CoffeariumBeta
  1. Plant
  2. Farm
  3. Process
  4. Trade
  5. Roast
  6. Brew
  7. Cup
Botany · Physiology

Branching and fruiting wood

How a coffee plant is built – one upright stem, pairs of horizontal side branches – and why its flowers and fruit form on young wood, so that the crop moves up and out every year.

Across the chain: Science

Source-checkedby Coffearium verification pass· Last source-checked 22 Oct 2026· Prepared with AI assistance· 11 sources (11 tier A)· 2 contested· Updated 22 Oct 2026
Reading depth
Contents
  • A coffee plant has two kinds of shoot: an upright (orthotropic) stem and horizontal (plagiotropic) branches; the split is highly fixed in the genus.1,5
  • Flowers grow from rows of serial buds in the leaf axils of the side branches, usually 4–5 buds per axil.4,6
  • Arabica fruits on branch wood about one year old, typically only once per node.4,1
  • The main fruiting zone therefore moves up the stem and out along the branches each year.3,4
  • A stem node forms its pair of primary branches only once, according to Colombia’s coffee research centre.3

Two kinds of shoot#

A coffee plant grows two kinds of shoot. The stem grows upright; botanists call this growth orthotropic.5 The side branches grow out roughly horizontally; this growth is called plagiotropic.5 The difference is highly fixed throughout the coffee genus.1

The stem is built from repeated units. Each unit is a node with two opposite leaves, the internode below it, and 4–5 buds, in a row at each leaf base.5,2 Each new leaf pair sits at right angles to the one below.5 In Colombia, the stem adds a new node about every 25–30 days, according to the national coffee research centre, Cenicafé.2

At each stem node, one pair of side branches grows out, one on each side.2 These are the primary branches. In Colombia a plant forms about 12–14 pairs of them in a year.2 Branches that grow from the primaries are secondary branches, and so on to higher orders.5,2

A413982567B111210
  1. Stem (orthotropic): the upright main axis, with opposite leaves.5
  2. Primary branch (plagiotropic): one pair at each stem node, each pair at right angles to the next.2,5
  3. Node and internode: on the stem, a new node about every 25–30 days in Colombia.2
  4. Shoot apex: forms the new nodes and leaves and drives growth in height.2
  5. Bare inner wood: nodes that have already fruited; they typically do not fruit again.4
  6. Fruiting wood: branch wood grown the season before, with fruit in the leaf axils.3,4
  7. New growth: this season’s nodes and leaves, next year’s fruiting wood.3
  8. Secondary branch: grows from a serial bud on a primary branch.1,2
  9. Sucker: an upright shoot from a latent bud on the stem.2,3
  10. Leaf pair: two opposite leaves at each node.2
  11. Serial buds: 4–5 buds in a row in each leaf axil.6
  12. Inflorescences: short flower clusters that grow from serial buds, usually 4–5 flowers each.4
The architecture of an arabica coffee plant (A) and one node of a primary branch (B). Point at a part, its number or its name to highlight it. Schematic, not to scale.

Buds in a row#

At each leaf base, called the leaf axil, the buds sit in a short row, one above the other. They are called serial buds.6,4 What each bud becomes depends on where it sits.

On the stem, the first and oldest bud of each row forms a primary branch.2 It does this only once, according to Cenicafé.3 The next bud can form an upright shoot, called a sucker. The others stay dormant or, now and then, form flowers on the stem itself.2 Suckers grow when something limits or interrupts the dominance of the stem tip.3

On the side branches, the buds can form new side branches, flowers, or nothing.1,6 Buds on a branch only ever give more branch-type, horizontal growth, Cenicafé notes; that is the basis of how a plant responds to pruning.3

Where the fruit forms#

Coffee flowers in clusters from the serial buds in the leaf axils of the side branches. Each cluster, an inflorescence, usually has 4–5 flowers.4 Flowers can also appear on the stem.4

Arabica bears its crop on young wood. It fruits on branch wood about one year old, and typically only once at each node.4,2 A 2007 review puts it the same way: arabica bears flowers only on the previous season’s branches.1 How a flower bud forms and opens is covered in Flowering and pollination; how the fruit grows, in Fruit development.

