How to grow sorghum (grain)
Family Poaceae. Hardy to USDA hardiness zone 5a+ (U.S. Department of Agriculture). Full sun. Ready in 90-120 days.
Sun
Full sun
Spacing
6-8 in
Days to harvest
90-120 days
Hardiness
Zone 5a+
What growers actually recorded
Loading zone 7b results…
When to plant sorghum (grain)
- Direct sow: ~2 weeks after last frost.
Companion plants for sorghum (grain)
Plant with: Cowpea, Bean.
Common pests & problems
Aphid, sorghum midge, birds at the heading stage.
Feeding & fertilizer
N-P-K ratio: High N (10-5-5): corn is a nitrogen hog
Organic options: Compost + aged manure deep in the row · Blood meal side-dress at knee-high · Fish emulsion at tasseling
When to feed: Feed at planting, knee-high, and tasseling: three big meals.
Watch for: Small ears / missing kernels = under-feeding or poor pollination.
N = nitrogen (leaves), P = phosphorus (roots and flowers), K = potassium (fruit and disease resistance). How to read a fertilizer label →
Grower's tip
Far more drought-tolerant than corn; where corn stalls in dry heat, sorghum keeps filling its seed head.
When to plant sorghum (grain) in your zone
Free month-by-month sowing and transplanting lists, built from frost dates for your USDA (United States Department of Agriculture) hardiness zone.
Soil & water for sorghum (grain)
Soil & pH
6.0-7.5
Tolerant of poor, dry, and even moderately saline soils; more drought- and heat-tolerant than corn.
Light to moderate compost; sorghum needs less nitrogen than corn to produce a full crop.
Watering
0.5-1 in / week; markedly drought-tolerant once established
Deep, infrequent watering; sorghum's extensive root system lets it outperform corn in dry conditions.
Rolled leaves in the heat of the day that recover by evening are normal; persistent rolling into the next morning signals it is time to irrigate.
Knowing when to harvest
- For grain sorghum: seed heads turn hard and dry, and seeds resist denting with a fingernail, typically 100-120 days from sowing.
- For syrup (sweet) sorghum: harvest stalks when seed heads are in the soft-dough stage, since sugar content peaks before full seed maturity.
- Cut whole seed heads for grain and thresh by rubbing or flailing over a tarp.
Storing & keeping
Dry threshed grain to below about 12-13% moisture, then store airtight in a cool, dry, rodent-proof container for up to a year. Sorghum syrup, once pressed and cooked down from stalks, keeps for a year or more in sealed jars.
What to expect
Per plant: 1-2 oz of grain per head on grain types; syrup varieties yield roughly a quart of syrup per 100 ft of row under good conditions
Troubleshooting sorghum (grain)
Birds strip the grain heads before harvest
Likely cause: Ripening sorghum heads are highly attractive to birds, more so than corn
What to do: Cover heads with mesh bags or netting once seed begins to harden.
Wilted, sickly seedlings, sometimes with a bluish tint, especially after frost or drought stress
Likely cause: Prussic acid (cyanogenic glycoside) buildup, which sorghum and its relatives produce under stress; a livestock feeding hazard more than a home-garden one, but a sign of a stressed crop
What to do: Avoid grazing livestock on stressed or frosted sorghum; for grain harvest this does not affect the mature dry seed.
Varieties worth growing
Dale (grain type)
A widely grown standard grain sorghum with reliable yields.
Sugar Drip (syrup type)
A traditional heirloom grown specifically for cane pressed into sorghum syrup, not for dry grain.
Growing sorghum (grain) in containers
Poor container crop: sorghum grows 5-12 ft tall with an extensive root system suited to field or large-bed conditions, not pots.
Nutrition
Complex carbohydrate, fiber, folate; pair with beans for complete protein.
Common questions
Is sorghum grain and sorghum syrup the same crop?
They can be different cultivar groups of the same species; grain sorghum is bred for large, mature seed heads, while syrup (sweet) sorghum is bred for high-sugar stalks and is typically harvested before the grain fully matures.
Where these numbers come from
- USDA Plant Hardiness Zone Map (2023 revision). Zone assignment and the 30-year normals behind every cold-hardiness figure.
- NOAA NCEI 1991-2020 Climate Normals. Frost dates, growing-season length, and the probability bands on both.
- Cornell, UMN, and UC Davis Cooperative Extension crop guides. Spacing, days to maturity, soil pH targets, and per-plant yield ranges.
- USDA FSIS / FDA Produce Safety guidance. Wash, cure, and cold-storage handling numbers.
Ranges are regional guidance, not a promise for your yard. Your own logged results always override the published range.