How Tall Is a Cotton Plant? Height by Stage and Variety

How tall is a cotton plant? Extension targets for commercial cotton in US fields sit at about 28 to 36 inches (2.3 to 3 feet), and the final figure is set by variety, water, heat and growth regulators. Texas A&M guidance says 28 to 32 inch plants suit stripper harvest best, and that picker cotton under heavy irrigation should be held to about 32 inches, because harvest efficiency drops once plants pass 36 inches. Cotton is a perennial shrub by nature, so plants left to grow for years become larger and woody.

This guide explains what sets cotton plant height, how height changes stage by stage, how growers measure it with the height-to-node ratio and the top internodes, and how cold and frost stop growth. It includes a height-to-node calculator, charts from USDA and National Cotton Council data, and links to the extension guides behind each number.

How tall is a cotton plant at a glance

The table sums up the height figures and the source for each. All are for upland cotton (Gossypium hirsutum) grown as an annual crop.

Plants in humid, well-watered fields with long seasons can grow past these targets, which is why growers there manage rank growth. Dryland crops in a dry year stay shorter, because drought shortens every internode.

What is a cotton plant?

Cotton is a perennial shrub in the mallow family that farmers grow as an annual. Four species are cultivated. Upland cotton makes up most of the world crop, and Pima or Egyptian cotton (Gossypium barbadense) gives longer fibre. The National Cotton Council describes cotton as having perhaps the most complex structure of all major field crops, with an indeterminate growth habit: it keeps adding leaves and fruit at the top while bolls mature lower down.

That habit is the reason height matters. A plant that keeps growing puts sugar into stems and leaves instead of bolls. Growers want enough height and leaf area to carry a full boll load, but not so much that the canopy shades the lower bolls, delays maturity and slows the harvester.

Parts of the plant that set its height

• Main stem: grows from the terminal bud and adds one node at a time.
• Nodes and internodes: a node is where a true leaf joins the stem; the internode is the stem length between two nodes. Final height equals node count times internode length.
• Vegetative branches: grow from the lower nodes and add bulk, not much fruit.
• Fruiting branches: the first usually forms at the sixth or seventh main-stem node, according to the National Cotton Council, and later ones follow at each new node.
• Taproot: can reach 10 inches or more by the time the cotyledons open.

Cotton plant height by growth stage

Cotton growth is predictable when water and temperature are good. The National Cotton Council’s growth and development guide measures it in heat units called DD60s. Each day adds the average of the high and low temperature minus 60°F, because cotton grows very little below 60°F. A new main-stem node appears about every 50 to 60 DD60s, the Texas Cotton Production manual says, whether those heat units come in two days or ten.

Chart

Days for each cotton growth stage

Range of days per stage, Mid-South, under good moisture and temperature

The chart shows the days the National Cotton Council gives for each stage in the Mid-South. Height follows the same path: slow for the first month, fast from first square to peak bloom, then nearly flat after cutout, when the plant stops adding nodes.

1. Planting to emergence (4 to 9 days, 50 to 60 DD60s): seedling stands 1 to 2 inches tall.
2. Emergence to first square (27 to 38 days, 425 to 475 DD60s): plants add a node every few days and stay short.
3. First square to first flower (20 to 25 days, 300 to 350 DD60s): the fastest stretch of height gain. This is when growers decide on growth regulators.
4. First flower to open boll (45 to 65 days, 850 to 950 DD60s): height gain slows as bolls take more of the plant’s sugar. Height gain stops at cutout, when the plant stops adding nodes.
5. Open boll to harvest: no new height. The crop is defoliated and picked or stripped.

If your plants are 3 feet tall and in bloom, the stage table gives a rough answer to how long until harvest: about 45 to 65 days from flower to open boll, then a couple of weeks more for defoliation. Our guide to when cotton is harvested gives usual dates by state.

What controls how tall cotton grows

The Texas Cotton Production manual lists early-season temperature, wind, variety, water, fertility, plant type, row spacing and plant density as factors behind plant height, and the National Cotton Council adds heavy square loss to insects. Each acts through node count, internode length or both.

Variety

Breeding for earliness has favoured shorter, more determinate varieties, the National Cotton Council notes. Picker varieties grown in the Southeast and Mid-South tend to have more growth potential than stripper types bred for the Texas High Plains. Seed company ratings for “growth habit” or “PGR need” are the best guide to how hard a variety will push.

Water

Water drives internode length more than anything else. A long internode of 3 to 5 inches shows good conditions and a risk of rank growth, and a short one of 0.5 to 1 inch shows the plant was stressed when that node formed, the Texas manual says. Irrigated cotton is taller than dryland cotton in the same county. For scheduling, see our page on cotton water requirements.