So one branch does two jobs in the same year. Near its tip it grows new nodes and leaves. Further in, on last year’s wood, it carries flowers and fruit.3,4 The two kinds of growth compete. After a heavy crop the plants grow little, so the next crop is smaller; this is one cause of alternate bearing.3

012345678CountBuds per leaf axil,lateral branch(Brazil, 2005 study)4–56 Buds per leaf axil, stem(Cenicafé, Colombia)4–52 Serial buds that giveinflorescences(2025 review)3–54 Inflorescences per leafaxil(Cenicafé)3–42 Flowers per inflorescence(2025 review)4–54 Flowers per inflorescence(Cenicafé)4–6; 4–5 elsewhere in the chapter2
Data table
CountSource
Buds per leaf axil, lateral branch (Brazil, 2005 study)4–56
Buds per leaf axil, stem (Cenicafé, Colombia)4–52
Serial buds that give inflorescences (2025 review)3–54
Inflorescences per leaf axil (Cenicafé)3–42
Flowers per inflorescence (2025 review)4–54
Flowers per inflorescence (Cenicafé)4–6; 4–5 elsewhere in the chapter2
Buds, inflorescences and flowers at one leaf axil of C. arabica, as reported by a 2005 Brazilian study, Cenicafé and a 2025 review. Counts are typical ranges, not limits.6,2,4

Why the crop moves out#

Because each node fruits about once, the crop has to move. Every year the main fruiting zone shifts up the stem and outwards along the branches.3,4 Over time the fruit ends up at the edges and top of the plant, where pickers find it hard to reach.3 The plant’s yield also falls as it ages.3

Shade within the plant adds to this. When plants shade themselves, the internodes grow longer, so a branch carries fewer fruiting nodes.8 Closer spacing kills more of the lower side branches.8 That is why farms prune, cut plants back to a stump and renew them in cycles. The practice belongs to the Farm stage and is covered in the planned entry Pruning, stumping and renovation.3

Arabica and canephora#

C. arabica is a small tree 2–8 m tall.9 C. canephora, the species grown as robusta, is a small tree up to 12 m tall.10 Arabica is generally less vigorous than robusta.1

The two are often grown in different shapes. In Brazil, conilon (a type of C. canephora) is grown with several upright stems per plant.1 In one 2025 trial each plant had three stems on a scheduled pruning cycle.11 The 2007 review also states that conilon and robusta flower on the current season’s growth, unlike arabica; no second source opened here confirms this (see Contested).1 The species themselves are described in Coffea arabica and Coffea canephora.

Dimorphic branching#

The orthotropic main axis carries opposite leaves in decussate phyllotaxy; the lateral axes are plagiotropic.5 The vegetative unit, the metamer, consists of an internode, two leaves and 4–5 buds.5 On the stem, the apical meristem produces the head-of-the-series bud in the axil of each leaf primordium; the buds-of-the-series appear only after the generative zone of the internode has formed.1

The head-of-the-series bud of a stem node grows out as a precocious, sylleptic plagiotropic branch – that is, without a rest period. Its fate seems to be determined from its inception in the apical meristem.1 Cenicafé describes the same sequence from the field side: the first bud of the series forms the primary branches, once only, one pair per node; the next forms orthotropic suckers; the rest stay latent or form cauline flowers.2,3 Buds on the branches give only plagiotropic growth.3 Taken together, these statements mean that a stem node does not replace primaries it has lost, and that new upright wood comes from stem buds, not from branches.3

On the plagiotropic axes the apex again forms a head-of-the-series bud and buds-of-the-series in each leaf axil. The head-of-the-series rarely flowers. The buds-of-the-series may grow out later (by prolepsis) into higher-order shoots, develop into inflorescences or remain undifferentiated.1 A 2005 Brazilian study describes the lateral-branch axil as holding 4–5 buds in a linear sequence. The most developed, first-formed bud can become either a new lateral branch or an inflorescence.6

