A drought-tolerant warm-season grain that produces dense seed heads on tall stalks and thrives where corn struggles in heat and dry spells.
Sorghum bicolor · also called grain sorghum, milo
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Sorghum demands far less water than corn for a comparable grain yield, making it a practical choice for hot, dry summers. The grain is gluten-free and can be popped, ground into flour, or fermented.
A little history. Sorghum bicolor originated in northeastern Africa and was domesticated roughly 5,000 years ago, according to archaeological and genetic evidence. It is a C4 grass, meaning its leaf anatomy channels carbon dioxide directly to photosynthetic cells, sharply reducing water loss under high heat.
Sow seeds 1 inch (25 mm) deep, and aim for 6 inches (15 cm) between plants once thinned. Cover seed to exactly 1 inch; firm soil over the row to ensure contact. Keep the seedbed moist but not waterlogged until shoots emerge. Seedlings emerge in 5–10 days.
Water deeply once a week during establishment; reduce to every 10–14 days once plants are knee-high. Water when the top 2 inches of soil are dry and lower leaves begin to roll inward slightly. Aim for about 1 inch per week; less once heads form.
Side-dress (scatter fertilizer along the row and water in) once at knee height and again at head emergence. What to use: nitrogen-forward fertilizer such as blood meal or 10–5-5 organic; sorghum is a heavy nitrogen user.
It's ready when seeds are hard and dry, the head has turned from green to tan or red-brown, and the moisture content feels chalky rather than doughy when a seed is pressed between fingernails. Cut the entire head with 6 inches of stalk using pruning shears. Hang heads upside down in a dry, ventilated space for 2–3 weeks, then thresh by rubbing heads over a wire mesh or bucket.
Store threshed, fully dry grain in sealed glass jars or airtight containers in a cool, dark location; properly dried grain keeps 1–2 years.
In climates with a long warm season, a second sowing 4–5 weeks after the first extends harvest; do not attempt succession planting where the season is shorter than 120 frost-free days.
Cowpea
Cowpea banks nitrogen in root nodules, and most of it is released only as those roots break down — so it feeds the bed the season after, not the sorghum standing beside it. Interplanted rows still work well because the low cowpea canopy covers ground the tall stalks leave open.
Sweet Potato
Sweet potato vines sprawl into a dense mat that shades the soil surface, holds moisture, and crowds out weeds between widely spaced sorghum rows. It often reduces mid-summer watering, provided the sorghum is spaced wide enough that the vines still get light.
Sunflower
Sunflower heads feed hoverflies, lacewings, and tiny parasitic wasps that hunt the aphids that colonize sorghum leaves. It can help under low to moderate aphid pressure; give sunflowers their own row so the two tall crops are not shading each other out.
Sesame
Sesame sends down a deep taproot while sorghum feeds from a fibrous mat in the top foot of soil, so the two often share a dry bed without fighting over water. Both handle heat, which keeps the planting uniform through mid-summer.
Johnsongrass is a close wild relative that carries over the same leaf viruses, midges, and aphids that attack sorghum, giving them a green bridge between seasons. Pull or mow it along bed edges and fencelines before sorghum heads emerge.
Sudangrass
Sudangrass shares sorghum's diseases and pests — head smut, anthracnose, midge — so growing them side by side stacks the risk on both. It also sheds pollen onto sorghum heads, which ruins saved seed. Keep them in separate seasons or separate beds.
Teff
Sorghum is another warm-season grass and often carries the same rusts and smuts as teff, so side-by-side plantings stack spore pressure in humid weather. Separate the two and keep them out of each other's rotation slot.
Proso Millet
Sorghum stands 5 to 8 feet tall and roots deeply, taking the light and soil moisture that a 3-foot millet plant needs during grain fill. As a fellow grass it also carries the same downy mildew and smut problems, so give it its own bed well away.
Pearl Millet
Sorghum hosts the same downy mildew, rust, ergot, and head smut that trouble pearl millet, so planting them side by side stacks the risk and gives spores a short hop between crops. Keep them in separate beds and separate rotation years.
Foxtail Millet
Sorghum grows well past head height and out-competes the shorter millet for light and water, while both grasses host the same leaf diseases and seed-head pests. Plant them in separate beds and separate seasons.
Give grasses and grains 2 years away from this spot before any of its relatives return.
The pea and bean family, the squash family or the tomato family thrive in this ground next season.
Sorghum is a heavy feeder that leaves behind coarse, slow-rotting stalk residue and a depleted nitrogen bank. Keep grasses and grains out of this bed for 2 years, then follow with legumes to rebuild nitrogen, or with squash-family or tomato-family crops.
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