Spring Spraying Guide: When and How to Hit Weeds on Australian Farms

Why Spring Is the Most Important Spraying Window of the Year

Spring is when the battle against weeds is won or lost. The conditions that drive pasture growth, warming temperatures, soil moisture, and longer days, are the exact same conditions that send weeds into explosive growth. Get in early with a well-timed spray program and you'll knock them back before they set seed and compound next year's problem. Leave it too long, and you're fighting a much harder war come summer.

This guide covers the key spring spraying windows, the weeds worth targeting first, and how to match your sprayer to the job.

The Spring Spraying Calendar: Timing Your Applications

August, September: Early Spring, The Broadleaf Window

This is your prime window for broadleaf weed control in pastures. Weeds are actively growing, they're small and have low reserves, and selective herbicides work best on actively growing tissue. Key targets in this window:

Capeweed, most susceptible when young rosettes are actively growing, before bolting

Thistles (Scotch, Nodding, Variegated), attack before the stem extends; rosette stage is your best opportunity

Dock and Sorrel, treat when actively   growing in early spring for best uptake

Paterson's Curse / Salvation Jane, rosette to early bolt stage, before flowering

Wild turnip and Wild Radish, early vegetative stage before stem extension

Key tip: Always check your pasture species before selecting a herbicide. Some selective broadleaf herbicides can damage legume-based pastures (particularly clovers). Read the label carefully or consult your local agronomist.

September, October: Mid-Spring, Grass Weeds and Fence Lines

As temperatures climb, annual grass weeds begin to stand out against your pasture. This is also the window for cleaning up fence lines, laneways, and around infrastructure before growth becomes unmanageable. Targets:

• Barley grass and ryegrass, in non-selective situations (fence lines, laneways), treat before seed head emergence
• Wild oats, target before the flag leaf stage in cropping situations
• Serrated tussock, actively growing spring plants respond better to treatment than dormant summer plants
• Blackberry and other woody weeds, spring shoot growth is the most susceptible stage; apply systemic herbicides when new growth is actively extending

October, November: Late Spring, Summer Annual Weed Prevention

As spring transitions to summer, the focus shifts to preventing summer annual weeds from establishing. In cropping and horticulture situations, pre-emergent herbicides applied ahead of the summer weed flush can significantly reduce the burden later in the season. This is also the last practical window to manage pasture weeds before dry conditions reduce herbicide uptake.

Matching Your Sprayer to the Spring Job

The right sprayer depends on what you're treating, how large the area is, and how you're moving around your property. Here's how to match equipment to the task.

Small areas, garden beds, and spot treatments

For targeted spot treatments around the homestead, sheds, or garden, handheld and compression sprayers are quick, practical, and require no setup.

• 4L Deluxe Hand Pump Sprayer, ideal for tight spots and individual weed treatment
• 8L Deluxe Hand Pump Sprayer, more capacity for slightly larger areas
• 4L Pro Series Compression Sprayer, pre-pressurised for consistent flow without constant pumping
• 8L Pro Series Compression Sprayer, the go-to for regular spot treatments around the property

Paddock margins, fence lines, and laneways

For working on foot through rougher terrain, around fences, or in areas where a vehicle can't easily go, a backpack sprayer keeps your hands free and your movement unrestricted.

• 15L Home & Garden Backpack Sprayer, comfortable for extended sessions; covers paddock margins and laneways efficiently

Paddocks, pastures, and larger broadacre areas

For anything over a couple of hectares, a vehicle-mounted 12V spot sprayer or UTV sprayer is where the real efficiency gains are. You'll cover more ground in less time and with less physical effort, which means you're more likely to hit the right spray timing window.

• 57L RapidLine 12V Spot Sprayer, compact and capable for smaller paddocks and targeted runs
• 95L RapidLine 12V Spot Sprayer, more capacity for larger areas and fewer refill stops
• 60L Spot Ranger 12V Sprayer w/ Trailer, towable setup for properties that need to move between paddocks
• 57L RapidLine 12V Eco Trailer Sprayer, 1.2m Broadcast Kit, adds strip-spraying capability for fence line and laneway runs

Large properties and UTV users

For serious weed management across large acreage, or for operators running a UTV or side-by-side, the UTV sprayer range delivers the tank capacity and hose reel reach to tackle big properties efficiently.

• 250L Marshal-Q Compact UTV Sprayer, a capable mid-size UTV sprayer for regular farm use
• 250L Marshal-Q Compact UTV Sprayer w/ 30m Poly Hose Reel, adds a hose reel for reaching weeds away from the vehicle track
• 325L Marshal-Q Compact UTV Sprayer, larger tank for longer runs without refilling
• 325L Marshal-Q Compact UTV Sprayer w/ 30m Poly Hose Reel, maximum compact UTV capacity with hose reel reach
• 250L Buddy Marshal-Q Compact UTV Sprayer w/ 50m Buddy Smart Reel, extended smart reel for greater reach across uneven terrain
• 325L Marshal-Q Compact UTV Sprayer w/ 50m Buddy Hose Reel, the flagship compact UTV setup for demanding properties
• 360L UTV Sprayer Sprayscout Buddy w/ 100m Buddy Smart Reel, serious capacity with long-reach smart reel for large paddocks
• 360L UTV Sprayer Sprayscout Buddy w/ 150m Buddy Smart Reel, maximum reach for expansive or difficult terrain
• 600L UTV Sprayer Sprayscout Buddy w/ 100m Buddy Smart Reel, high-volume UTV sprayer for large-scale weed programs
• 600L UTV Sprayer Sprayscout Buddy w/ 150m Buddy Smart Reel, maximum tank and reach for the most demanding farm spraying operations

5 Rules for Getting Spring Spraying Right

1. Spray on the right growth stage, not the calendar date. The calendar is a guide. What matters is the weed's growth stage, check the label for the target growth stage and match your timing to that, not a fixed date.
2. Spray when weeds are actively growing. Herbicide uptake requires active growth. Stressed, dormant, or drought-affected weeds take up far less chemical and give you poor results. After rain and in warming conditions is usually ideal.
3. Avoid spraying in wind. Drift onto non-target species, including your own pasture, crops, or a neighbour's paddock, is a serious issue. Aim for calm mornings with low wind speed.
4. Calibrate your sprayer before the season. An uncalibrated sprayer is either under-dosing (poor results) or over-dosing (wasted chemical and crop damage risk). Run a calibration check at the start of each season.
5. Keep records. Note what you sprayed, where, what rate, and what the outcome was. This is invaluable for planning next year's program and for managing chemical resistance over time.

Before You Start: Sprayer Maintenance Checklist

If your sprayer has been sitting since last season, do these checks before your first spring run:

• Flush the tank and lines with clean water, old chemical residue can damage new applications or harm non-target species
• Check all hose connections and fittings for cracking or weeping
• Inspect nozzles for wear or blockage, worn nozzles affect spray pattern and rate
• Test the pump at operating pressure before loading chemical
• Check and replace any seals or O-rings that look worn or brittle

Browse our full range of Handheld Sprayers, Backpack Sprayers, 12V Spot Sprayers & Trailers, and Sprayer Parts & Accessories. Not sure which sprayer is right for your property? Read our sprayer comparison guide or get in touch and we'll point you in the right direction.