Growing Poblano Peppers: A Complete Profile
By Growing Home Greens Team · September 30, 2026
Poblano is the broad, dark green chile used for chiles rellenos. Dried at the red stage it becomes ancho, which is why Bonnie Plants sells it as “Poblano (Ancho).”
Mild heat, big fruit
Bonnie rates poblano at 1,000 to 2,000 Scoville units, mild enough that most people eat it as a vegetable. Fruit runs about 4 inches. Johnny’s describes its Bastan hybrid as easy to peel for rellenos, and its Sargento as resistant to phytophthora, the soil-borne blight that takes out peppers in wet, poorly drained beds.
Days and plant size
Burpee lists 65 days and Bonnie at least 75 days from transplant. Plant size is where the sources disagree most: Burpee gives 24 inches, while Bonnie lists poblano as a tall plant at 48 inches and up and recommends spacing them 36 to 48 inches apart. Plan for a larger plant than a jalapeño and stake it.
Start seed indoors about eight weeks before your last frost. The Bell Pepper profile covers the shared care, and the companion guide lists neighbors.
Hot nights and dropped flowers
Pepper flowers fall off without setting fruit when nights stay above about 75°F, per the University of Delaware’s Weekly Crop Update. In zones 9 and up, expect a midsummer gap in fruiting; our zone pages flag it.
Growing it next to other peppers
Different pepper varieties cross-pollinate easily, hot ones included. NC State Extension notes that when hot and sweet peppers cross, the heat shows up in later generations grown from saved seed, and suggests keeping varieties 20 to 30 feet apart if you plan to save your own. Baker Creek, which grows seed for sale, isolates varieties by at least 500 feet. If you buy fresh seed each year, you can plant sweet and hot peppers side by side.
Sources: Bonnie Plants, Poblano (Ancho); Burpee, Poblano Ancho; Johnny’s hot peppers; NC State Extension, Saving Your Own Seed; University of Delaware Weekly Crop Update.
Companion planting guide for Poblano Pepper (Ancho) · Find your planting dates
Typically viable in USDA zones 3-11. Not sure your zone? Look it up by ZIP code.
Mature height: 2-4 ft
Method: Start indoors: Start indoors from seed, then transplant outside. It needs a head start most zones can't give it by direct-sowing alone.
When to plant poblano pepper (ancho), by zone
Every zone poblano pepper (ancho) grows in. Pick your zone in the header and it will be highlighted here. Each zone links to its full page.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 3a & 3b | Apr 4–Apr 11 | Jun 13–Jun 20 | Aug 22–Aug 29 |
| 4a & 4b | Mar 20–Mar 27 | May 29–Jun 5 | Aug 7–Aug 14 |
| 5a & 5b | Mar 15–Mar 22 | May 24–May 31 | Aug 2–Aug 9 |
| 6a & 6b | Feb 28–Mar 7 | May 9–May 16 | Jul 18–Jul 25 |
| 7a & 7b | Feb 13–Feb 20 | Apr 24–May 1 | Jul 3–Jul 10 |
| 8a & 8b | Jan 28–Feb 4 | Apr 8–Apr 15 | Jun 17–Jun 24 |
| 9a & 9b | Dec 21–Dec 28 | Mar 1–Mar 8 | May 10–May 17 |
| 10a & 10bSpring window | Dec–Feb | Feb–Apr | ~70 days after transplanting |
| Summer window | May–Jul | Jul–Sep | ~70 days after transplanting |
| 11a & 11bSummer window | Jun–Dec | Aug–Feb | ~70 days after transplanting |
Harvest dates are about 70 days after the sow or plant-out date, not after starting seeds indoors.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Poblano Pepper (Ancho) plants fit per square foot?
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-4 ft.
Soil & water: pH 6-6.5. Needs well-drained soil. Amend with lime if soil pH falls below 6.
Good companions for poblano pepper (ancho)
- Basil: Reputed to repel aphids and improve pepper growth nearby, but a controlled garden trial testing this same claim on a related crop found no pest-reduction benefit from basil, and found higher pest counts on the basil-companioned plants. Treat this pairing as unproven, not as a working pest deterrent.
- Onion: Reputed to deter many common pepper pests, though this specific pairing hasn't been tested the way onion/carrot pest-masking has. Treat it as garden tradition.
Full companion guide, including what to keep away from poblano pepper (ancho) →
Varieties worth considering
- Sargento (F1) (best for: wet or blight-prone soil): Johnny's lists this poblano as phytophthora-resistant, worth choosing if peppers have collapsed in your beds before. (source)
Why each variety is listed comes from the source shown next to it. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement. The buy links are separate from those sources: they go to seed suppliers that sell that exact variety, and we may earn a commission on some of them.
Where to buy poblano pepper seeds
Botanical Interests · True Leaf Market · Burpee · High Mowing Organic Seeds (each supplier's poblano pepper seeds)
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See it growing
Search YouTube for "growing poblano pepper (ancho)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Poblano Pepper (Ancho): The mild, dark green chile for chiles rellenos, and the source of dried ancho.
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