Cauliflower Macerata Green

🌱 Sowing Cauliflower: Seed Starting in Detail

Seed Trays

Starting in seed trays is often the easiest way to get cauliflower off to a healthy start. Fill your trays with a quality seed-raising mix that drains well but also holds moisture. Cauliflower seeds are tiny, so you only need to sow them about 1 cm deep. Plant one or two seeds per cell—this way, you can thin to the strongest seedling later.

Keep the soil lightly moist, not soggy, and place the trays in a warm spot. Ideal germination temperatures are around 18–22°C. In most parts of Australia, indoor windowsills, heated propagators, or shaded verandahs work well. Seedlings usually appear in 7–10 days, and you’ll notice tiny green leaves unfurling—the first signs that your careful attention is paying off.

Once the seedlings develop 4–6 true leaves, they’re ready for transplanting. Harden them off for a week first: gradually introduce them to outdoor conditions, starting with a few hours of morning sun and sheltered conditions, increasing daily. This reduces transplant shock and helps them establish faster in the garden.

Direct Seeding

Direct seeding into the garden is straightforward and can save a step, but it does leave young plants exposed to the elements. Sow seeds about 1 cm deep in prepared soil, spacing them roughly 30 cm apart in rows that are 40 cm apart. Once seedlings have developed a few leaves, thin them to 40–50 cm apart. This ensures each plant has enough room to grow, prevents overcrowding, and reduces disease risk.

Direct seeding works best when soil temperatures are warm enough to encourage quick germination. In cooler areas, starting in trays and transplanting is often a safer bet to avoid slow germination or loss to pests.

Seed Pre-Treatment

Most cauliflower seeds don’t require pre-treatment; simply sow them directly. However, if your soil is cool or you want to speed up germination, soaking seeds in warm water for 4–6 hours can help soften the seed coat and encourage faster sprouting. Avoid leaving them too long, as seeds can rot if over-soaked.

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🌿 Soil & Position

Cauliflower thrives in rich, fertile soil. Choose a sunny spot that receives at least 6 hours of light per day. The soil should be deep and well-draining, enriched with compost or well-rotted manure. A slightly acidic to neutral soil pH of 6.5–7.0 is ideal. Before planting, work the soil thoroughly to remove stones and improve structure. Spacing is important—allow 40–50 cm between plants to give them plenty of room for their heads to develop and air to circulate.

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🌾 Care & Maintenance

Cauliflower plants need consistent care. Keep the soil evenly moist, especially during dry spells. Mulching with organic material such as sugarcane mulch or straw helps retain moisture, suppress weeds, and keep roots cool. Feed plants with a balanced fertilizer every 2–3 weeks. Once the curds begin forming, switch to a fertilizer higher in potassium and calcium to support healthy head development and prevent discolouration.

To maintain bright white curds, fold the outer leaves over the head as it grows. This process, called blanching, shields the curd from sunlight and prevents yellowing.

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🌼 Companion Planting

Cauliflower enjoys being near certain plants that boost growth or deter pests. Good companions include onions, dill, chamomile, and celery. These can improve flavour, attract beneficial insects, and keep pests at bay. Avoid planting cauliflower near other brassicas like cabbage, broccoli, or kale to reduce competition and minimize shared pests and diseases.

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🌾 Harvesting

Cauliflowers are typically ready to harvest 12–14 weeks after transplanting or direct sowing. The heads should be firm, compact, and around 20 cm across. Cut with a sharp knife, leaving a few protective leaves attached. Regularly check your plants so you can harvest at peak firmness before the curds start loosening.

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🐛 Common Issues & Fixes

Issue	Cause	Solution
Buttoning	Stress from cold, heat, or irregular watering	Keep watering consistent, avoid overcrowding, and protect seedlings during extreme weather
Leggy Seedlings	Insufficient light or overcrowding	Start seeds in a bright spot, use grow lights if necessary, and thin seedlings
Curd Discolouration	Nutrient imbalance or too much sun	Fertilise appropriately and use blanching to protect curds
Pest Infestation	Aphids, caterpillars, whiteflies	Use organic pesticides or introduce beneficial insects like ladybugs

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🌾 Seed Saving Guide

Saving your own cauliflower seeds is easy with a bit of planning.

1. Select Healthy Plants – Choose the strongest, healthiest plants with fully developed heads.
2. Allow to Flower – Let the selected plants bolt and flower. Cauliflower is biennial, so you may need to overwinter the plant or store it until the next season.
3. Harvest Seeds – Once flowers produce seed pods and they dry on the plant, collect them.
4. Dry and Store – Ensure seeds are fully dry before storing in an airtight container in a cool, dry spot.
5. Label Clearly – Note the variety and year to keep your seed collection organised.

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🌻 Final Thoughts

Growing cauliflower from seed in Australia can be both rewarding and fun. The key is starting your seeds well—whether in trays or direct in the garden—providing rich soil, adequate sunlight, and consistent care. Keep an eye out for pests, maintain moisture, and don’t be afraid to experiment with companion planting. With patience and attention, you’ll enjoy a bountiful harvest of crisp, homegrown cauliflower that’s worth every minute of care.

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Delivery Guarantee

We take great care to make sure your seeds arrive safely. If your order is lost or damaged in transit, we’ll happily send a replacement. Unfortunately, we can’t replace or refund orders that arrive later than the estimated delivery date, as delays can sometimes occur that are outside our control.

Please note that all dispatch and delivery times listed are estimates only. While we do our best to post promptly, delivery timeframes can vary due to postal service delays, weather events, or other unforeseen circumstances. We’re unable to take responsibility for any loss, damage, or cost that results from a late delivery.

An order is not considered missing until at least 20 business days have passed from the postage date. You’ll receive an email once your seeds have been posted, letting you know they’re on their way. If you don’t see it in your main inbox, please check your Spam or Promotions folders as sometimes our emails like to hide there.