How to Grow Marama Beans USA

By the SoilCommander Editorial Team, under the guidance of Nitin Sharma, Co-Founder · · How we check our facts

On this page
  1. Marama Bean (Tylosema esculentum)
  2. Soil & Growing Conditions
  3. Quick Facts
  4. Harvest & Storage
  5. Marama bean in the Kalahari
  6. What the research guides add
  7. Marama bean in the USA: climate data
  8. Growing Marama Bean in another region
  9. Sources
  10. Frequently Asked Questions

Marama beans (Tylosema esculentum) — Long-lived perennial with a large tuberous root.

Unlike an annual crop, the work here is front-loaded into establishment: get the planting and the site right and the same plants crop for several seasons.

Marama Bean (Tylosema esculentum)

A scatter of reddish-brown marama bean seeds. Photo: Bonolo Nikita Rankaga, CC0

2 sources cited

Soil & Growing Conditions

A marama bean plant trailing across Kalahari sand — “Tylosema esculentum” by dune_ninja is licensed under CC0. Source: iNaturalist
“Tylosema esculentum” by dune_ninja is licensed under CC0. Source: iNaturalist.

Water: Very low; native to 100-900 mm rainfall with long periods of drought

Soil pH range

5.5 7

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Quick Facts

A marama bean flower photographed beside a ruler for scale — “Tylosema esculentum” by Riana Fourie is licensed under CC0. Source: iNaturalist
“Tylosema esculentum” by Riana Fourie is licensed under CC0. Source: iNaturalist.
Factor Value
Soil pH 5.5 - 7
Soil texture Sandy and limestone soils including dolomite; not on soils over granite or basalt
Drainage Free-draining
Lifecycle Long-lived perennial with a large tuberous root; several years from sowing to first crop.

Harvest & Storage

A marama bean pod among the leaves — “Tylosema esculentum” by Robert Taylor is licensed under CC BY 4.0. Source: iNaturalist
“Tylosema esculentum” by Robert Taylor is licensed under CC BY 4.0. Source: iNaturalist.

When to pick: Not a crop for one season: PROTA records 2-4 years to first flowering and about 3.5 years to seed. Young tubers can be dug earlier and eaten as a vegetable.

What the research guides add

A marama bean plant (Tylosema esculentum), a trailing vine
A marama bean plant (Tylosema esculentum), a trailing vine. Photo by Ee nn yy, CC BY-SA 4.0.

Marama is a wild desert legume that is barely domesticated, and the review below explains the drought strategy that decides where it could be grown.

  • A wild perennial legume native to the Kalahari Desert in Southern Africa, growing mostly in sandy soils. (Frontiers in Plant Science)
  • Because it grows in sandy soil, water can remain in the root zone for months after rain and a taproot reaches it. It also forms a true tuber that acts as both a starch reservoir and a water reservoir. (Frontiers in Plant Science)
  • Older tubers weighing more than 200 kg can contain 90% water by weight, and the bean very likely survives drought by drawing on this stored water. (Frontiers in Plant Science)
  • The seed is high in protein and the tuberous root high in carbohydrate, making the bean an important local food. (Frontiers in Plant Science)

Marama bean in the USA: climate data

City USDA zone Last spring freeze (32°F) First fall freeze (32°F) Freeze-free days
Bismarck, ND 4a 14 May 27 Sep 136
Madison, WI 5b 1 May 10 Oct 160
Milwaukee, WI 6a 19 Apr 29 Oct 192
Atlanta, GA 8a 15 Mar 20 Nov 252
Orlando, FL 10a 25 Jan winter freezes only 355
San Diego, CA 11a none in a median year none in a median year 365

Dates are the median 32°F freeze dates and freeze-free days from NOAA NCEI U.S. Climate Normals 1991–2020; zones come from the USDA 2023 Plant Hardiness Zone Map (ZIP code of each city centre).

Last verified 2026-10-25

Growing Marama Bean in another region

Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.

Sources

The full list of 2 sources behind this guide (Plant Resources of Tropical Africa (PROTA), Useful Tropical Plants (tropical.theferns.info)) is in the references of our UK guide to marama beans; they describe the plant itself, which is the same wherever it grows.

Frequently Asked Questions

What soil pH do marama beans need?

A pH of about 5.5–7. 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.

Plan next season before the problems start

Almost everything on this page resolves to your own frost dates rather than the calendar — the last spring frost moves by roughly two months between zone 3 and zone 10. The USA Garden Planner works from your zone so the timing is already decided before the season starts.

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Instant PDF download · Written for US growing conditions

SoilCommander Editorial Team — under the guidance of Nitin Sharma, Co-Founder

Every growing guide is checked against RHS, USDA Cooperative Extension, and other named horticultural authorities before publishing. How we check our facts.

How this guide is put together

The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against USDA hardiness-zone and frost-date data, with Cooperative Extension sources cited directly where one exists for a crop. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.

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