Nitrogen and soil

Extra nitrogen early in the season pushes leaf and stem growth. The 2026 Mid-South growth regulator guide links rank growth to excess nitrogen and plenty of water, and says fields with excess nitrogen need frequent, aggressive growth regulator use. Deep, fertile soils with good water holding grow taller plants. Read more about soil fertility and regenerative soil practices.

Heat

Warm days speed node production. Cotton Australia’s education kit gives ideal day temperatures of 27 to 32°C (81 to 90°F) with nights of 16 to 20°C. It adds that nights below 11°C cause “cold shock” and days above 36°C cause “hot shock”, both of which slow development. Our guide to the best climate for cotton covers temperature and rainfall in detail.

Plant density

Thick stands compete for light, and plants in them tend to stretch. Thin stands make bushier plants with more vegetative branches. Neither extreme helps yield.

Insects and fruit loss

When plant bugs or other pests knock off squares, the plant has fewer bolls to feed and puts the spare sugar into height. The National Cotton Council names heavy square loss from insects, along with too much nitrogen, as a cause of tall, rank cotton. Our page on insect pest management covers scouting.

How to measure cotton plant height and the height-to-node ratio

Height alone does not tell you much without the node count. The Texas Cotton Production manual explains how to measure both:

1. Pick 10 plants in a row in a typical part of the field.
2. Measure height from the cotyledon node (the seedling leaves) to the terminal, in inches.
3. Count main-stem nodes. The top node counted is the one with an unfurled leaf at least 1 inch across, about the size of a quarter. The cotyledon node is node zero.
4. Divide height by nodes. A plant 20 inches tall with 15 nodes has a height-to-node ratio (HNR) of 1.33.

The same manual says the ratio should range from 1.3 to 2.0 inches per node, especially during bloom. A low ratio points to stress from drought, cold or pests. A high one points to rank growth. The 2026 Mid-South guide adds a warning: the ratio sums up the whole season so far, so it does not show how fast the plant is growing now.

The top internode test

For the current growth rate, the Mid-South guide measures the internode between the fourth and fifth nodes down from the top. Its rule:

• Under 2 inches: growth is not strong; a growth regulator is often not needed.
• 2 to 3 inches: an application is likely warranted, at a light or moderate rate.
• Over 3 inches: apply soon, likely at an aggressive rate.

The calculator below runs both checks. Enter your own field counts.

Try the numbers for your own farm below.

How growers keep cotton from growing too tall

The main tool is mepiquat chloride, sold under names such as Pix, often with cyclanilide in newer mixes. It does not shrink a plant. As a Crops & Soils article from the American Society of Agronomy explains, it makes a more compact plant by shortening internodes, cutting the number of main-stem nodes and reducing leaf area. Treated leaves look darker green.

The same article reports a two-year trial where aggressive mepiquat chloride use cut final height, reduced nodes and hastened maturity, with no effect on lint yield in either year. The response was far smaller in dryland cotton in the dry year. In the irrigated plots, cutout came two to three weeks earlier.

The 2026 Mid-South guide is plain about yield: penalties from poor growth management are usually seen only when plants are extremely short or extremely rank. Its authors note that short, open canopies and tall, lapped canopies often yield about the same. The bigger gains from height control are earlier maturity, less boll rot in the lower canopy, better spray coverage and faster harvest.

• Start only after 50% of plants have matchhead squares, as labels require.
• Base the rate on the top internode and the field’s growth potential, not on the calendar.
• Check again every 7 to 14 days, as the Texas High Plains guide suggests.
• Lower the rate or wait if the crop is short of water; very aggressive rates just before drought can cut yield, the Mid-South guide warns.

Always read and follow the product label, and check local rules and your extension agronomist’s advice before using any growth regulator.

Frost and cold: what stops a cotton plant growing

Cotton comes from warm regions and has no frost hardiness. Development nearly stops below 60°F, which is why heat units start there. A frost kills leaves and the terminal; a hard freeze kills the plant and ends the season, so any boll not mature by then will not open well.

Cold matters at both ends of the season:

• Planting: seed in cold soil emerges slowly and seedlings get disease. The LSU AgCenter advises a mean daily soil temperature of 65°F or more at 4-inch seeding depth, measured at 8 a.m., for at least three days in a row.
• Late season: in the northern Cotton Belt (Missouri, Kansas, northern Texas and Oklahoma), the first fall frost sets the last date bolls can finish. Growers there choose earlier varieties and use growth regulators to bring cutout forward.
• Cold spells in summer: temperatures below about 11°C (52°F) briefly hold back development, Cotton Australia says, and can delay maturity.

