High quality product and fast shipping
Excellent value product and ready just in time for winter to help my grass keep looking green
Liquid Iron Lawn Fertiliser 7% Iron & 3% Sulphur, Fulvic Acid Chelated Tonic - 1L
Sulphur and fulvic acid for deeper green.
Plant Doctor Liquid Iron Fertiliser is a fast-acting liquid iron (7% Fe) and sulphur blend supercharged with fulvic acid. It quickly corrects iron deficiencies, boosts chlorophyll production and restores deep green colour in lawns, gardens and crops.
7% Fe + 3% S
Rapid Green-Up
Fixes Yellowing & Iron Deficiency
LawnsGardensFarms
$19.95
Description
Kickstart Greener Growth, Fast
Struggling with yellowing leaves or dull, patchy grass? Plant Doctor Liquid Iron Fertiliser is a powerful iron-rich solution enhanced with Fulvic Acid for rapid uptake and visible results. It revives pale, iron-deficient plants by boosting chlorophyll production, helping lawns and gardens bounce back with deep, lush colour. Whether you're rescuing a tired lawn or restoring vigour to fruit trees and ornamentals, this easy-to-apply liquid gets nutrients where they’re needed, fast.
Use Liquid Iron when your lawn or plants show yellowing with green veins, have lost their green shine, aren’t responding to fertiliser, or need a fast colour boost, especially after heavy lime use or in alkaline soils.
Greener overnight. Purchased A Small 1L bottle as a test for my footpath, sprayed it out and too my surprise the next morning it was noticeably greener. Took only 2 or so more day to get a lovely shade of green. 100% adding this to my arsenal for that lovely green during winter for my whole lawn.
Nutrient Profile:
Fe
Iron
7%
S
Sulphur
3%
Functional Additives: Fulvic acid (bio-chelating agent) – improves uptake efficiency and translocation and Liquid carrier designed for foliar + soil absorption.
Why choose Liquid Iron:
- Corrects yellowing (chlorosis) from iron deficiency
- Promotes rich, deep green colour in lawns and foliage
- Supports strong, healthy plant growth
- Fulvic acid speeds up nutrient absorption
- Compatible with most humic and soil-based fertilisers*
- Works via foliar spray or soil drench
- Suitable for turf, trees, vines, flowers, veggies & ornamentals
*Always do a quick “jar test” for compatibility before mixing. Compatible with most humic/fertiliser blends
Bring Back the Green, Fast. There’s no need to live with yellowing plants or dull, pale grass. Liquid Iron with Fulvic Acid delivers fast, visible results, greening up your landscape while giving plants the micronutrient support they need to thrive. Restore colour, strengthen growth, and keep your garden glowing, all in one simple, effective dose.
(LIR01L)
Features
Specifications
How it Works
The Science Behind Liquid Iron:
Iron is essential for chlorophyll formation — the green pigment that drives photosynthesis. But in many Australian soils, iron gets locked up due to high pH, compaction, or excessive lime.
This formulation contains:
- 7% Iron (Fe): A highly available form plants can absorb quickly
- 3% Sulphur (S): Helps acidify the soil slightly and aids iron uptake
- Fulvic Acid: A natural organic acid that chelates nutrients and speeds up delivery through leaves and roots
The result? Fast correction of iron chlorosis (yellowing), deeper green foliage, and improved photosynthetic function for overall healthier growth.
Application
IMPORTANT NOTE: Iron products can have an adverse reaction with our darker liquids. To avoid blockages in sprayer nozzles, we recommend applying the Iron separately from other products. (Stimulizer is safe to mix with Iron). If attempting to mix together, try a jar test in the ratios you want to apply them in first. Iron should always be added last, after all other products are diluted with water.
Applied separately at various frequencies allows you to tailor nutrient input based on the soil/plant/lawn's requirements and condition.
| Application Type | Rate: | Frequency |
|---|---|---|
| Minimum dilution rate: | 1:50 | |
| Turf: | 150-400ml/100sqm 1.5-4L/Ha |
Apply every 4 weeks in growing season or as required |
| Ornamental Plants: | 10-25ml/10litres water 100-250ml/100sqm |
Apply every 4 weeks in growing season or as required |
| Vegetables: | 150-300ml/100sqm 1.5-3L/Ha |
Apply fortnightly or as required |
| Trees, Fruits, Nuts & Grapevines: | 150-300ml/100sqm 1.5-3L/Ha |
Apply every 6-8 weeks or as required |
| Broadacre Crops: | 3-8L/Ha | Apply as required with normal program |
Safety
Safety Guidelines
Do not spray in hot weather conditions. Not compatible with many products. Check the labels and do a jar test first. Iron can stain paths, concrete, paving, clothes, and skin, so always wear old clothes, wash hands after use, and be careful when applying near concrete and paths, etc. Wash off immediately any lasting damage. Keep away from water sources such as ponds, pools, etc. Safe for children & pets when dry. Iron deficiency in many plants & lawns is an indication of high pH or alkaline soil. If yellowing persists or returns rapidly after treatment, soil pH should be checked and adjusted if necessary. Follow application directions as excess liquid iron can lead to other problems, such as zinc and manganese deficiencies. While liquid iron provides immediate relief for plants & soil, it is not an adequate long-term solution for an iron deficiency. Keeping plants/lawn in well-drained soil amended with sulphur to reduce the pH level can help iron in the soil become more available to plants.
