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Producing a diverse set of high-quality crops is a keystone component to the success and sustainability of many small and medium-sized New Hampshire farms. Another component is informed decision-making for capturing new marketing opportunities, such as the 鈥攁 colorful and bitter leafy vegetable popular in Italian cuisine鈥攁mong restaurants and retailers in New England. With a potential for spring and late-fall production, average sales prices of $3鈥�$6 per head and high levels , Granite State farmers may be deciding whether to add radicchio to their crop mix. Scientists with the (NHAES) are aiding this decision through their research examining which radicchio varieties perform best in northern New England's varied climate and how planting date impacts performance of this increasingly popular and valuable crop.

鈥淩adicchio is becoming very trendy among chefs and local foodies so there鈥檚 been an explosion of interest in the crop,鈥� said Station scientist . 鈥淗owever, it鈥檚 been little studied, especially in the Northeast, and it鈥檚 a crop that鈥檚 highly variable and easily impacted by weather and climate. It鈥檚 performance here may be very different from where it is more commonly grown commercially, in the Pacific Northwest.鈥�

鈥淏ecause of all these factors,鈥� she added, 鈥渋t鈥檚 challenging for a farmer in New England just to begin growing it without information on best-performing varieties and ideal growing conditions 鈥� making it an ideal crop to study.鈥�

鈥淲ithin this part of the country, farmers often use to distinguish themselves from other farms and the offerings in grocery stores. And as they become known for producing high quality products as signature offerings, this also benefits consumers, who gain access to unique local specialties.鈥� ~ Becky Sideman, professor of听agriculture, nutrition and food systems

The was led by Sideman, professor of agriculture, nutrition and food systems at UNH鈥檚 (COLSA), with support from COLSA research scientist and undergraduate researcher . In addition to conducting the study at UNH鈥檚 , the team鈥檚 partners at the University of Maine conducted the same study at . Together, they grew and observed over 30 cultivars of radicchio and examined how planting date impacted the weight and marketability of the radicchio heads.

The study identified the Chioggia type and varieties as having high marketability and resilience to disease鈥攎aking them ideal choices for New England farmers. The data also indicated that planting radicchio in the third week of June maximized the harvest window, which may allow growers to simplify harvest operations.

The Chioggia type is the one most familiar to most U.S. consumers, with heads that are solid, round and frequently red (depending on variety). In this study, several Chioggia type varieties鈥� including Indigo, Leonardo, and Perseo鈥攅xperienced relatively little bolting and and consistently produced over 80 percent of marketable heads. Radicchio varieties within the Treviso type, which forms heads shaped like romaine hearts, frequently showed susceptibility to bolting, but the variety Caravaggio stood out for its bolt resistance in both 2022 and 2023. Virtus was a high performing variety within the Sugarloaf type, producing large, uniform heads. Varieties of Rosa del Veneto and Castelfranco types were also tested and showed greater variation.

鈥淪o far, we鈥檝e seen huge differences in marketability among varieties, due to varying degrees of susceptibility to issues like bolting, tip burn and rotting,鈥� described Hartman. 鈥淎nd we鈥檝e observed that some varieties just don鈥檛 have enough time at their preferred temperatures to mature during our rather short growing season.鈥�

Because the study took place over an unusually dry 2022 growing season and a wetter-than-average 2023 season, the research team was able to observe how varieties responded to very different challenges commonly experienced by radicchio growers, including rot, bolting (or premature flowering) and tip burn, a disorder that leads to browning leaves and dead leaf tips.

The team observed that some varieties were affected more than others by the seasonal variation. Added Sideman, 鈥淲e observed more bolting in 2022, and more rot in 2023 鈥� as you鈥檇 expect given the weather conditions. And it was exciting to see that some varieties produced quite good yields in both years.鈥�

The research team plans to conduct further experiments in 2024 and beyond to address additional questions, such as how the rate and timing of nitrogen application affects marketable yields and how cold temperature exposure and maturity at harvest impact color development and post-harvest storage. This ongoing research is part of a broader project led by Sideman and supported by the NHAES examining several varieties of , including seedless table grapes and hydrangeas for regional cut-flower markets, as well as production systems and practices for and overwintering of strawberries and .

鈥淲ithin this part of the country, farmers often use specialty crops to distinguish themselves from other farms and the offerings in grocery stores,鈥� said Sideman. 鈥淎nd as they become known for producing high quality products as signature offerings, this also benefits consumers, who gain access to unique local specialties.鈥�

This material is based on work supported by the NH Agricultural Experiment Station through joint funding from the (under Hatch award numbers 7003420) and the state of New Hampshire. Additional support came from the and the .