Frost also halts height gain for good. A plant that has stopped at 30 inches because of a freeze will not regrow that year. For a full look at temperature limits, see our cotton climate guide. Field-level forecasts are available through the satellite weather API.

Where cotton grows in the United States

Plant height varies by region because the regions differ in water and season length. USDA’s October 2026 Crop Production report forecast US cotton at 13.4 million 480-pound bales, 3% below 2025, with an average yield of 790 pounds per harvested acre. Texas alone was forecast to harvest 3.9 million acres of upland cotton, by far the largest of any state in that report.

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Upland cotton area harvested by state

1,000 acres, USDA forecast of 1 October 2026, the eight largest states

The chart shows harvested area by state for the 2026 forecast. Texas High Plains cotton is mostly stripper-harvested and grown short. Georgia, Arkansas and Mississippi grow taller picker cotton in more humid fields.

Harvest was well under way by mid-October. USDA’s Crop Progress report for the week ending 18 October 2026 showed harvest ahead of the five-year average in Arkansas, Mississippi and Tennessee, and behind it in Oklahoma, Kansas and South Carolina.

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Cotton harvested by 18 October 2026

Percent of planted area harvested, selected states, week ending 18 October 2026

Using satellites to track cotton growth

Scouting 10 plants at a time works, but it is slow on large fields. Satellite images measure how much green leaf covers the ground. NASA’s Earth Observatory explains that the NDVI index uses red and near-infrared light, which healthy leaves reflect very differently. In cotton, green leaf cover grows fastest in the weeks from first square to peak bloom, when height also climbs fastest, so NDVI rises then too.

Field maps can show which zones are growing rank and which are stressed, so scouts can measure plants and top internodes where it matters. The Sentinel-2 satellites, described on the Copernicus SentiWiki, give a revisit of 5 days at the Equator, with four bands at 10-metre detail. Farmonaut uses this imagery to map crop vigour across each field through the season. Sensors in the field add soil moisture and canopy data; see our page on IoT in cotton farming. Satellite maps support, but do not replace, plant measurements.

▶ How satellite NDVI maps show crop stress before you can see it in the field. · 4:09

▶ A step-by-step tutorial on monitoring crops with satellite imagery and crop health indices. · 8:43

Best practices for healthy cotton plant height

• Choose a variety whose growth habit suits your water and harvester.
• Plant into warm soil to get an even, vigorous stand.
• Split nitrogen and avoid heavy early rates on fertile ground.
• Keep early squares on the plant with timely scouting for plant bugs.
• Measure height, nodes and the top internode weekly from first square to first bloom.
• Use growth regulators on actively growing cotton, based on those numbers.
• Watch the fall frost date and plan cutout so bolls can mature.

Related pages on our site: soil for cotton, crop monitoring, agribusiness partnerships, site monitoring software and the farm app.

▶ Six plain steps to start precision farming, from field maps to satellite monitoring. · 4:18

How we checked the numbers

Height targets come from Texas A&M AgriLife’s High Plains growth regulator guide and its Texas Cotton Production manual, and from the 2026 Mid-South growth regulator guide written by cotton specialists at five land-grant universities. Stage timing comes from the National Cotton Council. Area, yield and harvest progress come from USDA NASS reports released in October 2026. Height ranges by region are general; your variety and season will differ.

FAQ

How tall is a cotton plant?

Extension targets for US commercial cotton sit at about 28 to 36 inches (2.3 to 3 feet). Texas A&M guidance aims for 28 to 32 inches for stripper harvest and warns that harvest efficiency falls above 36 inches.

How tall do cotton plants get in the wild?

Cotton is a perennial shrub. Left to grow for several years in a warm climate with no frost, it becomes a larger, woody plant. Farm cotton is defoliated and harvested each year, or killed by frost, so it stays far shorter.

How long does a cotton plant take to grow?

The National Cotton Council gives 60 to 70 days from planting to first flower and 45 to 65 days from flower to open boll, so first bolls open about 105 to 135 days after planting, with defoliation and harvest after that.

What is a good height-to-node ratio for cotton?

Texas A&M’s manual gives 1.3 to 2.0 inches per node, especially during bloom. Below that suggests stress; above it suggests rank growth.

Can frost kill cotton plants?

Yes. Cotton has no frost tolerance. A light frost kills leaves and the growing tip, and a hard freeze kills the plant, ending boll growth for the season.

How do farmers stop cotton growing too tall?

They apply plant growth regulators such as mepiquat chloride when the top internodes are long, manage nitrogen and water, and protect early squares from pests. Follow the label and local advice.