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How to Grow
Blood Amaranth: How to Grow & Harvest (UK)
Move through the SoilCommander growing library like a course: keep the navigation in place, open the next lesson, and build your garden plan step by step.
Rows marked derived are interpolated between regions our sources do state, because no source we consulted gives a figure for that region specifically. They are deliberately wider to reflect that uncertainty.
United Kingdom - detail & sources
The RHS entry for this species records hardiness but no sowing month, so the window here follows the species-level guidance in Ecocrop: sow in late spring where the plants are to grow, or start earlier under glass and plant out only once the last frost has passed. The plant is frost-tender (RHS hardiness H2, 1-5C) and dies below about 4C, so an April start belongs under cover, not outdoors.
When to pick: Two harvests come off one plant, and they are read differently. Leaves: the first picking is ready roughly 30-50 days after sowing, and the plant will keep giving cuttings for many months afterwards (Ecocrop, via Useful Temperate Plants). Grain: the seed head is left standing until it dries down and the seed threshes free when a head is rubbed between the fingers. In a cool summer the crop rarely dries fully on its own -- the Alternative Field Crops Manual (Purdue NewCROP) states that "a killing frost must occur before harvest followed by a week of good drying weather", and Iowa State Extension likewise has growers wait until about a week after the first hard frost. Cut before the heads begin to shatter or the plants lodge, since seed lost that way cannot be recovered.
Blood Amaranth, a Dual-Purpose Grain and Leaf Crop
Ecocrop: the first cutting of mild, spinach-like leaves comes 30-50 days after sowing, and the same plant keeps producing for months while the seed head fills.
Every one of those tiny crimson flowers sets a seed. The panicle is left standing until it dries down and the grain threshes free when a head is rubbed between the fingers.
RHS hardiness H2 (1-5C): the plant dies below about 4C. Sow late spring where it is to grow, or start under glass and plant out only once the last frost has passed.
RHS: full sun, moderately fertile humus-rich soil kept moist, watered freely through summer. Drought resistant once established, but it will not thrive in shade.
Alternative Field Crops Manual (Purdue NewCROP): "a killing frost must occur before harvest followed by a week of good drying weather." Iowa State Extension advises the same week-after-frost wait.
Grown on nitrogen-rich soil, amaranth concentrates nitrates in its foliage. Feed for steady growth rather than pushing it hard when the leaves are destined for the kitchen.
RHS gives an ultimate height of 1.5-2.5m with a spread of 0.1-0.5m, reached within a single year. Give it room and shelter from wind, which topples loaded seed heads.
"Amaranth" on a seed packet may mean this species, love-lies-bleeding (A. caudatus) or A. hypochondriacus. Check the botanical name if you are buying for grain rather than colour.
Directly fetched and verified (not a blended search summary). Field survey of 43 peri-urban Amaranthus farms; identifies anthracnose (Colletotrichum), wet rot (Choanephora cucurbitarum), wilting/damping-off (Fusarium, associated genera), and stem canker (Phoma/Alternaria) as the major fungal diseases.
Directly fetched and read. Independent corroboration of the frost-then-dry harvest trigger given by the Alternative Field Crops Manual: northern growers wait about a week after the first hard frost, balancing field drying against pre-harvest loss from lodging and seed shatter.
Specifically about vegetable amaranth (A. tricolor), a DIFFERENT species from A. caudatus/cruentus/hypochondriacus. Used only for: (a) confirming caudatus/cruentus/hypochondriacus are the grain-type Amaranthus species, and (b) pest genera (stem weevil, leaf caterpillars) that the source itself sources from CABI as genus-wide. Explicitly NOT used for A.-tricolor-specific growing-condition numbers.
Addresses grain amaranth production generally (primarily A. hypochondriacus / A. cruentus, the commercial US grain species); not species-disambiguated in the source itself.
Original habitat obscure, probably tropical America. Vigorous annual to about 1m with branched stems and terminal flower spikes. Optimal temperature 22-28C, tolerating 10-45C but dying below 4C. Prefers well-drained fertile soil in a sunny position, pH 5.5-7 preferred, tolerating 4.3-7.5. Sow in late spring where plants are to grow, or raise under glass and transplant after the last frosts; germination improves with warm soil and a drop in overnight temperature. EDIBLE PARTS: leaves cooked like spinach, mild-flavoured and rich in vitamins A and C, iron and calcium; seeds highly nutritious, eaten cooked, ground into flour or sprouted. First leaf harvest 30-50 days after sowing, continuing for up to 250 days more. CAUTION: on nitrogen-rich soils the plant concentrates NITRATES in the leaves.
9 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.
Frequently Asked Questions
When do I sow blood amaranth?
Sow early April to early May.
What soil pH do blood amaranth need?
A pH of about 6.5–7.5. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.
What problems affect blood amaranth?
Our data links 4 diseases and 2 pests to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
Most of the advice on this page comes down to timing and spacing — sowing at the right moment, rotating beds, and giving plants enough airflow. The UK Garden Planner lays your plot out month by month so those decisions are already made before the season starts.
UK vegetable growing guides · Checked against RHS & Met Office guidance
Every SoilCommander guide is written and maintained by our editorial team for real UK growing conditions, and reviewed against Royal Horticultural Society growing advice and Met Office climate data before publication.
Sketch your exact plot shape, pick your UK crops, and get a spacing-accurate bed layout with companion pairings, a rotation plan and month-by-month sowing dates — every fact sourced from RHS and Garden Organic.
