Featured Products
10% off!
Gibb-Gro Gibberellic Acid Growth Promoter - Grow Grass Really Fast and reduce your Nitrogen inputs.
Gibb-Gro is a high-strength GA3 Gibberellic Aci..
Starting From $155.25 $345.00
Ex Tax:$135.00
15% off!!
WHACK – 2,4-D 800
Contains 800g/kg 2,4-D as the dimethylamine salt in the form of a water soluble granule.
WHACK - 2,4-D 800 is a non-volatile, ..
Starting From $97.75 $115.00
Ex Tax:$85.00
10% off!
Gibber900 - Gibberellic Acid (GA3) 900g/kg Growth Regulator
90% strength gibberellic acid; a natural plant growth regulator that has been used succ..
Starting From $36.23 $40.25
Ex Tax:$31.50
20% off!
A natural high quality ascophyllum nodosum seaweed concentrate to promote water absorption and retention activity in the soil, which helps break down ..
Starting From $9.20 $11.50
Ex Tax:$8.00
10% off!
Contains: glufosinate-ammonium 200g/litre in the form of a soluble liquid concentrate.
GA200 weed spray controls a wide range of weeds, grasses, an..
Starting From $49.68 $55.20
Ex Tax:$43.20
20% off!
🔥 Bestseller
Organosilicones provide optimum penetration into woody-stemmed species (gorse, blackberry, etc).
Faster uptake by the plant; reduces rain risk.
Boos..
Starting From $34.41 $43.01
Ex Tax:$29.92
15% off!!
Contains 750g/L of MCPA dimethylamine salt as a water-soluble concentrate.
Rainbow & Brown's MCPA750 herbicide is for the control of thistles and ..
Starting From $76.25 $89.70
Ex Tax:$66.30
20% off!
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Product Benefits: Low Cost Gorse and Scrub Control Herbicide
MPN: metsulfuron-methyl 600g/kg
LOW COST Gorse and Scrub Control Herbicide. The lowest cost gorse killer in our range, MSF600 metsulfuron-methyl herbicide is popular and proven in NZ..
Starting From $29.44 $36.80
Ex Tax:$25.60
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Contains: 300g/L triclopyr as the butoxy ethyl ester plus 100g/L picloram as the amine salt in the form of an emulsifiable concentrate.
Similar or ..
Starting From $69.00
Ex Tax:$60.00
STOCK DUE EARLY JUNE 2026
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Out Of Stock
Contains: 360g/L glyphosate as a soluble concentrate.
Rainbow & Brown's Glyphosate 360 weedkiller is a popular choice for total weed control and fo..
Starting From $61.00
Ex Tax:$53.04
20% off!
🔥 Bestseller
Product Benefits: Low Cost Gorse and Scrub Control Herbicide
MPN: metsulfuron-methyl 600g/kg
LOW COST Gorse and Scrub Control Herbicide. The lowest cost gorse killer in our range, MSF600 metsulfuron-methyl herbicide is popular and proven in NZ..
Starting From $29.44 $36.80
Ex Tax:$25.60
20% off!
🔥 Bestseller
Organosilicones provide optimum penetration into woody-stemmed species (gorse, blackberry, etc).
Faster uptake by the plant; reduces rain risk.
Boos..
Starting From $34.41 $43.01
Ex Tax:$29.92
PRICE REDUCED
🔥 Bestseller
Contains: 800g/kg glyphosate as water-soluble granules.
Granny high-strength glyphosate weedkiller has no residual effect in the soil; drill new se..
Starting From $55.20
Ex Tax:$48.00
STOCK DUE EARLY JUNE 2026
Out Of Stock
Glyphosate 540
Contains: 540g/L glyphosate potassium salt as a soluble concentrate.
Rainbow & Brown's Glyphosate 540 weedkiller is a new technol..
Starting From $29.00
Ex Tax:$25.22
TRICLO HERBICIDE
Contains 600g/L triclopyr as the butoxy ethyl ester in the form of an emulsifiable concentrate.
Triclo Herbicide is a selective..
Starting From $90.85
Ex Tax:$79.00
Spraywetter with Herbicides
Spraywetter non-ionic surfactant, improves penetration, especially into harder and waxy plants. Faster uptake by the pl..
Starting From $44.85
Ex Tax:$39.00
From our Blog
28 May
0
5
Quick answer: Foliar fertilisation means spraying dissolved nutrients directly onto plant leaves, where they're absorbed through the leaf surface and bypass the soil entirely. It's most useful for correcting mid-season deficiencies quickly, delivering micronutrients that soil chemistry is locking up, and supporting plants at critical growth stage..
10 Mar
0
12008
Note: This article was last updated March 2026
What Can We Use Instead of Banvine(1)?
Quick answer: Banvine(1) contained 200g/L 2,4-D and 100g/L dicamba. The closest ready-mixed alternative from Rainbow & Brown is LawnMate. A lower-cost option is to use individual herbicides such as WHACK – 2,4-D 800 and Rainbow & Brown Dicamba 500 SL, but any ..
09 Mar
0
821
Fulvic Acid Explained: How Fulvex 9500 Unlocks Nutrients Plants Can Actually Use
Category: Soil Health
Quick answer: Fulvic acid helps plants access nutrients that may already exist in the soil but are chemically locked up and unavailable. Fulvex 9500 is a highly concentrated 95% pure fulvic acid that works as a natural chelator, binding minera..