What Do Coffee Cherries and Beans Look Like?

If you’ve ever wondered what a coffee cherry actually looks like—before it becomes your morning roast—you’re not alone. Most coffee drinkers never see the fruit that grows on the tree, let alone watch it develop from flower to mature seed. So what does a coffee cherry really look like, and how does it turn into the green beans we roast?

Coffee cherries start out about the size of a match head right after the flower falls off. Over 6 to 8 months, they grow to full size: around 1.5 to 2 cm long and 1 to 1.5 cm in diameter for Arabica, slightly smaller for Robusta. That’s the fruit you’ve never seen—until now.

What Is a Coffee Cherry?

A coffee cherry is the fruit of the coffee plant. It’s oval-shaped and starts extremely small, about the size of a match head, immediately after the coffee flower drops. Over a growth period of 6 to 8 months, depending on variety and growing conditions, it matures into the fruit we call a coffee cherry. Arabica cherries typically reach 1.5 to 2 cm in length with a cross-section diameter of 1 to 1.5 cm, while Robusta cherries are somewhat smaller.

From Flower to Fruit: How Coffee Cherries Develop

Right after the coffee plant flowers, a tiny fruit begins to form. Initially, it’s barely visible—about the size of a match head. Over the next 6 to 8 months, environmental factors and cultivation conditions influence how large the cherry grows by harvest time. In optimal settings, especially for Arabica, the coffee cherry can reach 1.5–2 cm long with a diameter of 1–1.5 cm.

What’s Inside a Coffee Cherry?

When a coffee cherry is ripe, its outer flesh becomes soft and sweet. Though the fruit layer isn’t thick, many pickers—especially kids helping during harvest—enjoy eating it straight from the branch. Under the fruit are the seeds, each protected by layers. The innermost protective layer is called the parchment (or ""), and surrounding that is a sticky substance known as mucilage or fruit gel. To get to the green coffee bean, all of these—fruit, mucilage, and parchment—must be removed.

Flat Beans vs. Peaberry Beans

Most coffee cherries contain two seeds that develop flat sides facing each other, which is why we call them “flat beans” . But in 5% to 20% of cases, a cherry produces just one round seed instead of two. This happens due to uneven fertilization or environmental stress, and the single seed develops without a flat side—resulting in what’s called a “peaberry” or “”. These round beans are sorted out during processing since they’re much less common and are sometimes sold separately, often at a premium. They’re especially noted in regions like Brazil and Blue Mountain, but their occurrence reduces overall yield per cherry for farmers.

Anatomy of a Coffee Cherry and Bean

The entire coffee cherry includes several layers: the outer skin (exocarp), the fleshy middle (mesocarp), the mucilage (sticky gel layer), the inner skin (endocarp or parchment layer), the silvery film (silver skin), and finally the seed itself, which consists of the endosperm (including the cotyledons or inner embryonic leaves), embryo axis, and radical. The green coffee bean you roast is technically the seed inside all those layers—with the parchment and silver skin still attached in some processing methods.

Frequently Asked Questions

What does a coffee cherry look like when it first forms?

Right after the coffee flower falls off, the coffee cherry starts out about the size of a match head. It’s very small and grows over the next 6 to 8 months into its full size, which is around 1.5 to 2 cm long and 1 to 1.5 cm in diameter for Arabica beans.

How big is a fully grown coffee cherry?

An Arabica coffee cherry typically reaches 1.5 to 2 cm in length and 1 to 1.5 cm in diameter at maturity. Robusta cherries are slightly smaller. Size can vary based on growing conditions and variety.

What are flat beans in coffee?

Flat beans are the typical coffee seeds found inside a cherry—there are usually two per fruit, and each has a flat side where they touch each other. These are the standard beans used in most coffee production.

What is a peaberry coffee bean?

A peaberry, or , is a single round coffee seed that forms inside a cherry when only one seed develops, instead of the usual two. This occurs in 5% to 20% of cherries due to uneven fertilization or environmental factors, making peaberries rare and often sold separately.

What are the layers of a coffee cherry?

A coffee cherry has multiple layers: the outer skin (exocarp), fleshy fruit (mesocarp), mucilage (sticky layer), inner skin (endocarp or parchment), silver skin, and the coffee seed (which includes the endosperm, embryo, and other internal structures).

Why are peaberry beans separated during processing?

Peaberry beans are separated because they are round rather than flat, occurring when only one seed develops in the cherry. They are less common (5–20% of cherries) and are often sold separately, sometimes at a higher price, due to their rarity.

FrontStreet Coffee Beans That Start as Cherries

Explore the origins of your coffee with FrontStreet’s single-origin offerings that begin life as cherries on a tree. Try the Ethiopia Yirgacheffe for bright floral and citrus notes from high-altitude cherries, or the Colombia Huila for balanced caramel and berry tones. For something more chocolatey and bold, the Sumatra Mandheling offers earthy depth. All these beans begin as coffee cherries that grow, ripen, and are carefully processed into the green beans we roast. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.