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How to Grow Callaloos UK | Regional Planting Calendar
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In the UK, callaloos go in the ground early May to early July.
Callaloos (Amaranthus viridis) — annual.
Timing is the decision that matters most in the UK: there are 4 separate regional sowing windows, ranging from early May in Southern England to early May in Scotland.
Core growing advice on this page is checked against named horticultural and university-extension sources — see References.
Garden Organic: sow after the last frost, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the sources do not support.
Midlands - detail & sources
Garden Organic: sow after the last frost, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the sources do not support.
Northern England - detail & sources
Garden Organic: sow after the last frost, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the sources do not support.
Scotland - detail & sources
Garden Organic: sow after the last frost, with no UK-region-specific dates given; this window is applied across all four sub-regions rather than inventing a north/south gradient the sources do not support.
When to pick: Harvest leaves and leafy stems as a cut-and-come-again crop, cooked like spinach; flower clusters and small (about 1mm) seeds are also edible, seeds cooked whole. Avoid inorganic fertilisers, which cause nitrate concentration in the leaves (PFAF).
A different species from the site's other amaranths
Callaloo (Amaranthus viridis) is a genuinely distinct species from the already-published Grain Amaranth, Blood Amaranth and Love-Lies-Bleeding Amaranth -- grown for its leaves, not primarily for grain.
Across the Caribbean, "callaloo" most commonly refers to Amaranthus viridis or A. tricolor -- usually green-leaved, distinguishing it from red-leaved "Chinese spinach" amaranths.
An annual reaching about 0.5m (1ft 8in) tall, monoecious, wind-pollinated, self-fertile. Native to tropical North America (original habitat obscure), now a weed throughout warm regions globally. USDA zones 7-11, hardy to UK zone 9, frost tender; cannot grow in shade. Soil: light, medium or heavy, prefers well-drained fertile soil, mildly acidic to mildly alkaline pH. Sow seed in late spring direct or earlier indoors under glass; germination is usually rapid and good in warm soil, aided by an overnight temperature drop; cuttings root readily. Edible leaves (cooked like spinach), leafy stems, flower clusters, and small (about 1mm) seeds, cooked whole. Requires hot, sheltered conditions and moist soil. HAZARD: when grown on nitrogen-rich soils, concentrates nitrates in the leaves, a health concern including stomach cancer risk -- avoid inorganic fertilisers.
1 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 should I sow callaloos in the UK?
In Southern England, from early May. In Scotland, wait until early May. Treat these as a guide rather than a fixed date — the governing rule is to sow only once frost risk has passed and temperatures are reliably warm enough.
When do I sow callaloos?
Sow early May to early July.
What soil pH do callaloos need?
A pH of about 6–7.5. 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 callaloos?
Our data links 1 disease and 3 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.
