// SPECIES PROFILE · CROP · INTRODUCED · ANNUAL GRASS

Sorghum

Sorghum bicolor

The fifth-most-important cereal crop in the world and one of the most drought-resilient food plants ever domesticated, sorghum is the right grain for a hot, dry continental summer like NE Oklahoma's. Domesticated in northeast Africa more than 5,000 years ago and brought to the southern US in the 19th century via the African slave trade, sorghum became the foundation grain of the central and southern Plains — "the corn of the plains" — precisely because it produces a reliable harvest on rain that would not finish a crop of corn. The species encompasses three major crop types: grain sorghum (milo), sweet sorghum (for the famous sorghum molasses/syrup), and broomcorn (for craft brooms). All three grow well in NE Oklahoma garden plots.

// QUICK FACTS

Family: Poaceae (grass family); subfamily Panicoideae
Group: Warm-season (C4) annual grain / forage / sugar crop
Origin: Domesticated in NE Africa (Sudan/Ethiopia region) ~5,000+ years ago
USDA hardiness: Annual (frost-killed); needs 90–120 frost-free days
Mature size: 3–14 ft tall depending on variety
Sun: Full sun (essential)
Soil: Wide range; pH 5.5–8.5; tolerates clay, sand, alkaline, saline; well-drained
Water: Highly drought-tolerant; needs less than half corn's water
Crop types: Grain (milo) · Sweet (syrup) · Broomcorn · Forage
Days to maturity: Grain: 90–120 days · Sweet: 100–130 days · Broomcorn: 100–120 days
Gluten: Gluten-free grain — safe for celiac diet
Heat tolerance: Optimal growth at 80–95°F; tolerates 100+°F daily highs
Regional rank: Oklahoma is a top US sorghum-producing state (5th-largest grain sorghum producer)

Sorghum (Sorghum bicolor) — tall corn-like stalks with terminal grain panicles — *Sorghum bicolor*. Photo via Wikipedia / Wikimedia Commons.

Identification & Crop Types

[ field key — corn-like habit · terminal panicle · type by use ]

Habit & Vegetative Form

A robust, single-stemmed (occasionally tillering) C4 annual grass superficially resembling corn (Zea mays) at a distance. Stems are stout, solid (sweet sorghum) or partly pithy (grain sorghum), 3–14 ft tall depending on variety. Leaves are alternate, broad (1–3 in wide), 1–3 ft long, with a prominent white midrib and a wax-coated upper surface — the wax bloom is a major part of the species' drought tolerance, dramatically reducing leaf transpiration. Distinguished from corn by the much narrower stem, the more upright leaves, and the diagnostic terminal panicle inflorescence (corn has a terminal pollen tassel and lateral ear).

Inflorescence & Grain

The diagnostic feature of all sorghums is the terminal panicle: a dense branched cluster of seed at the top of each stem, 4–14 in long, ranging from extremely compact and erect (grain sorghum, milo) to long, drooping, and open (forage sorghums and broomcorn). Grain color varies from white through tan, red, brown, dark purple, to nearly black, depending on variety — one of the most diverse seed-color palettes of any cereal grain. Each individual seed is small (~3–4 mm), round-to-oval, and partially exposed (not fully enclosed in a hull as in oats or barley).

Crop Types

The species S. bicolor is one of the most morphologically diverse domesticated cereals. The four agronomic types:

Grain sorghum (milo): short (3–5 ft), compact erect head, large grain harvest. The dominant US production type, including the heart of OK and KS production.
Sweet sorghum: tall (8–14 ft) with high sugar content in the juicy stalks; grown for sorghum syrup ("sorghum molasses"). Strong Appalachian/Ozark heritage crop.
Broomcorn: tall, with a long open panicle of stiff straw used for craft brooms. Oklahoma was historically a major broomcorn-producing state (Lindsay, OK).
Forage / Sudangrass / hybrid sorghum-sudan: grown for hay, silage, and grazing, often as hybrids with S. sudanense.

