Australian Winter Produce Guide: What’s in Season and What’s on It
There’s a common assumption that summer produce is the one to watch. Hot weather, longer growing seasons, more spraying. And while that’s partly true, winter tells a more complicated story.
Cool, wet growing conditions drive heavy fungal pressure, which means increased fungicide use across a range of crops. Slow growth cycles mean produce spends longer in the ground and more time exposed to what’s in the soil. And several of the most popular winter vegetables, broccoli, cauliflower, leafy greens, and apples, are crops that consistently show higher residue levels in standard monitoring data.
None of this is cause for alarm. It is cause for a more considered approach to washing.
This guide covers the key winter fruit and vegetables in Australia right now: what’s in season, what pesticide risk generally looks like for each one, and what actually removes residue from the surface. Because rinsing and cleaning are not the same thing, and knowing the difference changes how you shop and how you prepare.
Broccoli
Peak Australian season: June through September.
Broccoli is a cool-season brassica that thrives in winter conditions, which makes it abundant, affordable, and genuinely good eating right now. It’s also one of the more challenging vegetables from a residue standpoint, not because it’s sprayed more heavily than other crops, but because of its structure.
The dense, tightly packed florets create a large surface area with plenty of recessed spaces. Residue settles into those gaps. A water rinse across the top moves surface material but doesn’t penetrate the floret structure where residue accumulates. Submerging helps, but doesn’t fully solve it.
Washing tip: Plain water removes around 20-30% of oil-based residue from produce surfaces. Crop DeTox uses electrolysis to generate HOCl (hypochlorous acid), which breaks down oil-based residues rather than simply rinsing across them. Run the leafy/cruciferous cycle: 10 minutes.
Cauliflower
Peak Australian season: June through October.
Cauliflower shares much of broccoli’s story. Its tightly packed curd presents a similar challenge: a large, layered surface where residue can lodge and a structure that a water rinse doesn’t easily reach into.
Cool and wet winter growing conditions also increase fungal risk for cauliflower, which typically means more fungicide use during the growing cycle. The outer leaves protect the curd during growth, but residue can migrate from leaf to head, particularly in conventionally grown crops.
Washing tip: Crop DeTox cycle: 10 minutes (cruciferous/leafy setting). For whole heads, position the curd face down so the cycle can work across the densest surface.
Spinach and Kale
Peak Australian season: year-round, with winter varieties spending longer in the field.
Both spinach and kale are leafy greens with a large surface area, which is one of the characteristics associated with higher residue presence in standard monitoring. The rough, slightly textured surface of spinach leaves and the deep ridges in kale hold residue more effectively than smooth-skinned produce.
Pre-washed bags of spinach and salad leaves are a particular point of consideration. Pre-washing refers to a rinse applied before packaging, typically with plain water. Given that plain water removes around 20-30% of oil-based residue, “pre-washed” on the label is not the same as clean.
Washing tip: Crop DeTox cycle: 10 minutes (leafy greens setting). This applies whether you’re washing loose leaves or pre-washed bag spinach. The cycle time accounts for the leaf structure and surface area.
Citrus
Peak Australian season: June through September for oranges, mandarins, and grapefruit. Lemons and limes available year-round.
If you use the zest, citrus is the produce category where washing matters most. Conventional citrus commonly receives post-harvest treatments applied directly to the peel after picking. This is standard industry practice for extending shelf life and managing surface mould during transport and storage. The residue from these treatments sits on the outer skin.
Most people wash citrus quickly, if at all, particularly if they’re only peeling it. But if you’re zesting or using the peel in cooking, what’s on the outside ends up in the dish.
Washing tip: Crop DeTox cycle: 6 minutes (standard/citrus setting). Run this cycle before zesting, or before halving lemons you’re squeezing by hand into drinks.
Carrots
Peak Australian season: available year-round, with solid winter quality from Queensland and South Australian growing regions.
Root vegetables present a different kind of consideration. Because carrots grow in the soil, they can absorb what’s in that soil through their skin during growth, not just accumulate surface residue like above-ground crops do. They’re also treated to manage underground pests during the growing cycle.
