There is a reason a tomato plucked from the plant in July tastes nothing like the pale slice sitting on your sandwich in January.

Tomatoes are one of the most scientifically fascinating fruits we grow, and summer in North Carolina is when all the right conditions converge to produce something genuinely extraordinary. Understanding a little of the science behind tomato flavor can make you a better gardener and a more sophisticated eater.

Flavor is the result of hundreds of volatile aromatic compounds working alongside sugars and acids to create what scientists call a flavor profile. The sweetness in a ripe tomato is measured by something called Brix, a scale of sugar concentration. Most grocery store tomatoes score around 4 to 5 on that scale. A well-grown heirloom at peak ripeness can reach 7 or higher, with cherry varieties scoring even higher. However, sugar concentration isn't solely responsible for a good tasting tomato. The balance between sugar and acid is what creates that bright, complex flavor we associate with a perfect summer tomato.

Home gardeners have a significant advantage by allowing tomatoes to ripen directly on the plant. Commercial tomatoes are typically harvested green and often exposed to ethylene gas to trigger ripening and a color change during transport. Refrigeration during shipping compounds the problem further, suppressing the development of aromatic volatile compounds. That is why a store-bought tomato can look beautiful and taste like almost nothing. When you let a tomato ripen naturally in your garden, those volatiles develop fully.

Soil health, watering consistency, and variety selection also drive flavor. Tomatoes that experience water stress at the wrong moment lose both flavor and texture. Deeply amended, well-draining soil and consistent moisture are your best tools. Variety matters enormously too. Modern hybrid varieties have largely been bred for yield, shelf life, and uniformity. Heirlooms and regionally adapted varieties like Cherokee Purple, Mortgage Lifter, and locally sourced cultivars from Cape Fear area farms tend to prioritize flavor over everything else.

North Carolina ranks among the top ten tomato-producing states in the nation, and growers here have deep knowledge of what varieties perform best in our warm summers and variable soils. That expertise shows up at farmers markets and farm stands across the region every July.

If you want to taste the difference firsthand, join us for the Community Tomato Tasting at the Wilmington Farmers Market, 5329 Oleander Drive, on Saturday, July 11, from 8 to 11 a.m. The event is free and open to the public. You will sample varieties from local farms including Farmage, Red Beard Farms, Terra Vita Farm, and Black River Organic Farm, alongside pairings from Little Loaf Bakery, Sea Love Sea Salt, and Raw Salsa NC. This is food literacy you can taste!

Gabriella de Souza, M.S. is the Consumer Horticulture Agent and Extension Master Gardener Program Coordinator for N.C. Cooperative Extension, New Hanover County Center and Arboretum. She can be reached at gadesouz@ncsu.edu.