FAQ
Should I water the lawn after applying Liquid Iron or wait 24 hours?
Liquid Iron doesn’t have to be watered in, although some prefer to water it in. Either approach is acceptable. Environmental factors such as time of day, wind, rainfall, soil pH, and leaf contact duration can all affect how well Liquid Iron performs. For best results, apply in calm, dry conditions and avoid mowing immediately after application.
Can I mix Liquid Iron with other products?
Liquid Iron should not be mixed with other products, except for Stimulizer. Mixing it with fertilisers or foliar sprays may cause chemical reactions or reduce product effectiveness.
How often should I apply Liquid Iron to my lawn?
Application frequency can depend on your grass type, climate, and soil conditions. Many lawn lovers use it every 2–4 weeks during the growing season to maintain deep green colour and correct iron chlorosis. Always follow label guidelines and adjust based on lawn response.
What are the signs of iron deficiency in lawns and plants?
Look for yellowing leaves with green veins (a condition known as interveinal chlorosis), stunted growth, or a dull, pale lawn colour. These symptoms often indicate that your soil is lacking available iron, especially in alkaline soils or after heavy liming.
Can I use Liquid Iron on garden plants or just grass?
Yes, Liquid Iron is suitable for lawns, ornamentals, shrubs, and fruit trees. It helps correct iron deficiencies and enhances foliage colour across a range of plant types, not just turf.
Is Liquid Iron safe for pets and children?
When used as directed and allowed to dry before re-entry, Liquid Iron is safe for use around children and pets. It’s always a good idea to keep them off the treated area until the lawn is dry.
What’s the best time of day to apply Liquid Iron to my lawn?
Early morning or late afternoon is ideal to avoid leaf burn from midday sun and improve absorption. Avoid applying if rain is expected within a few hours.
Why is my lawn yellow even after fertilising?
If your lawn remains yellow despite regular fertilising, it may be suffering from iron deficiency, especially if the soil is alkaline or compacted. Liquid Iron provides a fast-acting source of iron that can restore colour within days.
Reviews
customer reviews
Showing newest first
Fantastic
i applied this to my lawn! My lawn has never looked so green! will 100% buy again
Great lil Colour Boost
2nd Time Buying this product and it give just a great lil colour boost to the lawn. 1st time I only used it on the footpath as a trial and was happy with the results, Got a bigger bottle this time and use it on the whole lawn!!
Greener Overnight
Purchased A Small 1L bottle as a test for my footpath, sprayed it out and too my surprise the next morning it was noticeably greener. Took only 2 or so more day to get a lovely shade of green. 100% adding this to my arsenal for that lovely green durin winter for my whole lawn.
Great value Iron supplement
Plant Dr Liquid Iron is a great value iron supplement and is especially good when you do not want to add nitrogen to your lawn during the colder months
Liquid Iron
This Iron works beautifully for getting that extra green up for your lawns.Also fast delivery.Thanks Plant Doctor
Awesome product
My lawn has never looked better 12 months in after using 5 different products. Its looking mint !
Liquid iron
Really happy with the results so far, lawn is looking very lush and green since applying! You won’t be disappointed!!
Great product
Works well with my other plant doctor products I use
Highly recommend
I recently purchased this liquid iron fertiliser for my citrus tree. The product arrived promptly and was well-packaged. The instructions provided online are clear and straightforward, making it easy to understand how to apply. I am looking forward to seeing the results once I start using it and will update my review based on the tree’s response. So far, I am impressed with the purchase experience and the quality of the product.
Great service and fast shipping.
Liquid iron Fert is a fantastic product which exceeded my expectations. I’ll be back again!
Amazing
Liquid iron is a top product. Finally got into the swing of spraying and liquid iron is an awesome solution to a super green lawn before house events or if you just want to dominate the neighbourhood! :)
LUSH AND GREEN
Love this product, made my new lawn from light green to a bright vibrant green in only two applications! Highly recommend.
Green green :)
It really makes my grass pop
Liquid Iron
Within 2 days a deep green can be seen. Very easy application and mixing rate.
