Feature:Granule form
Earth Science IronPro Fast-Acting Lawn & Garden Iron Supplement
You’ll love Earth Science IronPro whenever you want quick, visible results without fuss or worry; this fast-acting iron supplement gives tired lawns, gardens, and shrubs a deep green lift in days whilst staying gentle on people, pets, and plants. You’ll apply it with a spreader and cover up to 1,600 sq ft, so larger yards stay easy to care for. It promotes strong root growth whilst avoiding burns and stains, and it fits into eco-friendly gardening routines. Because Earth Science brings over 25 years of experience, you’ll feel confident using a sustainable product that supports healthy soil and plants.
- Form:Granules
- Primary Use:Fast-acting lawn & garden iron supplement
- Target Plants:Lawns, gardens, flowers, vegetables, shrubs
- Contains Iron:Fast-acting iron supplement (IronPro)
- pH / Soil Acidifying Action (ability or claim to affect soil pH):Supports healthy soil (eco-friendly formula) — promotes uptake
- Application Frequency / Directions:Easy spreader application; covers up to 1,600 sq ft per application (repeat as needed)
- Additional Feature:Covers 1,600 sq ft
- Additional Feature:Eco-friendly formula
- Additional Feature:Backed 25+ years
USEDDIG Ferrous Sulfate Heptahydrate Fertilizer (1 lb)
Provided that you want a simple, reliable way to green up pale leaves and help acid-loving plants thrive, the USEDDIG Ferrous Sulfate Heptahydrate (1 lb) is a great choice. You’ll find a resealable bag of water soluble powder that’s easy to store and measure. It delivers 20% iron and 12% sulfur to correct yellowing veins and enhance chlorophyll so leaves look healthier. Use 1 g per liter of water and apply every 20 to 30 days for maintenance, or every 7 to 15 days for severe deficiency. It works indoors and outdoors on vegetables, flowers, houseplants and acid lovers like ferns.
- Form:Water-soluble powder
- Primary Use:Correct iron deficiency / greening foliage
- Target Plants:Vegetables, flowers, houseplants, acid-loving species
- Contains Iron:Ferrous sulfate heptahydrate (20% Fe)
- pH / Soil Acidifying Action (ability or claim to affect soil pH):Lowers pH / suitable for acid-loving plants
- Application Frequency / Directions:Dilution 1 g per 1,000 ml; routine every 20–30 days, severe cases every 7–15 days
- Additional Feature:Resealable bag
- Additional Feature:100% water-soluble
- Additional Feature:Routine / severe schedules
Premium 8-4-8 Acidic Hydrangea Fertilizer (8 oz)
At the point you want fuller blooms and healthier roots for hydrangeas and other acid-loving plants, this Premium 8-4-8 Acidic Hydrangea Fertilizer is a smart pick. You’ll appreciate the balanced 8-4-8 mix with iron and sulfur that gently lowers pH and feeds plants. It uses sulfur-coated urea and ammonium sulfate for slow release up to three months, so roots get steady nutrition. You can use it in pots, beds, or grounds in any climate. Apply around the base and water in. Wear gloves and a mask, keep away from pets and food, and store dry for best results.
- Form:Granules / slow-release (8 oz fertilizer)
- Primary Use:Feed acid-loving flowering shrubs (hydrangea etc.)
- Target Plants:Hydrangeas, azaleas, camellias, rhododendrons, gardenias (acid-loving)
- Contains Iron:Includes iron (with N-P-K 8-4-8 plus iron)
- pH / Soil Acidifying Action (ability or claim to affect soil pH):Specifically acidic fertilizer (formulation boosts soil acidity)
- Application Frequency / Directions:Apply around plant base and water; slow-release feeds up to 3 months
- Additional Feature:Slow-release up to 3 months
- Additional Feature:Sulfur-coated urea
- Additional Feature:For acid-loving blooms
Monterey LG7115 Soil Acidifier Granules (7 lb)
Should your plants are turning pale or their leaves are yellowing, Monterey LG7115 Soil Acidifier Granules can be the practical fix that gets them green again. You’ll like that it mixes iron and sulfur so plants absorb nutrients more easily and the soil becomes more acidic. It contains 22% iron and 55% sulfur, with iron in oxide form that won’t stain until soil moisture converts it. You can use it on turf, flowers, vegetables, shrubs and groundcovers. It’s OMRI listed for organic gardens and feels gentler than some products because it’s labeled non burning. Reviews average 4.4 of 5.
