Poblano 'Tiburon'
Capsicum annuum 'Tiburon'
A premium hybrid poblano developed for consistently large, thick-walled fruits that are perfect for chiles rellenos and roasting. Tiburon produces heart-shaped peppers with mild heat and rich flavor, while offering improved disease resistance and more uniform fruit set than traditional poblano varieties. This variety excels in both home gardens and commercial production.
Harvest
75-85d
Days to harvest
Sun
Full sun
Zones
4–11
USDA hardiness
Height
1-3 feet
Planting Timeline
Showing dates for Poblano 'Tiburon' in USDA Zone 7
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Poblano 'Tiburon' · Zones 4–11
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 3 | April – April | June – July | — | September – October |
| Zone 4 | March – April | June – June | — | August – October |
| Zone 5 | March – March | May – June | — | August – October |
| Zone 6 | March – March | May – June | — | August – October |
| Zone 7 | February – March | April – May | — | July – September |
| Zone 8 | February – February | April – May | — | July – September |
| Zone 9 | January – January | March – April | — | June – August |
| Zone 10 | January – January | February – March | — | May – July |
| Zone 1 | May – May | July – August | — | October – August |
| Zone 2 | April – May | June – July | — | September – September |
| Zone 11 | January – January | January – February | — | April – June |
| Zone 12 | January – January | January – February | — | April – June |
| Zone 13 | January – January | January – February | — | April – June |
Succession Planting
Tiburon poblanos keep producing on the same plant from roughly July through September in zone 7, so you don't succession-sow them the way you would lettuce or snap beans. Start seeds indoors in February or March — germination takes 12 to 18 days, and you want 8 to 10 weeks of indoor time before transplanting out in April or May. One planting per season is standard.
If you want to stretch what you get out of a single planting, stagger your harvest instead of your sow dates. Pull fruits green at around 75 days for fresh poblanos; let others go the full 85 days and turn red for drying into anchos. Same plants, two different products, no extra seed starts required.
Complete Growing Guide
This hybrid requires consistent warmth and won't set fruit reliably below 70°F, so delay planting until soil reaches 65°F and nighttime temperatures stay above 60°F—typically 2-3 weeks later than standard peppers. Tiburon's thick walls and large fruit size demand steady, moderate nitrogen rather than high-nitrogen fertilizer that promotes excessive leaf growth at the expense of flowering. The variety shows improved resistance to phytophthora and bacterial spot compared to older poblano cultivars, but remains susceptible to spider mites in hot, dry conditions, so maintain consistent soil moisture and consider overhead misting during peak heat. Plants can stretch in low-light conditions, so provide at least six hours of direct sun daily. A practical strategy: pinch the first flower clusters when plants reach 12 inches tall to encourage branching and more uniform fruit production, resulting in higher yields of the consistently large peppers this variety promises.
Light: Full sun (6 or more hours of direct sunlight a day). Soil: Clay, High Organic Matter, Loam (Silt), Sand. Soil pH: Acid (<6.0), Alkaline (>8.0), Neutral (6.0-8.0). Drainage: Good Drainage. Height: 1 ft. 0 in. - 3 ft. 8 in.. Spread: 0 ft. 6 in. - 1 ft. 0 in.. Spacing: 12 inches-3 feet. Growth rate: Medium. Maintenance: Low. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.
Harvesting
Poblano 'Tiburon' peppers reach peak harvest maturity when they develop their characteristic dark green color and achieve full heart-shaped form, typically 4-6 inches long with noticeably thick, firm walls that resist slight finger pressure. Watch for a subtle glossy sheen on the skin and a slight give when squeezed, indicating optimal flesh thickness. This variety supports continuous harvesting throughout the season—picking mature green peppers encourages further flowering and fruit set, though allowing select fruits to fully mature on the plant intensifies their rich, earthy flavor. For best results with 'Tiburon', harvest in the early morning when peppers are crisp and fully hydrated, which ensures maximum wall thickness and extends their storage life compared to afternoon picking.
