What Does a Small Coffee Tree (Yunnan Arabica) Look Like?

If you’ve ever wondered what a Yunnan-grown small Arabica coffee tree really looks like—down to its roots, flowers, and fruit—you’re not alone. Growers, roasters, and curious drinkers all want the specifics: How deep do the roots go? What do the leaves look like? When does it flower? And how long until the cherries ripen? This guide answers those questions with exact measurements and clear detail.

Yunnan’s small Arabica coffee tree (also known as Typica or ‘small grain’ variety) has shallow roots (main taproot ~70cm deep after 3–4 years), short internodes (4–7cm), small oval leaves (12–16cm × 5–7cm), clusters of white aromatic flowers, and elliptical berries (9–14mm) that take 8–13 months to mature depending on the variety.

The Root System of a Small Coffee Tree

Coffee is a shallow-rooted plant. Seed-grown coffee trees develop a conical root system. Among varieties, small and medium grains have shallower roots while large grains grow deeper. In Yunnan, a 3–4 year old bearing small Arabica tree has a main taproot that extends roughly 70cm downward. From this main root grow lateral roots—some horizontal, others vertical. Secondary and tertiary roots branch further. The root zone shows distinct layers, typically spaced 5cm apart, with most absorptive roots concentrated in the top 0–30cm of soil. The root system also regenerates well after damage.

The Stem and Growth Pattern

The stem grows upright. Young stems are slightly square and green, turning round and brown (lignified) with age. On small Arabica trees, internodes measure 4–7cm, and each node bears a pair of leaves with axillary buds—upper (developing into lateral branches) and lower (forming vertical shoots)—which sprout simultaneously. The main trunk exhibits strong apical dominance: upper branches grow more vigorously, though this weakens as the tree ages. Without pruning, small Arabica can reach 4–6m, medium 6–8m, and large grains over 10m. Trunk growth varies seasonally: minimal in dry or winter periods (shorter internodes), more vigorous in rainy seasons (longer internodes). Branches are classified as primary, secondary, tertiary, secondary lateral, or vertical shoots.

Leaves: Shape, Size, and Structure

Coffee leaves grow oppositely in two rows, though some plants may show alternate or spiral arrangements. The petiole is short. Leaves are leathery, glossy, and green, shaped elliptical to oblong. Small Arabica leaves are notably uniform in size: approximately 12–16cm long and 5–7cm wide, with a distinctly pointed tip and wavy leaf margins. The leaf structure is dorsiventral (belly-side and back-side asymmetry typical of coffee). These leaves contain tannins, starch granules, and calcium oxalate crystals.

Flowers: Blooming Habits and Anatomy

Coffee flowers appear in clusters of several to dozens, each born on a short stalk arising from leaf axils. Typically 2–5 flowers sit along a single flower axis. Flowers are white, fragrant, and have five petals (in small and medium varieties). The petals join at the base to form a tubular, high-footed butterfly-like corolla. Stamens usually match the petal count and attach around the throat of the corolla. Each anther has two pollen sacs, positioned at either end of the filament to form a “T” shape. The pistil features a long, thread-like style, a two-lobed stigma, and a inferior ovary with typically two locules. Each locule holds a single anatropous ovule on a short funiculus. Coffee is an insect-pollinated short-day plant, though small and large grains can self-pollinate, while medium grains often cross-pollinate. Flowering occurs multiple times with intense seasonal bursts. In Yunnan’s Dehong region, small Arabica flowers from February to July, peaking March to May. Blooms last just 2–3 days, opening around 3–5 AM and fully expanding by 5–7 AM. Flowering is highly sensitive to rainfall and temperature.

Fruit Development and Ripening

The coffee fruit is a drupe (berry), elliptical in shape, measuring 9–14mm in length. Unripe fruits are green, turning red or purplish-red when mature. Each berry typically contains two seeds, semi-elliptical with a longitudinal groove called the ventral furrow. Fruit development takes considerable time: small Arabica needs 8–10 months (maturing October–December of the same year), medium 10–12 months (ripening November–May the following year), and large grains 12–13 months. Rainfall significantly affects fruit growth, with climate directly determining development outcomes.

Frequently Asked Questions

How deep are the roots of a small coffee tree after a few years?

A 3–4 year old bearing small Arabica coffee tree in Yunnan develops a main taproot that reaches approximately 70cm in depth. Lateral roots spread both horizontally and vertically, with most absorbing roots located in the top 0–30cm of soil.

What do the leaves of a small coffee tree look like?

Small Arabica coffee leaves are oval to oblong, leathery, glossy, and green. They typically measure 12–16cm in length and 5–7cm in width, with a pointed tip and distinct wavy leaf margins. The leaves are arranged oppositely along the stem.

When does the small Arabica coffee tree flower in Yunnan?

In Yunnan’s Dehong region, small Arabica coffee trees flower from February to July, with the peak blooming period occurring between March and May. Individual flowers last only 2–3 days, opening around 3–5 AM and fully blooming by 5–7 AM.

How long does it take for small coffee tree fruit to ripen?

Small Arabica coffee cherries take 8–10 months to mature, typically ripening between October and December of the same year. Medium varieties take 10–12 months (November–May), while large grains require 12–13 months.

What kind of flowers does a small coffee tree produce?

Small Arabica trees produce clusters of white, fragrant, star-shaped flowers with five petals that form a high-footed butterfly-like corolla. Each flower sits in the leaf axil, usually 2–5 per axis, and blooms for just 2–3 days.

Are small coffee tree fruits easy to grow?

Growing small coffee tree fruits requires specific conditions. The berries take 8–10 months (small), 10–12 months (medium), or 12–13 months (large) to mature, with development highly dependent on consistent rainfall and favorable temperatures throughout the growing cycle.

Recommended FrontStreet Beans for Exploring Small Coffee Trees

Start with FrontStreet Coffee’s Yunnan Arabica, a washed, medium-roasted single origin that highlights the classic profile of small Arabica beans: soft nuttiness, mild chocolate tones, and a touch of bright plum acidity. For a deeper dive, try the 2013 Typica, a sun-dried lot made from Yunnan’s original coffee variety, offering balanced acidity, dark berry notes, and a sweet caramel finish. Both beans trace directly to the region and variety discussed in this article. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.