How Much Gallup Weed Killer to Use per Litre: The Ultimate Guide for a Weed-Free Garden

For most home gardeners, the correct Gallup dilution rate is 15ml of concentrate per litre of water for annual grasses and annual broad-leaved weeds. Tougher perennial weeds need more: Gallup Biograde 360 should be mixed at 25ml per litre, while Gallup XL calls for 20-30ml per litre. The exact rate depends on which Gallup product you have and what you are treating.

What is the dilution rate for each Gallup product?

Gallup comes in several formulations, and the rates differ between them. Here is a quick reference:

Barclay, the manufacturer, lists 24ml per litre as the standard rate for Gallup H&G, Gallup XL, and Gallup Biograde 360 when used in a knapsack sprayer. That figure sits neatly between the annual and perennial rates, so if you are treating a mixed patch, 24ml is a reasonable middle ground.

How much area does a litre of diluted solution cover?

Gallup Home & Garden has an application rate of 3 litres of concentrate per hectare for annual weed control, according to Agrigem. A hectare is 10,000 square metres, so for a typical back garden of around 50 square metres you would use a very small amount of concentrate. At 15ml per litre, a single litre of concentrate makes roughly 66 litres of diluted spray, enough to treat a large area several times over.

Annual weeds versus perennial weeds: why the rate changes

Annual weeds, such as groundsel and chickweed, germinate, seed, and die within a single season. Their root systems are shallow and they absorb glyphosate easily, so 15ml per litre is enough to kill them. Perennial weeds, including docks, nettles, and couch grass, store energy in deep root systems and need a higher concentration to ensure the herbicide moves all the way down to the roots. That is why Gallup Biograde 360 steps up to 25ml per litre for perennials, and why Gallup XL's upper rate of 30ml per litre is reserved for stubborn cases.

Which Gallup product do you have?

Check the label before you mix anything. Gallup Home & Garden comes in a 1-litre size and is the version most commonly sold in garden centres. Gallup XL is marketed as a professional-strength formula, available in 5-litre containers from retailers such as Gardeners Dream. Gallup Biograde 360 is also sold in 5-litre sizes and is stocked by trade suppliers including Hygiene Supplies Direct. The product name is printed clearly on the bottle; if you are unsure, the batch number on the cap can be cross-referenced with the Barclay product database.

A note on professional use

Gallup XL product listings on Gardeners Dream carry a reminder that, under DEFRA and HSE rules, anyone applying pesticides professionally must have received adequate training and hold the relevant certification. For home garden use that requirement does not apply, but the label guidance on dilution, protective equipment, and re-entry intervals still applies to everyone.

Dilute 20 - 30ml of the weed killer concentrate per 1 litre of water and works best when used in a sprayer.

By law, everyone who uses pesticides professionally must have received adequate training in using pesticides safely and be skilled in the job they are carrying out.

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