Branch orders are numbered differently between sources (see Contested). A 2018 study traced axes from the first (the stem) to the fifth order.5

Fruiting wood and floral competence#

Flowers originate from the serial buds in the leaf axils of the plagiotropic branches.4 In the 2005 study on arabica (Catuaí Vermelho IAC 81 at Campinas, Brazil), the main flowering came from buds in leaf axils formed since August of the previous year.6 Buds on nodes newly formed during intense vegetative growth were not yet competent to respond to the signals that start flower formation.6 On branches carrying fruit, the fruit delayed floral differentiation until harvest.6

The coffee plant typically fruits only once per node, on branches about 12 months old.4 Under free growth, Cenicafé reports that the plant begins to fruit on one-year-old branches, keeps producing for several years and reaches its highest productivity at 6–8 years of age.2 Annual yield depends mainly on the number of primary and secondary branches formed and on the number of productive nodes on them.3 The rate at which these form follows a sigmoid course. After 4 or 5 harvests it falls, and too few new primaries and nodes form to sustain high yields.3

In equatorial regions without well-defined dry and wet seasons, vegetative and reproductive growth overlap on the same branch: flowers, pinhead-stage fruit and ripe fruit can occur together.4 In Colombia both kinds of growth occur on the same branch in the same year, with reproduction on the wood grown the year before.3 The resulting competition produces alternating high and low crops, more marked in older plantations.3 Die-back, the death of twigs from the tip downwards, may accentuate this biennial cycle.1

Seasonal growth of the branches#

Shoot growth of arabica follows the seasons. At Viçosa, Brazil, it is slow in the cool, dry season and rapid in the warm, rainy season.1 A study cited in the 2018 architecture paper found that about 78% of the length of second-order axes in adult plants in south-eastern Brazil grows in the warm, rainy season.5 In conilon, node production on lateral branches and leaf formation follow the same oscillations in growth.1 Because next year’s fruiting nodes are this year’s new growth, conditions in the growing season set the following crop.3,4

The 2018 study measured leaf growth on axes of different orders in two Brazilian experiments. The time between successive leaves (the phyllochron) and leaf expansion lengthened from second- to fourth-order axes, and leaf timing was slower in the drier, cooler season.5 On the first-order axes of one experiment, about 70–80 metamers had formed by its end.5

Reference values#

Parameter Value Conditions Source
Buds per leaf axil, lateral branch 4–5, in a linear sequence C. arabica, Brazil Majerowicz & Söndahl6
Buds per metamer 4–5 (with 2 leaves, 1 internode) C. arabica, Brazil Rakocevic & Matsunaga5
Serial buds that give inflorescences 3–5 per axil C. arabica, review Unigarro et al.4
Inflorescences per leaf axil 3–4 C. arabica, Colombia Arcila Pulgarín2
Flowers per inflorescence 4–5 (4–6 in another Cenicafé passage) C. arabica, Colombia; review Arcila Pulgarín2; Unigarro et al.4
Buds per leaf axil, stem and branches 4–5, in a linear row C. arabica, Colombia Arcila Pulgarín2
Leaf axils per node 2, opposite C. arabica Arcila Pulgarín2
New stem node every 25–30 days (average) C. arabica, Colombia Arcila Pulgarín2
Primary pairs formed per year 12–14 C. arabica, Colombia Arcila Pulgarín2
Age of fruiting wood ≈12 months; once per node C. arabica, review Unigarro et al.4
Peak productivity (free growth) 6–8 years of age C. arabica, Colombia Arcila Pulgarín2
Decline in new branches and nodes after 4 or 5 harvests C. arabica, Colombia Arcila Pulgarín3
Share of second-order axis length grown in the warm, rainy season ≈78% Adult C. arabica, south-eastern Brazil (cited study) Rakocevic & Matsunaga5
Height 2–8 m C. arabica Kew9
Height up to 12 m C. canephora NParks10

Cenicafé puts the potential at 24–32 flower buds per node of a branch (12–16 per axil).2 Multiplying its own ranges (3–4 inflorescences of 4–5 flowers in each of two axils) gives up to 40 (our calculation), so the upper ends of the two figures differ.