Fruits are a non-pulpy berry and vary considerably across cultivars. Some are long, thin, bright red, and spicy; others are thick, large, and sweet-tasting; others still are small and in ornamental shapes and colors, grown as decoration.
Color: Black, Gold/Yellow, Green, Orange, Red/Burgundy. Type: Berry. Length: 1-3 inches. Width: < 1 inch.
Garden value: Edible, Good Dried, Showy
Harvest time: Summer
Edibility: Fruits edible, but spiciness is unpredictable in intensity.
Storage & Preservation
Store fresh Poblano 'Tiburon' peppers in the refrigerator at 45–50°F with 85–90% humidity, ideally in a perforated plastic bag in the crisper drawer. They'll keep for two to three weeks under these conditions. For longer preservation, freezing works well: roast and peel the peppers, then freeze whole or sliced on a tray before transferring to freezer bags for up to eight months. Canning is reliable for salsas and pickled preparations, following tested recipes for safety. Drying is particularly rewarding with this variety—allow peppers to mature fully on the plant until deep red, then hang-dry in warm, well-ventilated space for four to six weeks to create true ancho chiles, which store indefinitely in airtight containers. Poblanos also take well to fermenting; pack with salt and whey for complex flavor development over several weeks.
History & Origin
Poblano 'Tiburon' is a modern hybrid poblano pepper developed to address the consistency challenges of traditional landrace poblanos, which have long been cultivated throughout Mexico and the American Southwest. While specific breeder credits and introduction dates remain undocumented in widely available horticultural records, the variety reflects contemporary vegetable breeding practices emphasizing uniform fruit size, thick walls ideal for stuffing, and disease resistance—characteristics prioritized by both commercial growers and home gardeners. The 'Tiburon' designation suggests commercial seed company development, likely introduced within the past two decades as part of the broader movement to standardize heirloom pepper types for modern production systems while maintaining the mild heat and rich flavor characteristics that define quality poblano peppers.
Origin: Tropical North and South America
Advantages
- +Large, thick-walled fruits ideal for chiles rellenos and roasting applications
- +Consistently uniform fruit set produces more reliable harvests than traditional poblanos
- +Heart-shaped peppers with rich, earthy flavor and mild, manageable heat level
- +Improved disease resistance compared to standard poblano varieties reduces crop loss
- +Medium maturity window of 75-85 days allows reasonable growing season flexibility
Considerations
- -Vulnerable to phytophthora blight in humid or poorly-drained growing conditions
- -Susceptible to pepper weevil infestations requiring vigilant pest monitoring and management
- -Requires moderate growing skill and consistent care for optimal performance results
Companion Plants
Basil is worth planting within 12 to 18 inches of Tiburon poblanos. Its volatile oils are credited with confusing aphids and spider mites, and while the research isn't airtight, the practical track record is good enough that I do it every year. Marigolds (Tagetes spp.) pull double duty: they draw aphids away from peppers and, if you're using French marigolds specifically, they suppress root-knot nematodes in the soil below them. Carrots can share the row without much friction — their roots work well below pepper root depth and don't compete for the same moisture. Chives at the bed edge are compact enough to stay out of the way and may slow aphid pressure from the outside in.
Keep fennel, black walnut, and brassicas off the same bed entirely. Fennel (Foeniculum vulgare) is allelopathic — the compounds it releases through its roots stunt most vegetables around it, and peppers are not an exception. Black walnut (Juglans nigra) produces juglone in its roots and leaf litter, and nightshades as a family are particularly sensitive to it. Brassicas aren't allelopathic in the same way, but they compete hard for nitrogen and share enough insect pressure — cabbage worms, aphids, flea beetles — that putting them next to peppers just hands pests an easy commute.
Tomatoes make a practical neighbor for Tiburon in our zone 7 Georgia garden: same transplant window (April through May), same 1 to 1.5 inches of water per week, compatible soil pH. The one caution is spacing — give each plant the full 18 to 24 inches it needs. Pack nightshades too close and you create the humid canopy that lets bacterial spot and Phytophthora blight move between crops.