Confusables

Corn / Maize (Zea mays): terminal tassel of male flowers + lateral ear of female flowers; broader leaves; thicker stalk. Sorghum has a single terminal panicle bearing the grain.
Johnsongrass (Sorghum halepense): perennial, rhizomatous, weedy escaped relative; smaller seed head; slender stem; highly invasive; produces toxic prussic acid under stress (caution if pasturing livestock).
Pearl millet (Pennisetum glaucum): candle-like cylindrical seed head, not branched panicle.
Sugarcane (Saccharum officinarum): much taller, forms perennial canes; not regionally grown.

Range, Adaptation & NE Oklahoma Production

Sorghum is not a native species in North America — it was domesticated in northeastern Africa (modern Sudan/Ethiopia) at least 5,000 years ago, traveled across Africa and Asia in antiquity, and was brought to the southern US in the 17th–19th centuries primarily through African slave-trade routes; many Plains and Southern sorghum traditions trace directly to West African agricultural heritage. By the late 19th and early 20th centuries it had become the foundation grain of the southern and central Great Plains, perfectly adapted to the region's hot summers and erratic rainfall.

Oklahoma is consistently among the top five US states for grain sorghum production, with major commercial acreage across the western Oklahoma panhandle, the central Plains, and into NE Oklahoma's drier western counties. Yields per acre on commercial dryland sorghum in OK regularly exceed 60–90 bushels, even in years when corn fails — the practical engineering reason sorghum continues to be planted across the southern Plains. For NE Oklahoma garden growers, sorghum is one of the easiest grain crops to grow at home: it asks for nothing more than full sun, warm soil, and a late-spring planting, and it rewards even badly drought-stressed seasons with a usable harvest.

Agronomy & Wildlife / Ecological Notes

[ drought biology · pollination · wildlife · cautions ]

Drought-resilience biology

Sorghum's exceptional drought tolerance derives from a combination of traits: an unusually deep, dense fibrous root system (often 6+ ft); a thick wax cuticle on stems and leaves that dramatically reduces transpiration; the ability to roll its leaves under heat stress (a visible canopy response on hot dry days); and the ability to enter dormancy under severe drought and resume growth when rain returns. C4 photosynthesis (shared with corn, sugarcane, and the warm-season prairie grasses) gives sorghum excellent water-use efficiency in hot conditions — sorghum needs roughly half the water of corn for the same biomass.

Pollination

Sorghum is primarily self-pollinated and wind-pollinated (~95%+ self), which is why open-pollinated heirloom varieties stay relatively true to type from year to year and are practical for the home seed-saver. A small fraction of cross-pollination occurs (~5%), so for absolute purity, separate different sorghum varieties by 100 ft or by 7–10 days flowering offset. Importantly: sorghum will hybridize with weedy johnsongrass (S. halepense); if johnsongrass is present nearby, isolation is more difficult.

Wildlife value

Mature sorghum heads are an extraordinary wildlife food source. Field studies across the central US identify sorghum as a primary fall and winter food for mourning dove, bobwhite quail, ring-necked pheasant, wild turkey, white-tailed deer, fox squirrel, raccoon, and many granivorous songbirds (cardinal, white-throated sparrow, junco, dickcissel). NRCS upland game-bird food plots and CRP wildlife plantings throughout OK routinely include grain sorghum (milo) for this purpose. A small home plot of grain sorghum left standing through fall will dramatically boost backyard bird traffic.

Companion / rotation

Sorghum is a heavy nitrogen feeder — rotate it with legumes (cowpea, southern pea, soybean) the following season to restore soil N. Sorghum's massive root system and decomposing stubble add substantial organic matter to soil, especially in heavy clay sites. Avoid consecutive sorghum-on-sorghum rotations (allelopathy and disease pressure both build); a 2–3 year rotation is standard.

Sorghum syrup — a southern American craft tradition: Sweet sorghum syrup ("sorghum molasses," though it is not technically a molasses) is one of the iconic regional sweeteners of the Ozarks, Appalachia, and the Mid-South. Stalks are crushed in a roller mill, the green juice is cooked down 10:1 in shallow open evaporator pans over wood fire, and the resulting amber-to-dark syrup is bottled. The Vinita and McAlester regions of E Oklahoma have small-batch syrup-making heritage; commercial production today is concentrated in TN, KY, and AR.