- Form:Granules
- Primary Use:Correct iron deficiency / soil acidifier for turf & ornamentals
- Target Plants:Turf, flowers, vegetables, groundcovers, shrubs
- Contains Iron:Iron (22% listed; oxide form in product)
- pH / Soil Acidifying Action (ability or claim to affect soil pH):Reduces soil pH (acidifier; iron + elemental sulfur)
- Application Frequency / Directions:Follow product instructions for turf and ornamentals (used to correct yellowing; application guidance provided)
- Additional Feature:22% iron / 55% sulfur
- Additional Feature:OMRI listed (organic)
- Additional Feature:Non-burning claim
Ferrous Sulfate Iron Supplement for Plants (8 oz)
Provided you want a quick fix for yellowing leaves, this ferrous sulfate iron supplement is a great choice for gardeners who need fast, visible results. You’ll find high-purity ferrous sulfate powder that dissolves easily, so you can mix it with water and feed plants without fuss. It targets chlorosis, bringing back lively green color and fuller foliage for houseplants, containers, shrubs, lawns, and acid lovers like hydrangeas. You’ll notice improved growth and healthier soil once you follow directions. Labels include Spanish names sulfato de hierro para plantas and sulfato ferroso para plantas, making it easy to match the product you need.
- Form:Powder (water-soluble)
- Primary Use:Correct chlorosis / iron supplement for plants
- Target Plants:Container plants, landscape plants, acid-loving species
- Contains Iron:Ferrous sulfate (high-purity iron)
- pH / Soil Acidifying Action (ability or claim to affect soil pH):Used to correct chlorosis and support soil health (acidifying ferrous sulfate)
- Application Frequency / Directions:Mix with water; apply according to directions for containers and landscape (frequency per label)
- Additional Feature:High-purity powder
- Additional Feature:Rapid-acting soluble
- Additional Feature:Container- and landscape-safe
Factors to Consider When Choosing Iron Sulfate Garden Fertilizers
Whenever you’re picking an iron sulfate fertilizer, start across checking your soil pH because iron only helps plants whenever the soil allows it to be available. You’ll also want to compare formulation types and application methods to find something that fits your watering routine and the plants you care about. Keep an eye on recommended rates and how often to apply so you don’t stress your garden and can match the product to your plant compatibility range.
Soil pH Levels
Should your plants are yellowing and you suspect iron deficiency, checking soil pH is the smart initial step because iron sulfate works best in acidic to neutral soil and loses punch as the ground turns alkaline. Start by testing pH so you know whether iron sulfate will dissolve and feed roots. If pH reads high, iron sulfate can help because the sulfate lowers pH around roots as it oxidizes. Keep in mind heavier soils with lots of clay or organic matter resist change, so you might need larger or repeated applications. Sandy soils shift faster and need less. After you apply, wait several weeks to months and retest pH to track changes and avoid over-acidifying. This careful approach protects plants and helps iron treatments actually work.
Iron Formulation Type
Pick the right iron type and you’ll save time, money, and a lot of worry about yellowing leaves. You’ll choose between quick fixes and slow care. Ferrous sulfate works fast, gives about 20% iron, adds sulfur, and helps provided your soil leans alkaline. Chelated iron stays available in higher pH and cuts waste through keeping iron soluble. Liquids, chelated or sugar based, deliver iron quickly to leaves or roots whenever you need fast greening. Elemental iron and iron oxides act slowly, releasing iron as they rust in soil, so they lower risk of leaf burn or stains and last longer. Match formulation to how urgent greening is, your soil pH, and whether you want a fast fix or lasting care.