3rd order - Santa Ana Googong
Hi team, thank you for the prompt delivery across the Dec-Jan period. I have been using your lawn products exclusively and really happy with the results on our lawn, albeit a bit wet here near Canberra in Jan!
I ran out of the liquid iron, Quantum H and Seaweed Secrets earlier than the other products (higher rate of use), I will consider upping to the 10L next round.
I will add some pics to your gallery when I can, but can thoroughly recommend this line of lawn care.
I use a combination of Liquid Iron, Seaweed Secrets, Humic Acid, Stimuliser, Quantum H, Activ8 Mate (changing to Activ8Extra). All applied with a manual backpack sprayer, we have about 100sqm front and 100sqm rear lawn.
Thank you and keep up the great work, cheers Stuart.
PS: Feel free to add this review to Quantum H and Seaweed Secrets as they were purchased with this product.
Improvement overnight!
I applied this product to both my lawn and a plant I have that is iron deficient and have noticed a massive improvement in the plant particularly overnight
Great product, impressive results
This is a great product, with recommended application rates lower than other brands. Easy to apply and yields the expected results. Lush, green grass in no time at all.
Liquid iron
What a great product saw great greening in my grass within one day definitely recommend
Green Gold
What a difference this makes. Makes all the difference for plant health and colour.
Best liquid Iron
This liquid iron is one of the best product I have used. After only 24 hours you can really see the difference in colour in the lawn. I have just applied another application so looking forward to seeing how much this protects the lawn from Frost.
Great Green up
Nice and easy liquid iron deepens the colour of the lawn almost overnight tested it by not spraying the nature strip and the depth of colour is intensly different. Love it
GREEN!
Used this for the second time this week. Within a few hours the lawn seems to take on a great colour. All of the products ive purchased seem to be doing a great job along with the great service from Plant Doctor
Liquid iron
I use this product monthly on my lawn at 200mls/100m2 in 9L water which gives great coverage on the leaves and the greening effect lasts longer when I’m mowing on average every 2-3 days. Applied early in the morning or afternoon and soil has good moisture and I leave it on the leaf. With 9L water per 100m2 I’ve never had my lawn go black or any other negative result as some people may experience when the spray is too concentrated.
Great product for a greening up effect when you don’t need nitrogen and the additional growth.
As an independent agronomist I highly recommend the liquid iron.
Excellent product
This is a great product at a very competitive price. Highly recommend to anyone looking to benefit their lawn. The dark green colour this produces is incredible.
Great Product
Excellent results on my Kik in SEQ, very quick postage and great communication, highly recommend
Liquid Iron
want a greener lawn than your neighbours, this is what you need after your normal fertiliser application.
5 star praise
First time taking on a lawn reno and with help and guidance from the plant doctor my lawn is looking amazing.
This stuff is so easy to use with simple application instructions right there on the bottle you will get results in no time at the fraction of the price
Beautiful green on an early reno
Giving my grass some much needed TLC
If you want dark green lawn - USE THIS
I thought my lawn was prettty green. But after all the positive review for liquid iron on youtube. I thought I'll give this a shot. And wow my lawn has never been this dark emerald green before. Highly recomend this product
Amazing Green Zoysia
I use the Plant Doctor liquid iron on both my Empire and Augusta Zoysia in conjunction Natures Soil Wetter, Seaweed Secrets, Quantum, Stimulizer and Activ8Mate and they bring a depth of healthy colour to my lawn that I have not seen with any other combination of products that I've tried
Amazing
Amazing product! Results are virtually instant and gives the lawn a much needed boost!
Big green up
The perfect product to get your lawn ready for big events, Christmas day, Boxing day etc.
The street envy is real!
Green!
Awesome to be able to buy this one in bulk (20L). Not only quick to arrive but quick results in the lawn also!
DEEP GREEN
Very impressed by this product teamed up with the stimuliser can see results within 5hrs in my zoysia and lasts a good week or so of deep rich green colour and the feel of the lawn is great! Jump on and be the envy of the street
Great product
Excellent product for the fast greening of lawns recommended
Liquid Iron
Next level deep green on lawns. Starts to work within hours. Highly recommend.
Liquid Green Gold
Fantastic product, greened up the patch in days. Economical and good value for your money!
Impressive
A great product which gives you a deep green all year round, even in winter dormancy, highly recommend
Liquid Iron
Have only used this product for a short time, but noticed a huge difference on my lawn after the 1st dose. Great product
The Greenest of lawns
I have been using this product for a couple of months now and I have to say I am really happy with the results. My lawn looks healthy, green and lush. Easy to apply with simple directions and so far producing great results. Very happy.
Essential Lawn Product !
