Growing Broccoli: A Complete Profile
By Growing Home Greens Team · July 18, 2026
Broccoli is a cool-season crop wearing a warm-season crop’s growing calendar in a lot of gardens — start it too late in spring and heat pushes it to bolt into loose, bitter flower heads before it ever forms a proper crown.
What to expect
Start seed indoors about 6 weeks before your last frost and transplant out roughly 2 weeks before that date — broccoli tolerates a light frost far better than heat. Give each plant its own square foot; unlike denser greens, broccoli needs the room to bulk up into a full head. The main head comes first, and on most varieties, cutting it promptly encourages smaller side shoots to keep producing for weeks afterward.
Common problems
A head that “buttons” — staying small and forming early instead of growing into a full crown — is almost always a stress response, usually from transplanting too late once temperatures are already climbing, or from a cold snap right after transplant. Loose, yellow-flowering heads mean the plant has already started to bolt; harvest what you can and move on, since the flavor only gets more bitter from there.
Where this fits in your garden
Onion’s scent is reputed to confuse the cabbage moths that target broccoli and other brassicas — see the full companion guide for broccoli. Keep it away from tomatoes, since brassicas and tomatoes compete heavily and can stunt each other in a shared bed. At one plant per square foot, broccoli needs real space in the Garden Designer — it’s not a crop you can tuck into gaps the way basil or lettuce can.
Companion planting guide for Broccoli · Find your planting dates
Typically viable in USDA zones 2-10. Not sure your zone? Look it up by ZIP code.
Method: Start indoors — Start indoors from seed, then transplant outside — Broccoli needs a head start most zones can't give it by direct-sowing alone.
See exact start-indoors, direct-sow, and harvest dates for your zone →
Spacing: 1 per square foot (square-foot-gardening spacing).
Varieties worth considering
- Packman, Green Comet, or Premium Crop — Utah State University Extension credits all three with excellent production and eating quality for home gardens, at 50, 55, and 65 days to maturity respectively — useful if you want to stagger a harvest window instead of one big flush. (source)
Cited from the source shown next to each variety — we haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement.
Where to buy broccoli seeds
Some links on this page go to retailers we may eventually earn a commission from as an affiliate, at no extra cost to you. We only recommend products with a genuine consensus of positive, independent reviews — see the sources cited on each item.
See it growing
Search YouTube for "growing broccoli" videos → (a live search, not a hand-picked video — results vary and aren't vetted by us)