Heirloom · Open-Pollinated · 58–80 days from transplant
cool-season · timing varies by zone
Grows well in
Raised Bed ✓
In-Ground ✓
Container/Pot ✓
Grow Bag ✓
Meet This Plant
You've seen Calabrese broccoli your whole life. It's the big green head at every grocery store and on every vegetable tray at every party you've ever attended.
What you haven't seen is what happens after you cut that head in your own garden. Side shoots keep coming for weeks. It's a heavy feeder that wants cool weather and consistent moisture, and it will pay you back generously for both.
What it tastes like: Fresh and mildly sweet with a slight bitterness that disappears when cooked. Nothing like the waterlogged florets from a grocery store steam bag.
How to Grow It
Sun
Full sun, at least 6 hours a day. Less sun means slower maturation and smaller heads.
Water
Broccoli is thirsty. Keep soil consistently moist throughout the season.
Sowing Details
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Depth¼–½ inch
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Spacing18–24 inches
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Row Spacing24–36 inches
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Thinning18–24 inches
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Germination5–10 days (slower in cool soil)
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Days to Maturity58–80 days from transplant · ~90–110 days from seed
When to Plant
For spring, start indoors 4–6 weeks before your last frost. Transplant out 2–3 weeks before your last frost when daytime temperatures are consistently in the 40s to 50s°F.
For fall, start indoors 10–12 weeks before your first fall frost or once daytime temperatures begin dropping below about 75°F, and transplant out in late summer.
Zones 7–8
For fall, start seeds indoors in late summer and transplant once daytime temperatures start dropping below 80°F, typically 8–10 weeks before your first fall frost. This is your most reliable season.
For spring, start seeds indoors in late winter and transplant while daytime temperatures are still in the 50s to 60s°F, typically 4–6 weeks before your last frost. Get them in early. Rising temperatures lead to buttoning or bolting before plants reach full size.
Zones 9–11
Fall through early spring is your window. Start seeds indoors in late summer and transplant once temperatures begin cooling, typically around your first fall frost window. Spring crops are possible if planted very early but the heat arrives fast.
Grow Friend Tips
Harvest the main head before it flowers and you'll get weeks of side shoots
The main head is ready when it's 4–7 inches across and the buds are tight and dark green. Cut it. That's when the real bonus kicks in. Smaller side shoots start forming all over the plant and keep coming for a month or more. Keep harvesting and they keep coming. Wait too long and yellow buds mean it's over.
Broccoli is a heavy feeder. Treat it like one.
Side dress with compost or a balanced fertilizer a few weeks after transplanting. Nutrient-poor soil shows up fast as pale, slow-growing plants with disappointing heads. Rich soil makes a noticeable difference.
Rotate it every year
Don't plant broccoli where any brassica grew in the last three years. Clubroot and other soil-borne diseases build up fast in the same spot. Plant it somewhere different and your plants will stay healthier with almost no extra effort.
Row cover is your best friend early on
Flea beetles shred seedlings fast. Get row cover on at planting and leave it until plants are established. Cabbageworm shows up later, so check the undersides of leaves weekly and pick them off by hand. Bt works if things get out of hand.
Companion plants
Dill
Nasturtium
Marigold
Garlic
Celery
Onion
Chamomile
Harvest & What to Do With It
When it's ready
The main head should be 4–7 inches across with buds that are tight and dark green. If the buds start to separate or show any yellow, harvest immediately. Side shoots are ready when they're a few inches long with tight buds. Same rule applies.
How to harvest
Cut the main head with a sharp knife, leaving 5–6 inches of stem. Make a slanted cut so water doesn't pool and rot the stalk. After that, check every few days and cut side shoots as they develop.
Yield
One main head per plant, then several weeks of smaller side shoots. Plant a few at a time every couple of weeks for a steady flow rather than a bunch all at once.
Short-term storage
Refrigerate dry in a loose bag and wash right before use. Good for about 3–7 days. Broccoli declines fast after harvest. Don't let it sit.
Long-term storage
✅
Freezing: Blanch 3 minutes, ice bath, dry well, freeze flat then bag. Keeps up to 12 months. Best texture of any preservation method for broccoli.
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Dehydrating: Blanch first, then dehydrate at 125°F until completely dry. Good crumbled into soups. Keeps 6–12 months airtight.
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Refrigerator pickling: Quick pickled florets with vinegar, garlic, and red pepper flakes. Keeps 2–3 weeks in the fridge.
❌
Pressure canning: Broccoli can be pressure canned safely, but it turns mushy and sulfurous. Not worth the effort or the smell. Most gardeners prefer freezing.
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Water bath canning: Low-acid vegetable. Not safe on its own.
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Root cellaring: Doesn't hold up outside of refrigeration.
What to cook
Roast it at high heat until the edges char. That's the move most people skip and shouldn't. It also holds up well in stir fries, soups, and pasta where it absorbs flavor without falling apart.
Seed Storage & Saving
| Variety |
Calabrese Broccoli |
| Type |
Heirloom · Open-Pollinated |
| Seeds per packet |
~150 seeds |
Storing unused seeds: Keep somewhere cool, dark, and dry. Viable 3–5 years.
Seed saving: Calabrese is a biennial. It sets seed in year two. Let a few plants overwinter and bolt in spring, then collect pods once they're fully dry. Crosses freely with other Brassica oleracea crops including kale, cabbage, and cauliflower. You need at least ½ mile of distance from any flowering relatives to keep the variety true.