Application Methods Available
You’ve picked the right iron type, now consider about how you’ll apply it so your plants actually get the benefit. You can spread granular iron sulfate across turf or use spot applications near roots. Water it in so the granules move into the soil and reach the feeder roots. Should you want faster correction, dissolve ferrous sulfate powder for a root drench using a mild dilution and pour it around the base. Liquid and soluble sulfate sprays work as foliar applications for quick green up, though you’ll repeat them periodically. For shrubs or single trees, place granules or rings at the drip line to target roots and cut waste. In alkaline soils, combine irrigation and acidifying measures to improve iron availability and uptake.
Rate And Frequency
At the point you decide how often to apply iron sulfate, regard it like giving a plant just the right amount of attention so it can recover without being stressed. You’ll likely treat most plants about once every 30 days in the growing season. Should deficiency be bad, you might need treatments every 7 to 15 days until leaves green up. For root drenching, use about 1 gram per liter or a 1:500 dilution for maintenance and reserve stronger mixes for corrections. Turf uses several pounds per 1,000 sq ft and repeats every 30 to 60 days as required. Cut back during dormancy, heavy rain, or heat to avoid leaching. Watch leaf color and soil pH. Once things improve, lengthen intervals to prevent buildup or excess acidity.
Plant Compatibility Range
Now that you’ve learned how often to feed plants with iron sulfate, it helps to look at which plants actually need it and how their needs differ. You’ll find iron sulfate works best for acid loving plants like hydrangeas, azaleas, camellias, and gardenias because it supplies iron and gently lowers soil pH. In lawns, shrubs, and trees you can use it whenever you see chlorosis, but you’ll adjust rates per species to avoid damage. For container and houseplants, use much lower concentrations and apply less often since pots can’t buffer changes. Should your soil be alkaline, iron sulfate can free up iron. Be cautious with seedlings, young transplants, and salt sensitive species and start with conservative doses while you observe plant response.
Safety For People/Pets
Because iron sulfate can sting skin and eyes and harm curious pets or kids, handle it with care and respect so your garden stays safe and welcoming. Whenever you open bags or spread granules, wear gloves, eye protection, and a dust mask because the powder can irritate skin, eyes, and lungs. Store products locked away and clean up spills right away so no one sniffs or tastes them. Don’t put iron sulfate on edible plant parts or where you harvest food unless the label says it’s safe and gives wait times. After you apply it, wash hands and any exposed skin before eating or touching pets, and keep treated areas dry until the product is watered in or settled per instructions. Should anyone swallow it, get medical or veterinary help immediately.
Environmental Impact Considerations
You’ve already taken steps to protect people and pets around iron sulfate, and keeping the environment safe uses many of the same careful habits. Whenever you use iron sulfate, watch soil pH because sulfate can form acid and slowly lower pH. That change can stress acid-sensitive plants and harm soil life. Also consider where water goes. In sandy or overwatered soils, soluble iron can leach toward groundwater and change local water chemistry. You should avoid heavy or frequent applications since excess sulfate and low pH can shift microbial communities and reduce biodiversity. Store and handle concentrates carefully to prevent spills that cause local acid damage. Because iron sulfate breaks down faster than many chelates, you can manage impact with proper dosage, timing, and attention to runoff.
Coverage And Packaging
Should you choose iron sulfate, consider about how much ground a package will actually cover so you won’t wind up with extras cluttering the garage. Check the net weight and unit count on the label so you can figure area treated. Look for stated coverage per package or per pound, often shown as square feet treated, and compare that to your lawn or beds. Powders and granules usually list coverage per pound, while liquids show treatment volume per ounce, so read both formats closely. Reflect on resealable bags versus bulky containers in case you won’t use it all at once. For repeat use, multiply the recommended rate by your site area to estimate annual needs and pick the most cost and size effective packaging.