Prussic acid (cyanogenic glycosides) — livestock caution: Young, drought-stressed, or frost-damaged sorghum (and especially Sudangrass and sorghum-sudan hybrids) can accumulate cyanogenic glycosides (dhurrin) that release prussic acid (HCN) when chewed by livestock, potentially fatally. Do not graze cattle or horses on stressed, immature, or frost-damaged sorghum. This is not a concern for grain harvested for human consumption, but it is a real risk for grazing systems — consult OSU Extension before grazing.

Cultivation in NE Oklahoma

[ planting · care · harvest · storage ]

When & how to plant

Sorghum needs warm soil — do not plant until soil temperatures at 4 in depth reach a sustained 65°F, typically early-to-mid May in the Tulsa area (about 2 weeks after the last expected frost, around the same window as corn but a week or two later). Direct-seed (sorghum does not transplant well): rows 30–36 in apart, seeds 1–1.5 in deep, 4–6 in apart in row, then thin to 8–12 in spacing once seedlings are established. Seed germinates in 5–10 days under warm conditions.

Care & management

Fertility: a moderate nitrogen feeder. Side-dress with composted manure or organic N fertilizer at knee-high stage; avoid heavy N pre-plant (leads to lodging).
Water: water through establishment (first 30 days); after that, sorghum's exceptional drought tolerance means minimal supplemental irrigation is needed even through a typical NE OK summer dry spell. Excessive irrigation reduces drought-resilience traits and increases lodging risk.
Weeds: mulch heavily or shallow-cultivate during the first 30 days; after canopy closure, sorghum suppresses weeds well.
Pests: sorghum midge (Stenodiplosis sorghicola) can damage developing grain in late-summer; sugarcane aphid is a significant commercial pest. Bird damage to ripening heads is the major home-garden concern — cover heads with mesh sleeves the last 2 weeks before harvest if needed.
Lodging: tall sweet-sorghum and broomcorn varieties may lodge in summer storms; staking or windbreak helps.

Harvest & processing

Grain sorghum: harvest when seeds are hard and easily shattered with thumbnail; cut whole heads, dry on screens or hang in bundles for 2–3 weeks, then thresh (rub heads against hardware cloth over a tub) and winnow. Store in airtight containers; freeze 1 week to kill any insect eggs before long storage.
Sweet sorghum (syrup): harvest when seed is in late dough stage but stalk is still juicy; strip leaves; crush stalks through a juice mill (small craft mills available); cook juice down ~10:1 in a shallow pan on low heat, skimming continuously, until syrup reaches a soft-ball stage (~230°F). Bottle hot.
Broomcorn: harvest when grain is just past dough stage and brush fibers are still pliable; cut, cure, comb the seed off, and tie into brooms.

Heirloom & open-pollinated varieties for NE Oklahoma

Variety	Type / origin	Notes for Tulsa
'Mennonite' / 'White African'	Sweet sorghum; long-grown southern US heirloom	Reliable syrup variety in eastern OK; 100–120 days.
'Sugar Drip' / 'Sugar Drip Sweet'	Sweet sorghum; excellent juice yield, mild flavor	Popular Ozark/Appalachian heritage syrup variety.
'Black Amber'	Sweet sorghum, dark seed, dark syrup	Strong-flavored syrup; shorter season.
'Tarahumara Popping Sorghum'	Heirloom grain sorghum from N Mexico; pops like popcorn	Novel home-garden grain crop; well adapted to OK heat.
'Hank's Black Eye Pea Stripper'	Heirloom broomcorn variety	Traditional craft broom variety.
'Red Broomcorn' / 'Standard Broomcorn'	Broomcorn types, long open red-to-tan panicles	Classic broom-making varieties.
Modern hybrid grain sorghum (Pioneer, DeKalb, etc.)	Commercial F1 hybrids	For maximum bushel yield; will not breed true; check OSU Extension for current variety trial results.

