Per the crop database's own description, black bean is a "Latin American staple" with an "earthy flavour" and "high protein and fibre." It's Phaseolus vulgaris, the same species as kidney bean, pinto bean, navy bean and cannellini bean also grown on this hub -- all five cross-pollinate with each other and need isolation if you're saving pure seed from more than one type. Grown for drying, it's a frost-tender warm-season legume that fixes its own nitrogen while it grows.
Water need
Even moisture while flowering and podding improves the set, though established plants tolerate short dry spells.
Calories at a glance
3,410 kcal/kg dried -- in the same league as this site's other dried pulses (scale is log-based across all 55 core crops in the calculator).
Temperature Range by Month
Month on the bottom, temperature up the side. The pale green background is what the plant can survive at all -- fatal above or below it, labelled directly on the chart where that applies to your zone. The coral band is its ideal range, and only fades in during the months this zone would actually have the crop in the ground -- reusing the exact same sowing/harvesting data as the calendar further down the page. The blue line is real monthly climate data (not a modelled estimate) for a representative rural/agricultural location in this zone -- a small farming town or agricultural research station rather than a major city, to avoid the warmer bias city weather stations have. For the actual verdict on how well this crop does in your zone, see the badge at the top of the page -- that's based on the site's own researched yield figures, not this chart.
Quick Start: Sowing to Drying
- Sow after frost risk has passed. Sow direct once the soil has warmed and frost risk has passed -- black bean is a frost-tender warm-season crop and won't tolerate cold, wet soil.
- Support climbing varieties. Climbing black bean varieties need a sturdy pole or trellis; bush varieties are self-supporting and need none.
- Leave pods on the plant to dry fully. For dried storage, leave pods on the plant until they've turned dry and papery and the beans inside rattle, rather than picking young.
- Shell and finish drying indoors. Shell the dried pods and spread the beans out somewhere warm and airy for a final week of drying before storing in an airtight container.
- Cook thoroughly before eating. Give dried black beans a full, thorough boil until well past tender before eating, the same sensible precaution worth taking with any dried Phaseolus vulgaris bean.
Sowing & Harvesting Calendar
Pick your zone under "Temperature Range by Month" above and this updates too. Boreal and Alpine show no window at all, since this site's own yield data marks black bean as not viable outdoors there.
Calories & Yield
Black bean is a genuine calorie staple when dried at about 3,410 kcal per kg. Tropical gives the best yield here, and Boreal and Alpine aren't viable outdoors.
| Climate Zone | Yield per plant | Calories per plant | Viability |
|---|---|---|---|
| Tropical / Humid | 3.0 kg | 10230 kcal | Viable -- best yield |
| Subtropical | 2.5 kg | 8525 kcal | Viable |
| Mediterranean | 2.5 kg | 8525 kcal | Viable |
| Temperate Maritime | 0.9 kg | 3069 kcal | Challenging (60% yield) |
| Temperate Continental | 2.5 kg | 8525 kcal | Viable |
| Cool / Boreal | -- | -- | Not viable |
| Arid / Semi-Arid | 0.9 kg | 3069 kcal | Challenging (60% yield) |
| Highland / Alpine | -- | -- | Not viable |
Figures per plant sown, dried weight, from the site's own crop database. Maritime and Arid already reflect the 60% penalty applied to challenging zones.
Varieties Worth Knowing
Black bean varieties differ mainly in climate suitability. Both below are open-pollinated (OP), meaning seed saved from them breeds true and is worth keeping under this site's seed-saving approach; neither is an F1 hybrid.
Seed Saving -- Quick Guide
Black bean is Phaseolus vulgaris, the same species as French bean, kidney bean, pinto, navy and cannellini -- all will cross with each other, but mostly self-pollinate so the risk stays low even grown close together.
SERVINGS, NOT DAILY CALORIES This works out plate-sized servings of black bean from your seed during its fresh harvest window only, not your group's full daily calorie needs. For that, use the main calculator.
Estimated for your selected zone above, using this site's own germination, loss and yield figures for black bean -- a helping is roughly what you'd put on a plate as part of a meal with other veg. Treat it as a planning estimate, not a promise.
Storage & Preservation
Black bean is grown here specifically for dried storage, not fresh eating -- pods are left on the plant until fully dry, then shelled and given a final week of airing indoors before going into an airtight container.
Stored this way in a cool, dry place, dried black beans keep for a genuinely long time -- years rather than months, the same storage league as wheat, oats and this site's other dried staples. As with any dried Phaseolus vulgaris bean, give them a full, thorough boil before eating.
Growing Black Beans Without Bought Inputs
Bean beetles and aphids are the main pests to watch for -- they cluster on soft growth and pods, and heavy infestations can reduce yield.
Handpicking pests and encouraging predator insects with companion flowers is an effective input-free defence, along with keeping plants evenly watered so they aren't stressed.
Black bean fixes its own nitrogen via bacteria in root nodules, genuinely improving the soil for whatever's grown there next -- factor that into a wider rotation plan, not just a calorie one.
Frequently Asked Questions
Does black bean cross-pollinate with the other beans on this hub?
Yes, with four of them -- black bean, kidney bean, pinto bean, navy bean and cannellini bean are all Phaseolus vulgaris, literally the same species, so any two of them grown together can cross. It does not cross with lima bean (Phaseolus lunatus), which is a different species entirely.
Is black bean a good calorie crop for self-sufficiency?
Yes -- around 3,410 kcal per kg dried, in the same league as the site's other dried pulses and grains, and per the crop database it's a genuine Latin American staple, high in protein and fibre as well as calories.
Does black bean need any special cooking precautions like kidney bean does?
It contains far less of the phytohaemagglutinin lectin than red kidney bean, but it's still good practice to give any dried Phaseolus vulgaris bean a full, thorough boil -- a normal cooked-through simmer, well past the point of tenderness, is enough.