Cauliflower Seeds – Brassica oleracea var. botrytis
Brassica oleracea var. botrytis • Brassicaceae • Native to Mediterranean region
Cauliflower Seeds grow into cool-season plants producing compact, white curds surrounded by green leaves. A dependable choice for vegetable gardens, raised beds, containers, and fresh home cooking.
Plant Name: Cauliflower Seeds
Quantity: 100 Seeds
Selected: Cauliflower Seeds / 100 Seeds
Germination depends on soil, temperature, moisture, and care. See our return policy for details.
At a glance
Cauliflower is highly sensitive to temperature swings, and exposure to hard frost as a young transplant or prolonged heat above 80 degrees Fahrenheit during head formation will cause the curd to become loose, discolored, or fail to form at all.
Botanical profile
Meet the Cauliflower – Brassica oleracea var. botrytis
Step-by-step planting
Growing cauliflower from seed is a season-long commitment that rewards gardeners who plan carefully, pay attention to timing, and stay consistent with water and nutrition through each stage.
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1
Start Seeds Indoors
Sow cauliflower seeds indoors 4 to 6 weeks before your last expected frost date, pressing seeds about a quarter inch deep into a quality seed-starting mix in individual cells or small pots.
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2
Maintain Germination Conditions
Cauliflower seed germination tends to occur within 7 to 14 days when soil temperature is kept consistently between 65 and 75 degrees Fahrenheit, though actual results will vary depending on your specific soil, moisture levels, and growing environment.
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3
Provide Strong Light Early
Once seedlings emerge, move them immediately under grow lights or into a south-facing window to prevent the leggy, weak growth that happens when young brassica seedlings stretch toward insufficient light.
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4
Harden Off Before Transplanting
Spend 7 to 10 days gradually introducing your seedlings to outdoor conditions by setting them outside in a sheltered spot for a few hours each day, increasing exposure time before transplanting them into the garden.
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5
Transplant at the Right Time
Follow your cauliflower planting guide by setting transplants into the garden when daytime temperatures are reliably between 60 and 70 degrees Fahrenheit, spacing plants 18 to 24 inches apart in rich, well-draining soil amended with compost.
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6
Water and Feed Consistently
Cauliflower care tips all come back to consistency, so aim to provide about 1 to 1.5 inches of water per week and side-dress with a balanced fertilizer once plants are established and again when heads begin to form.
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7
Blanch and Harvest on Time
Monitor heads closely as cauliflower harvest time approaches, blanching white varieties by tying outer leaves over the curd when it reaches 2 to 3 inches across, then harvesting when the head is firm, compact, and 6 to 8 inches in diameter before it begins to separate or yellow.
Year-round care
Spring
- Sow after last frost
- prepare soil with compost
Summer
- Water regularly
- feed monthly
Fall
- Harvest before frost
- store well
Winter
- Rest
- store seeds cool and dry
Full specifications
Shipping
- Orders are delivered within 8 to 16 business days.
- All orders include tracking.
- Free shipping on all orders.
- Seeds are packed in moisture-resistant, resealable foil packets.
Germination
Germination rates vary depending on climate, soil conditions, and care. Seeds perform best when planted in the right season at the correct temperature, with consistent moisture and adequate light. We take quality seriously and each batch is tested before packaging. If you have concerns about your seeds, reach out and we will do our best to help.
Frequently asked
Questions about Cauliflower Seeds – Brassica oleracea var. botrytis
When should I start cauliflower seeds indoors?
For a spring crop, start seeds indoors 4 to 6 weeks before your last average frost date so transplants go out while the weather is still cool. For a fall crop, count back from your first expected fall frost by about 10 to 12 weeks and start seeds in midsummer. Timing is everything with this crop because the heads need to mature during cool weather, not heat.
What soil pH does cauliflower prefer?
Cauliflower performs well in soil with a pH between 6.0 and 7.0, with 6.5 being a reliable sweet spot for nutrient availability. Outside this range, plants can struggle to take up calcium and boron, both of which are important for healthy head formation. A simple soil test before planting will tell you whether you need to adjust with lime or sulfur.
How long does cauliflower take to germinate?
Under good conditions with soil temperatures in the 65 to 75 degree Fahrenheit range, cauliflower seed germination typically begins within 7 to 14 days. Cooler soil will slow the process considerably, and seeds sitting in cold or overly wet conditions may rot before they sprout. Germination results vary and depend on seed viability, moisture consistency, and the specific environment you are working with.
Can cauliflower be grown in containers?
Cauliflower can be grown in containers, but it needs more room than most people expect. Choose a container that holds at least 5 gallons per plant, and ideally closer to 7 to 10 gallons, with good drainage holes. Container-grown plants dry out faster and need more frequent watering and feeding than those in the ground, and they are more vulnerable to temperature fluctuations at the roots.
Why is my cauliflower not forming a head?
The most common reasons cauliflower fails to head are heat stress, nitrogen imbalance, or being transplanted too late in the season. Cauliflower needs consistently cool temperatures to trigger proper curd development, so if plants experience a warm spell at the wrong time, heading may be delayed or skipped entirely. Too much nitrogen early on can push leafy growth at the expense of head formation, so balance your fertilizing as plants mature.
What is blanching and does cauliflower need it?
Blanching is the practice of shielding the developing curd from direct sunlight by gathering the large outer leaves over it and securing them loosely with twine or a rubber band. White cauliflower varieties need blanching because sun exposure causes the curd to turn yellow or develop an off flavor, while naturally colored varieties like purple or orange do not require it. Begin blanching when the head is about 2 to 3 inches across and check it every few days as harvest approaches.
How do I know when cauliflower is ready to harvest?
A cauliflower head is ready when it feels firm and dense to the touch, measures roughly 6 to 8 inches across, and still has a tight, compact surface with no signs of the curds separating or flowering. Color should be even and bright, whether white, purple, or orange depending on the variety you planted. Do not wait too long once the head reaches full size because it can go from peak to past peak within just a few days in warm weather.