Cultural & Material Uses

Sorghum is one of the most globally important and culturally significant grains on Earth, sustaining hundreds of millions of people across Africa, India, China, and the southern Plains and southern US. Its history is also deeply entangled with the African diaspora and the agricultural traditions Black farmers brought to the southern US.

Global food staple: Worldwide, sorghum is the fifth-most-important cereal after wheat, rice, corn, and barley, and is the staple grain of much of semi-arid Africa (where it is consumed as porridge, flatbread injera, and fermented beverages such as Ethiopian tella and Sudanese marisa) and central India (where it is jowar, eaten as roti flatbread).
Sorghum molasses / syrup: The defining sweetener of much of the rural American South and lower Midwest from the mid-19th century through World War II. Family syrup-making operations using horse-powered stalk crushers and wood-fired evaporator pans persisted across eastern Oklahoma into the mid-20th century; small-batch craft producers continue today in the Ozarks and Appalachia. Sorghum syrup has a distinctive tangy, mineral-rich flavor different from cane molasses or maple syrup.
Gluten-free flour: One of the most widely available gluten-free whole grains for baking, with neutral flavor and good texture in baked goods. Strong recent commercial growth as celiac-disease and gluten-sensitive markets have expanded.
Whole-grain side dish: Whole sorghum berries cook like wheat berries (45–60 minutes simmered) and have a pleasant chewy texture; popular in modern grain-bowl cooking.
Popping sorghum: Some heirloom varieties (notably 'Tarahumara') pop like miniature popcorn and were a traditional snack of the Tarahumara of N Mexico.
Brewing: A major brewing grain across Africa for traditional beers; also a key gluten-free brewing grain in modern gluten-free craft beer.
Broomcorn brooms: Lindsay, Oklahoma was once the "Broomcorn Capital of the World," with annual broomcorn festivals continuing the tradition. The stiff straw-like panicle fibers of broomcorn varieties remain the standard material for handmade and commercial brooms.
Livestock feed: Grain sorghum (milo) is a primary feed grain across the southern Plains for cattle, swine, and poultry, where it substitutes nutritionally for corn at lower production cost in dryland conditions.
Forage and silage: Sorghum, Sudangrass, and sorghum-sudan hybrids are major emergency-forage and silage crops across Oklahoma and Texas, valued for biomass yield in drought years when corn silage fails.
African-American agricultural heritage: Sorghum is one of the major crops brought to the Americas through the African diaspora, and its role in Reconstruction-era and 20th-century Black farming traditions in the southern US, including Black-owned farms in Oklahoma's historic all-Black towns (Boley, Langston, Rentiesville, etc.), is part of regional agricultural history.

Sources & Further Reading

USDA NRCS PLANTS Database — Sorghum bicolor: plants.usda.gov/plant-profile/SOBI2
Oklahoma State University Extension — "Grain Sorghum Production in Oklahoma" (PSS-2161); current variety trial results.
Oklahoma State University Extension — "Sweet Sorghum: Production and Syrup Making" guides.
Kansas State University — Sorghum and Pearl Millet Production Handbook (regional reference for the central Plains).
USDA-ARS Sorghum Research — international sorghum genetics and drought-tolerance research.
National Sweet Sorghum Producers and Processors Association (NSSPPA) — syrup-making technical resources.
Carney, J. & Rosomoff, R. (2009), In the Shadow of Slavery: Africa's Botanical Legacy in the Atlantic World (UC Press) — African origins and African-American agricultural history of sorghum.
Smith, C.W. & Frederiksen, R.A., eds. (2000), Sorghum: Origin, History, Technology, and Production (Wiley) — comprehensive technical reference.
Bonnett, O.T. (1948), "The development of the wheat spike and the sorghum panicle," USDA Yearbook of Agriculture.
Wikipedia — Sorghum bicolor: en.wikipedia.org/wiki/Sorghum_bicolor
Seed Savers Exchange — heirloom sorghum variety listings and seed-saving notes.