Management levers in the architecture#

Several field levers work through this architecture. Nitrogen fertilisation raised robusta yields by extending the fruiting zone along the plagiotropic branches, in a study cited by the 2007 review.1 Self-shading lengthens internodes and reduces the number of fruiting nodes (rosettes) per branch.8 Reducing the space between stems increases the death of plagiotropic branches in the lower third of the plant, according to a study cited in a 2019 Brazilian trial.8 Denser planting moves the fruiting zone upwards, according to the 2007 review.1

Stem renewal acts on the same logic. Biennial production is buffered in conilon by the periodic pruning and renewal of the orthotropic stems.1 Plant spacing ranges widely. The 2007 review notes that earlier arabica plantations had fewer than 2,000 trees per hectare and multi-stemmed conilon in Brazil sometimes fewer than 1,000. It cites evidence for an optimal density of about 5,000 trees per hectare for short-stature arabica cultivars, and of no more than 4,000 for conilon.1 Pruning methods, stumping and renewal cycles are Farm topics.

Describing growth stages#

Field studies need a common way to name stages. The extended BBCH scale for coffee codes growth stages with a two-digit decimal code.7 The first digit names one of ten principal growth stages, the second a secondary stage within it.4

Open questions#

  • Bearing on current versus previous wood. Why arabica flowers only on the previous season’s branches, while conilon and robusta are reported to flower on the current season’s growth, is not explained (see Contested).1
  • Interactions between buds. The two primary meristems of one stem node seem to interact in controlling branching; the review does not describe how.1
  • Older nodes. No source opened for this entry measured how often arabica nodes flower a second time.

Key studies#

DaMatta et al., 2007 – Ecophysiology of coffee growth and production. Reviews how coffee grows, flowers and sets fruit. Describes the fixed dimorphism of stem and branches, the fate of head-of-series and serial buds, and how fertilisation and planting density shift the fruiting zone.

Brazilian Journal of Plant Physiology 19(4), 485–510 · doi:10.1590/S1677-04202007000400014

Majerowicz & Söndahl, 2005 – Reproductive buds in arabica. Followed bud induction and differentiation on lateral branches in Brazil. The main flowering came from axillary buds formed the previous year; buds on fresh nodes were not yet competent to flower, and fruit on a branch delayed floral differentiation.

Brazilian Journal of Plant Physiology 17(2), 247–254 · doi:10.1590/S1677-04202005000200008

Rakocevic & Matsunaga, 2018 – Leaf growth across the tree structure. Tracked leaf growth on axes of the first to fifth order in adult arabica plants in two Brazilian experiments, with irrigation and raised CO2 as factors. Found that leaf growth parameters were determined by axis order and slowed in the dry, cool season.

Annals of Botany 122(1), 117–131 · doi:10.1093/aob/mcy042

Unigarro et al., 2025 – Flowering and fruiting from phenology. Reviews arabica phenology from bud initiation to harvest. Describes serial buds and inflorescences, fruiting once per node on wood about a year old, and the upward and outward shift of the fruiting zone.

Plants 14(21), 3396 · doi:10.3390/plants14213396

Arcila-Pulgarín et al., 2002 – BBCH scale for coffee. Adapts the extended BBCH scale to coffee, with a two-digit code for principal and secondary growth stages from germination to senescence. It gives growers and researchers one shared vocabulary for stages.

Annals of Applied Biology 141(1), 19–27 · doi:10.1111/j.1744-7348.2002.tb00191.x

Contested
  • Which wood robusta flowers on: a 2007 review states that arabica bears flowers only on the previous season’s branches, while conilon and robusta flower only on the current season’s growth.1 No second source opened for this entry describes the canephora pattern, so the contrast rests on one review.
  • Counting branch orders: a 2007 review calls the primaries “first order” branches1; a 2018 architecture study counts the stem as the first order, so its primaries are second-order axes.5 The plants are the same; the numbering differs.
Share or cite this entry