Peeling helps remove outer skin and the residue attached to it. But peeling also removes much of the nutritional density concentrated near the surface. Washing thoroughly before peeling, or keeping the skin on cleaned carrots, is a reasonable middle ground.
Washing tip: Crop DeTox cycle: 6 minutes (standard setting). Works whether you’re washing whole carrots before peeling or skin-on carrots for roasting.
Apples and Pears
Peak Australian season: winter apple varieties including Granny Smith, Pink Lady, and Fuji. Pears including Beurre Bosc and Packham available from March through September.
Apples are one of the more consistently sprayed orchard fruits in conventional agriculture. Orchards require ongoing pest management across the growing season, and apples also commonly receive post-harvest waxing, either with natural or synthetic wax, to improve appearance and extend shelf life. That wax layer, whether natural or applied, also retains residue beneath and within it.
Scrubbing with water improves results compared to a simple rinse, but still operates within the limitations of plain water as a solvent for oil-based residues.
Washing tip: Crop DeTox cycle: 6 minutes (standard setting). Particularly useful for apples that are eaten skin-on, which is most of them.
Leeks
Peak Australian season: July through September.
Leeks are underrated and underused, which is a shame because they’re excellent right now. They’re also a crop that grows slowly, which means more time in the ground and more opportunity for treatment during growth.
Their layered structure is also a consideration. Residue can work its way between the leaf layers, and a rinse across the top of a leek doesn’t reach the inner layers where it may have accumulated. Slicing before washing helps, but the surface area involved makes mechanical washing difficult.
Washing tip: Crop DeTox cycle: 6 minutes (standard setting). Slice leeks lengthways first to open the layers, then run the cycle. This allows the HOCl to reach between layers rather than just treating the outer surface.
What Plain Water Is and Isn’t Doing
Most people rinse their produce. The assumption is that a rinse is doing most of the work.
A 2026 study published in Frontiers in Environmental Health quantified what that work actually amounts to: a plain water rinse removes approximately 20-30% of oil-based pesticide residue from produce surfaces. The reason is straightforward. Most agricultural chemicals are designed to be rain-resistant, which means oil-based formulations that adhere to plant surfaces. Water is not oil-soluble. It moves surface material around, but it doesn’t break down or lift off the residue that has adhered.
Scrubbing improves results mechanically, but operates within the same chemical limitation.
HOCl (hypochlorous acid) works differently. It’s the compound your white blood cells produce as part of the immune response, and it’s been used in food processing for decades because of its efficacy against both bacteria and surface contaminants. It breaks down oil-based residues at a molecular level rather than simply rinsing across them.
Crop DeTox generates HOCl through electrolysis, bringing that same food processing chemistry to a kitchen-scale device. In independent laboratory testing conducted by GDCM across 2023 and 2024, Crop DeTox removed up to 97% of pesticide residue from produce, and over 99.99% of bacteria including E. coli, H. pylori, and Salmonella.
The Practical Approach
None of this requires overhauling how you shop. Winter produce, including the crops listed here, is good food. Broccoli and cauliflower are nutritional staples. Spinach and kale belong in most diets. Citrus is peak season and genuinely excellent right now.
The shift is simply in how you clean it before eating.
Plain water is not nothing. It removes some surface contamination and rinses away visible dirt. But for a meaningful reduction in pesticide residue exposure, particularly for produce that’s eaten skin-on, used in baby and children’s food, or consumed in large quantities week to week, a more effective washing method is worth having in the kitchen.
Clean Produce, Simply
The Crop DeTox Food Purifier uses electrolysis to generate HOCl and runs in 6 or 10 minute cycles depending on the produce type. No chemicals, no filters to replace, no complicated setup. Fill with tap or spring water, add produce, press the button.
$169 AUD. Shop the Crop DeTox Food Purifier here.
Winter is the right time to make the habit.
This article pairs with our Winter Produce Carousel on Instagram. Follow @cropdetox for daily produce tips and guides throughout the season.