If I had to recommend one product as best bang for buck to improve the look of your lawn then this would be it. Results are noticeable the next day. Plenty of neighbors asking for the secret !
Deep green
Great product to achieve a deep green colour. Looking forward to applying it with PGR
Quick Green up
Definitely another fantastic products from the plant doctor to get a quick green up on the lawn.
Also adding to a little bit of iron and stim in my vegetable garden help the leaf much stronger green.
Would recommended to have this product on their shelves
Great product!
I bought a bulk order of the ben sims pack which included this product and a variety of others. I Have been very satisfied this season with the results. Grass has handled the temperatures well with the assistance to plant doctors foliar products. The turf looks great and loves the applications. At a competitive price, i highly recommend.
the Iron gives it that extra green-up boost and makes the lawn really pop!
Instant green up
I use this product on my lawn for a green up every one to two months. I applied it twice in one month but it was too much and my lawn had an ugly grey colour.
Top shelf iron
One of the best iron products I’ve used on the market.
Deep Green liquid iron
I love this product. Produces a very appealing deep green colour in your lawn and when supplemented by the activ8Extra liquid fertilizer you will get amazing results. I will keep purchasing and using these products. 10/10 would recommend.
A must have for a lush lawn!
I have used various brands of Iron, but nothing comes closer to PD's Iron Fertilizer where results are concerned. Iron is an essential plant food and I usually apply the recommended dose late afternoon to enjoy the results overnight - its so satisfying to see the difference!
So green
Great to add while spraying PGR
Warranty
90 Day Money Back Guarantee
Shop with confidence knowing your purchase is backed by our 100% 90-day money back guarantee. If you're not completely satisfied, simply contact us within 90 days for a refund.
Shipping
Application rates
Get the right amount for your lawn or garden, without the guesswork.
Care calendar
Build a 12-month lawn and garden plan around this product.
Usage guide
A printable guide to how and when to apply Plant Doctor products.
Customer reviews
What customers are saying
5.0
from 0 verified reviews
High quality product and fast shipping
Excellent value product and ready just in time for winter to help my grass keep looking green
Verified review
Fantastic
i applied this to my lawn! My lawn has never looked so green! will 100% buy again
Verified review
Great lil Colour Boost
2nd Time Buying this product and it give just a great lil colour boost to the lawn. 1st time I only used it on the footpath as a trial and was happy with the results, Got a bigger bottle this time and use it on the whole lawn!!
Verified review
Customer gallery
Lawns & gardens
See how Plant Doctor customers used Liquid Iron Lawn Fertiliser 7% Iron & 3% Sulphur, Fulvic Acid Chelated Tonic - 1L in their gardens.
Bruce's Monthly Lawn Care Routine
Read more
Josiah's Lawn Nutrition Routine
Read more
Ashley's Complete Lawn Care Program
Read more
Simon's Lawn Care Routine
Read more
Shoua's Complete Lawn Care Program
Read more
Jordan's Lawn Care Routine
Read more
Blake's Complete Summer Lawn Care Program
Read more
Chris' Lawn Transformation: Building a Healthy, Green Lawn with a Consistent Lawn Care Routine
Read more
Mason's Lawn Transformation: From Yellow Lawn to Healthy Green Turf
Read more
Paul's Hobart Putting Green Lawn: A Professional Ryegrass Care Routine
Read more
Alex's Complete Lawn Care Routine
Read more
Albert's Fortnightly Lawn Care Routine
Read more
Ashley's Lawn Care Routine
Read more
Jono's Kikuyu Overseeding Transformation
Read more
Customer gallery
Lawns & gardens
Real results from Plant Doctor lawnies — see the stories behind the green.
Simon's Lawn Care Routine
A consistent liquid lawn care program focused on soil health, nutrition and vibrant colour.
Read more
Jono's Kikuyu Overseeding Transformation
A detailed lawn care routine supporting an overseeded Kikuyu lawn at a 15 mm height of cut.
Read more
Ian's Lawn Transformation: Reviving a Patchy Lawn with Better Soil Health and Targeted Lawn Care
A recovery-focused lawn care program using soil improvement, biostimulants and seasonal lawn nutrition.
Read more
Money Back Guarantee
Put your mind at ease with our 100% 90 day money back guarantee
Australian Owned
Australian family owned and operated. Online sales since 2009.
Flat Rate Shipping
Flat-rate shipping from $9.95* Fast and affordable!
$9.95 orders under 1kg/1L • $14.95 orders up to 50kg • $49.95 orders over 50kg.
Does not include express. Some location exclusions apply.
View shipping policy for more info
FAST Dispatch
Quick and reliable dispatch Australia-wide*
*Monday - Friday (Excludes Public Holidays)
From verified customers
What gardeners are saying
5.0
from verified reviews