Change log

  • – Planting densities corrected: the 2007 review gives fewer than 1,000 trees per hectare as past practice for multi-stemmed conilon, not as an optimum; its optimum for conilon (no more than 4,000) was added. Reason: The review presents the low figure as historical spacing, with separate optimum values.
  • – Flower buds per node now given as Cenicafé's own 24–32 (12–16 per axil); our earlier calculation of 24–40 is kept only as a note on the difference. Reason: The source states its own total, which is lower than the product of its ranges.
  • – Overlap of flowers, pinhead fruit and ripe fruit on one branch limited to equatorial regions without well-defined seasons; an unsupported claim that neighbouring nodes interact in branching was removed; the statement that floral induction takes place in serial buds was reworded to where flowers originate. Reason: The 2025 and 2007 reviews say no more than this.

Sources

  1. ADaMatta, F. M.; Ronchi, C. P.; Maestri, M.; Barros, R. S. (2007). Ecophysiology of coffee growth and production. Brazilian Journal of Plant Physiology 19(4), 485–510. doi:10.1590/S1677-04202007000400014 · other copies
  2. AArcila Pulgarín, J. (2007). Crecimiento y desarrollo de la planta de café. In: Arcila Pulgarín, J. et al. (eds), Sistemas de producción de café en Colombia, Cenicafé, ch. 2.
  3. AArcila Pulgarín, J. (2007). Renovación y administración de los cafetales para estabilizar la producción de la finca. In: Arcila Pulgarín, J. et al. (eds), Sistemas de producción de café en Colombia, Cenicafé, ch. 7.
  4. AUnigarro, C. A.; Cayón Salinas, D. G.; León-Burgos, A. F.; Flórez-Ramos, C. P. (2025). Flowering and Fruiting of Coffea arabica L.: A Comprehensive Perspective from Phenology. Plants 14(21), 3396. doi:10.3390/plants14213396 · other copies
  5. ARakocevic, M.; Matsunaga, F. T. (2018). Variations in leaf growth parameters within the tree structure of adult Coffea arabica in relation to seasonal growth, water availability and air carbon dioxide concentration. Annals of Botany 122(1), 117–131. doi:10.1093/aob/mcy042 · other copies
  6. AMajerowicz, N.; Söndahl, M. R. (2005). Induction and differentiation of reproductive buds in Coffea arabica L.. Brazilian Journal of Plant Physiology 17(2), 247–254. doi:10.1590/S1677-04202005000200008 · other copies
  7. AArcila-Pulgarín, J.; Buhr, L.; Bleiholder, H.; Hack, H.; Meier, U.; Wicke, H. (2002). Application of the extended BBCH scale for the description of the growth stages of coffee (Coffea spp.). Annals of Applied Biology 141(1), 19–27. doi:10.1111/j.1744-7348.2002.tb00191.x · other copies
  8. ABaitelle, D. C.; Verdin Filho, A. C.; Freitas, S. de J.; Miranda, G. B.; Vieira, H. D.; Vieira, K. M. (2019). Cycle pruning programmed on the grain yield of arabica coffee. Ciência e Agrotecnologia 43, e014419. doi:10.1590/1413-7054201943014419 · other copies
  9. ARoyal Botanic Gardens, Kew (2026). Arabica coffee. Kew, plant profile (copy in the UK Government Web Archive, March 2026).
  10. ANational Parks Board, Singapore (2022). Coffea canephora. Flora & Fauna Web, National Parks Board (NParks), Singapore.
  11. AColodetti, T. V.; Tomaz, M. A.; Sartori, L.; de Salles, R. A.; de Souza, I. V.; Senra, J. F. de B.; Rodrigues, W. N. (2025). From anthesis to harvest: evolution of the fructification of Conilon coffee genotypes grown at a transitional altitude. Bragantia 84, e20250028. doi:10.1590/1678-4499.20250028 · other copies

Tier A · authoritative · B · trade and expert · C · general. Supporting quotes for every source are in the data version of this entry. If a publisher’s site refuses access, try the doi link or “other copies”.

Suggest a change

On Branching and fruiting wood. Tell us what you would change and why. A source that supports it helps most.