Walk past a summer field and you might swear you see corn, but the plant is something else. Sorghum is the crop that looks like corn most often, though a few others fool people too.

Sorghum, also called milo, is the crop that looks like corn more than any other plant. Both are tall grasses with broad leaves and thick stalks. Sugarcane, sudangrass, pearl millet, and Johnsongrass also resemble corn.

What Is the Crop That Looks Like Corn?

Sorghum looks the most like corn, no contest. Both plants belong to the grass family, Poaceae, and both grow as tall summer annuals with broad, flat leaves and a thick central stalk. Stand at the edge of a young field and the two can look identical. Because farmers here in Kansas grow so much grain sorghum, I see this mix-up every June.

Sorghum also goes by another name you hear at the co-op: milo. Milo is simply grain sorghum, the type grown for its seed head. If you want the full rundown on milo and grain sorghum, the two names point to the same crop.

The clearest difference shows up at the top of the plant. Corn makes an ear wrapped in a husk, plus a tassel above it. Sorghum, by contrast, makes an open, branching seed head called a panicle. That reddish-brown head is the feature most people picture when they think about the look of a mature sorghum head. Once the heads form, nobody confuses the two. Before that, though, they trick plenty of folks.

Other Crops That Resemble Corn

Several field crops share corn’s tall, grassy build. Most sit in the same plant family, so the resemblance runs deep.

Sudangrass and Sorghum-Sudangrass

Sudangrass looks like a slimmer version of sorghum, which puts it close to corn too. The stems run about a quarter inch thick, and mature plants stand 4 to 7 feet tall, shorter than field corn. Growers plant it mainly for forage. When you cut it for hay, timing matters, so I walk through cutting sorghum-sudangrass for hay in its own guide. The hybrid, sorghum-sudangrass, lands between plain sudangrass and full sorghum in size.

Broomcorn

Broomcorn is a type of sorghum, not corn at all, despite the name. It grows tall with the same broad leaves. Instead of a grain panicle, it makes long, stiff bristles once used for broom-making. From a distance, a broomcorn plant reads as corn or sorghum.

Pearl Millet

Pearl millet has corn-like leaves and an upright stalk, so young plants blend right into a cornfield. The seed head gives it away. Rather than an ear or a branching panicle, pearl millet forms a single, dense, cattail-shaped spike. Farmers grow it as a summer forage and cover crop, mostly across the southern states.

Sugarcane

Sugarcane is a giant grass that reads as oversized corn from the roadside. The stalks grow thick and jointed, far taller than corn, and they end in a feathery plume instead of an ear. Most U.S. sugarcane grows in Florida, Louisiana, and Texas. For more on sugarcane as a crop and where it fits, I cover it separately.

Weeds That Look Like Young Corn

Two weeds fool farmers every spring because their seedlings copy young corn and sorghum almost exactly.

Johnsongrass

Johnsongrass is the most common corn look-alike weed, and it belongs to the sorghum family, which explains the match. Young shoots stand upright with broad leaves, just like corn. One feature sets it apart: a thick white midvein running down the center of each leaf. Pull the plant and you find rhizomes, thick underground stems that spread fast. Since corn does not make rhizomes, finding them settles the question.

Shattercane

Shattercane is an annual grass that looks like Johnsongrass and grain sorghum. The big difference is underground. Shattercane grows from seed only and makes no rhizomes. That single trait changes how you fight it, because a seed-only weed rebuilds slower than one spreading by roots.

Look-Alikes That Are Not Farm Crops

A few non-crop plants also pass for corn at a glance.

Teosinte is the wild ancestor of corn, so naturally it looks corn-like. It even makes small tassels and tiny ear-like spikes. Those ears run far smaller than modern corn, with just a few hard seeds. You will rarely spot it outside a research plot.

Giant miscanthus and giant reed are tall ornamental grasses. Miscanthus can reach 12 feet and ends in feathery plumes, while giant reed has hollow, bamboo-like stems. Both land in corn’s height range from a distance.

Then there is the houseplant sold as a “corn plant,” Dracaena fragrans. Its woody stem and arching leaves resemble a corn stalk, which earned the nickname. You will find it in living rooms, not fields.

How to Tell Corn Apart From Sorghum and the Others

The fastest test is the leaf edge. Run a fingertip along the margin of a leaf. Corn feels smooth. Sorghum and Johnsongrass feel rough and serrated, like a fine saw blade grabbing your skin. The United Sorghum Checkoff calls this one of the best ways to separate the two, and it holds at every growth stage.

A few more checks confirm it quickly.

First, look at the very first leaf near the base. Corn’s first leaf is large and oval. Sorghum’s first leaf is small with a rounded tip, a point that both Texas A&M AgriLife and K-State Research and Extension use for seedling ID.

Next, count the stalks. Corn usually grows one main stalk per plant. Sorghum, on the other hand, tillers freely, sending up several shoots from the base within a couple weeks of emergence.

Then check the base for brace roots. Corn pushes out brace roots, the short prop roots at the soil line. Sorghum and most look-alikes skip them, according to USDA NRCS plant guides.

After that, read the seed head. An ear in a husk with a tassel means corn. A branching panicle means sorghum. A cattail spike means pearl millet. A feathery plume means sugarcane or miscanthus.

Finally, dig for rhizomes. Thick, horizontal underground stems point to Johnsongrass, not corn or shattercane.

Why So Many Plants Look Like Corn

Corn shares its family tree with these look-alikes, which is exactly why they match up. Corn, sorghum, sugarcane, pearl millet, and Johnsongrass are all C4 grasses in the Poaceae family. C4 grasses thrive in summer heat, so they evolved similar tall, broad-leaved builds to grab sunlight fast. Corn’s scientific name is Zea mays, sorghum is Sorghum bicolor, and Johnsongrass is Sorghum halepense, close cousins on the same branch. Shared genetics means shared looks.

Bottom Lines

When a plant stumps me, I go straight for the leaf edge. Rough and serrated means sorghum or Johnsongrass, while smooth means corn. Then I glance at the base for tillers and brace roots, and I check the seed head if one has formed. Nine times out of ten, the leaf test alone gives me my answer before I even bend down.