Plant Together
Basil
Repels aphids, spider mites, and thrips while potentially improving pepper flavor
Marigold
Deters nematodes, aphids, and whiteflies with natural compounds
Tomato
Similar growing requirements and can share support structures
Oregano
Repels cucumber beetles and provides ground cover to retain soil moisture
Parsley
Attracts beneficial insects like hoverflies that prey on pepper pests
Carrots
Loose soil cultivation around carrots benefits pepper root development
Nasturtium
Acts as trap crop for aphids and cucumber beetles
Chives
Repels aphids and may help prevent fungal diseases
Keep Apart
Black Walnut
Produces juglone toxin that severely stunts pepper growth and yield
Fennel
Releases allelopathic compounds that inhibit pepper germination and growth
Brassicas
Heavy nitrogen feeders that compete with peppers and may stunt growth
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #2747662)
Pests & Disease Resistance
Resistance
Resistant to tobacco mosaic virus and bacterial leaf spot
Common Pests
Pepper weevil, aphids, spider mites, cutworms
Diseases
Phytophthora blight, bacterial spot, anthracnose
Troubleshooting Poblano 'Tiburon'
What you'll see, why it happens, and what to do about it.
Sunken, dark, leathery patch on the bottom (or side) of the fruit — shows up around the time peppers start sizing up
Likely Causes
- Blossom end rot — a localized calcium deficiency in the developing fruit, not always a soil calcium shortage
- Inconsistent watering causing water stress that interrupts calcium uptake
- High ammonium-nitrogen fertilizer pushing vegetative growth faster than calcium can move into the fruit
What to Do
- 1.Water deeply and consistently — 1 to 1.5 inches per week; wild swings between dry and wet are the main trigger
- 2.Mulch the bed to hold soil moisture steady; UGA's vegetable calendar specifically recommends mulching peppers before dry spells hit, ideally by blooming time
- 3.Back off heavy nitrogen fertilizers mid-season; switch to a lower-nitrogen side-dress once fruit sets
Small, water-soaked spots on leaves and fruit that turn brown and scabby, sometimes with a yellow halo — gets worse during wet Georgia summers
Likely Causes
- Bacterial spot (Xanthomonas campestris pv. vesicatoria) — spreads fast in warm, rainy weather via splashing water
- Overhead irrigation keeping foliage wet for extended periods
What to Do
- 1.Switch to drip irrigation or water at the base; keeping leaves dry is the most effective control available once the disease is present
- 2.Remove and bag heavily infected leaves — don't compost them
- 3.Rotate this bed out of nightshades (tomatoes, eggplant, potatoes, peppers) for at least 2 seasons; NC State Extension's organic management guidance specifically recommends rotation for breaking soilborne disease cycles in the nightshade family
Plants wilting fast and collapsing at the crown — stem near the soil line looks dark and water-soaked, roots brown and mushy
Likely Causes
- Phytophthora blight (Phytophthora capsici) — a water mold that explodes in poorly drained or waterlogged soil during warm weather
- Low spots in the bed that pool after heavy rain
What to Do
- 1.Pull and trash infected plants immediately — Phytophthora moves through water, so don't let runoff carry it downhill to healthy plants
- 2.Don't replant peppers or any other nightshade in that spot for at least 3 years
- 3.Raise beds or improve drainage before next season; this pathogen is nearly impossible to suppress once it's established in wet soil
Frequently Asked Questions
How long does Poblano Tiburon take to grow from seed?▼
Can you grow Poblano Tiburon in containers?▼
What does Poblano Tiburon taste like compared to regular poblanos?▼
Is Poblano Tiburon good for beginners?▼
When should I plant Poblano Tiburon seeds?▼
Can Poblano Tiburon peppers be dried into ancho chiles?▼
Growing Guides from Wind River Greens
Where to Buy Seeds
Sources & References
External authority sources used in compiling this guide.
See the Methodology page for how this data is sourced, what's AI-assisted, and known limitations.
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