Conventionally grown refers to food produced using standard modern agricultural practices, including synthetic fertilizers, chemical pesticides, genetically modified seeds, and mechanized irrigation. It is the default method for the vast majority of food sold in grocery stores. If a product doesn’t carry a USDA Organic seal or any other specialty label, it was almost certainly conventionally grown.
How Conventional Farming Works
Conventional agriculture relies on manufactured chemical inputs to maximize crop yields. The foundation is synthetic fertilizer, which delivers three key nutrients directly to the soil: nitrogen, phosphorus, and potassium (often abbreviated as N-P-K on fertilizer labels). Urea pellets, for example, contain 46% nitrogen and are among the most concentrated options available. Other common forms include ammonium nitrate, diammonium phosphate, and potassium nitrate. These products are engineered to release nutrients quickly so plants can absorb them during critical growth stages, which is a fundamentally different approach from organic farming, where nutrients come from composted manure, bone meal, or other natural sources that break down more slowly.
Pest and weed control in conventional systems depends heavily on synthetic chemicals. Glyphosate and atrazine are the two most widely applied herbicides on U.S. agricultural land, covering more than double the acreage of the next most common herbicide, 2,4-D. Glyphosate works by blocking a plant’s ability to produce certain amino acids, effectively starving weeds at the cellular level. Atrazine, commonly used on corn and sorghum, is absorbed through the soil and shuts down photosynthesis in broadleaf weeds. Insecticides and fungicides round out the chemical toolkit, targeting specific threats depending on the crop and region.
The Role of Genetically Modified Seeds
Genetically engineered (GE) seeds are a defining feature of conventional farming in the United States. More than 90% of U.S. corn, upland cotton, and soybeans are now grown from GE varieties. Soybean adoption is the highest at 96% of all planted acres in 2025. These seeds are engineered for two main traits: herbicide tolerance, which lets farmers spray weed killers without harming the crop, and insect resistance, which causes the plant itself to produce proteins toxic to certain pests. About 87% of cotton acres and 84% of corn acres use “stacked” seeds that combine both traits in a single variety. GE seeds are also widely used in alfalfa, canola, and sugar beet production.
This widespread adoption means that most conventionally grown corn, soy, and cotton-derived ingredients in processed foods originate from genetically modified plants, even when the packaging doesn’t explicitly say so.
Water Use and Scale
Conventional farms tend to operate at large scale, often growing a single crop across hundreds or thousands of acres. This monoculture approach simplifies planting and harvesting with heavy machinery but requires significant water resources. Irrigation accounts for more than 40% of all freshwater use in the United States, consuming an estimated 20 to 30 trillion gallons in 2015 alone. Common irrigation methods range from gravity-fed flood systems, where water simply runs down furrows between crop rows, to sprinkler systems and more efficient micro-irrigation that delivers water directly near plant roots. Increasingly, conventional operations use precision tools like soil moisture sensors and smartphone-based scheduling to reduce water waste, though gravity systems remain widespread.
Yield Advantages Over Organic
The primary reason conventional methods dominate global agriculture is productivity. A large meta-analysis comparing the two systems found that organic farming yields are 18.4% lower than conventional yields on average, regardless of climate, crop type, or growing conditions. In warm temperate climates, the gap widens to about 21%. Even under the best organic management practices, yields still trail conventional systems by roughly 13%.
Organic farming also shows about 15% less yield stability from year to year, meaning harvests fluctuate more between good and bad seasons. These differences in output are the core reason conventional food is generally less expensive at the store. The synthetic inputs cost money, but they produce more food per acre, which drives down the price per pound.
Effects on Soil and Ecosystems
The tradeoff for higher yields is measurable environmental impact. Conventional tillage, where machinery physically turns over the top layer of soil before planting, disrupts soil structure and harms the organisms living in it. Research comparing conventional fields managed with deep tillage to untilled land has found that conventional plots consistently have lower populations of soil organisms, poorer soil quality, and reduced overall soil function. Over time, repeated tilling and reliance on synthetic fertilizers rather than organic matter can deplete the soil’s natural carbon stores and reduce its ability to hold water.
Monoculture compounds these effects. Growing the same crop on the same land year after year reduces the diversity of microbes and insects in the soil, which can make the system more dependent on chemical inputs to stay productive. Many conventional farmers now incorporate conservation practices like cover cropping or reduced tillage to mitigate some of this damage, though these techniques are not yet universal.
Pesticide Residues on Conventional Produce
One of the most common concerns about conventionally grown food is pesticide residue. The USDA’s Pesticide Data Program tests thousands of food samples each year, and its 2024 report found that more than 99% of samples had residues below the safety benchmarks set by the EPA. That means detectable residues are common on conventional produce, but they rarely approach levels considered harmful. The EPA sets these tolerance levels with wide safety margins built in, accounting for lifetime consumption patterns including children’s diets.
Washing and peeling conventional fruits and vegetables further reduces residue levels, though it doesn’t eliminate them entirely. Some shoppers use guides like the Environmental Working Group’s “Dirty Dozen” list to decide which items are worth buying organic and which conventional options they’re comfortable with.
How to Tell if Something Is Conventionally Grown
There is no “conventional” certification or label. Conventional is simply the absence of an organic or other specialty designation. The USDA maintains a rigorous labeling system for organic products: items labeled “100 Percent Organic” or “Organic” can carry the USDA Organic seal, while products “Made with Organic” ingredients follow separate, stricter rules about what they can and cannot claim on the package. Any product that doesn’t meet these certified organic standards and doesn’t display the seal was produced conventionally.
At the grocery store, you can also check the PLU sticker on fresh produce. Conventionally grown items carry a four-digit code (like 4011 for bananas), while organic versions of the same item have a five-digit code starting with 9 (94011 for organic bananas). If there’s no sticker at all, the item is almost always conventional.