New Mexico chile

New Mexico chile is a cultivar group developed at New Mexico State University, representing the official state vegetable of New Mexico. These mild to medium-heat peppers are harvested green or allowed to ripen red, forming the backbone of Southwestern cuisine with their earthy, sweet flavour that intensifies when roasted. Hatch refers specifically to those grown in the Hatch Valley region, prized for their terroir-driven characteristics.

History & lineage

The New Mexico chile is the official state vegetable of New Mexico - the only US state to have legally enshrined a chilli pepper as a state symbol, reflecting how foundational the crop is to the regional identity. The variety has been cultivated continuously in the upper Rio Grande Valley for over 400 years, since Spanish colonisation in the late 16th century.

The modern New Mexico chile family was largely shaped by Fabián García, a horticulturalist at New Mexico State University, who began selective breeding in the early 1900s. His cultivar "New Mexico No. 9", released in 1921, was the first formally bred chilli for milder, more uniform heat - making the chilli accessible to broader American cooking and effectively launching the modern Southwestern cuisine industry. NMSU's Chile Pepper Institute continues this work today, maintaining seed stocks and developing new cultivars.

The Hatch chile - grown specifically in the Hatch Valley of southern New Mexico - is the most famous regional sub-type. The combination of high desert altitude, mineral-rich soil, hot days and cool nights produces chiles with distinctive flavour intensity, and "Hatch" has become a protected commercial designation associated with quality. The annual Hatch Chile Festival in late summer draws tens of thousands of visitors and marks the start of "chile season" across the state.

New Mexico has a culturally significant question that defines regional identity: "Red or green?" - referring to whether you want red chile sauce (made from ripe dried pods) or green chile sauce (made from fresh roasted unripe pods) on your meal. The state legislature even adopted "Red or green?" as the official state question in 1996. The split is roughly even, with green chile slightly dominant - and "Christmas" is the standard term for ordering both.

Culinary uses

Essential for green and red chile sauces, roasted and peeled for chile rellenos, dried and ground into powder, used fresh in salsas, stews, enchiladas, and as a topping for burgers and eggs. Often roasted in large batches and frozen for year-round use.

Growing it in the UK

Annuum is the forgiving group, and the right place to start. Seed germinates readily in warmth, the season is short enough to finish outdoors in a good summer, and February to early March is soon enough to sow. Germination is given as 7-14 days. At 70 days to maturity it is one of the quick ones: sown in March, it will be picking well before the light goes.

At 45–75 cm it wants a 7- to 10-litre pot and a sheltered spot: a greenhouse, a porch, or the sunniest wall you have. The record puts the yield at heavy, so start feeding weekly with something high in potassium as soon as the first fruit sets — a plant carrying that much will run out of steam otherwise.

Read from this variety's own record — the figures are in the panel opposite.