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Drought-tolerant varieties
Choosing what to sow. Four different things are sold as "drought tolerant", and they range from a real but modest edge in modern cultivars to a market decision dressed as agronomy. This is the first technique on this site whose case is strongest in the Mediterranean.
The short answer
Pick from your national trial network's dry years, not from the catalogue. Differences between modern cultivars in a dry year run to about 10% either side of the mean, though most are not statistically significant within a single campaign, and they re-rank from one dry year to the next. Spain's GENVCE, France's Arvalis and the UK's AHDB publish the data; a "drought tolerant" label on a seed bag does not.
Heritage grain is a market decision, not a drought one. Landraces keep about 90% of their yield under drought against 75% for modern cultivars, but from a base about half as high. They pay only when a buyer pays two to five times the commodity price, as French artisan bakers do at up to €1,000 a tonne organic (2024).
Sorghum replaces maize below a threshold, not everywhere. Crop modelling puts the crossover at roughly 250 mm of crop water use: below it sorghum wins and maize can fail; with water, modern maize yields about 11.5 t/ha against 8 for sorghum. Name the threshold, not the crop.
The trade-off first
The traits that protect a crop in a bad year can cap it in a good one: earlier flowering escapes the drought and shortens grain filling; a lower ceiling spends less water and returns less grain. Whether that trade-off actually bites depends on which of four things "drought tolerant" means, so this page grades them one at a time.
This is also the first technique on this site whose case is strongest in the Mediterranean. Cover crops and intercropping export humid-climate benefits south; varietal choice runs the other way.
Modern drought-tolerant cultivars: a modest, real, unstable edge
Newer generally beats older even in drought. A field trial on China's Loess Plateau (2015 to 2016) compared a landrace, a 2004 cultivar and a 2014 cultivar: the newest had the deepest roots and the best access to subsoil water after flowering, and the modern cultivars lost less yield when rainfed (Frontiers in Plant Science, 2017). Non-European, and direction only.
The "no penalty" result is a model. Senapati and colleagues optimised wheat types with the Sirius crop model at 13 European sites under a 2050 climate. Drought-tolerant types yielded 13.4% more overall, 28 to 37% more in southern Europe, 10 to 23% more in central and eastern Europe, and no more at all (1% or less) in north-western Europe, with 44% lower year-to-year variance and no yield penalty in good years (Journal of Experimental Botany, 2019). The authors say field validation "is difficult". So the best European evidence that drought tolerance comes free is a simulation. Treat it as the hypothesis the trial networks should be testing. That north-western result is also why this page does not list the Atlantic zone: where the modelled advantage disappears, choosing a variety for drought tolerance is not a drought strategy, even though it remains a variety decision worth making on yield and disease.
What the trial networks show. Spain's GENVCE network tested 101 varieties at 44 sites in 2023 to 2024 and describes the previous campaign as "much more affected by the generalised drought", with many trials cancelled; it reports by rainfall zone, semi-arid under 500 mm, sub-humid 500 to 700 mm and humid above 700 mm (GENVCE 2023 report). In that drought campaign its durum wheat averaged 3,802 kg/ha and winter barley 4,639 kg/ha, with varieties spread about 10% either side of the mean and most differences not statistically significant. The UK's AHDB built a dry-conditions rating from its Recommended List trials and found clear winners and losers as sites dried, but on one year of data (2011), and the rating does not appear to have entered the published list (AHDB). A later screen of 120 varieties under managed drought found real variation in drought tolerance and rankings that changed year to year (AHDB).
Reading. The edge is about 10% either side of the mean, mostly not significant within one campaign, and it moves between years. That is precisely why you need multi-year network data for your zone rather than a single dry campaign. A catalogue's "drought tolerant" is a vendor claim until the network says so.
Landraces and heritage grains: lose less, from half the base
A 2025 systematic review of 13 studies puts the pattern in numbers: under drought, modern varieties retain about 75% of their yield, evolutionary populations 85%, landraces 90%; landraces also carry more grain protein (14.0% against 12.0%) and less rust, and lose on uniformity and milling (Frontiers in Sustainable Food Systems, 2025).
Retaining a larger share of a smaller yield is not more grain. In a Mediterranean field comparison of 19 genotypes at a semi-arid and a Mediterranean site from 2018 to 2020, modern cultivars out-yielded landraces by 102% across environments (Plants, 2021). Hulled wheats sit lower still: einkorn roughly 1 to 2 t/ha, spelt and emmer 3 to 4 t/ha in good conditions, against 8 to 10 t/ha for intensive European wheat, 30 to 60% below common wheat (Central European analysis, 2025, as reported).
So a landrace is a drought strategy only if the price makes up the yield. In France, heritage and population wheats sell to artisan bakers for up to €1,000 a tonne organic, about double standard organic wheat and roughly five times the €200 a tonne conventional farm-gate price of 2024 (La Toque, trade press; Réussir on 2024 prices). In Ontario in 2023, spelt needed CAD 750 a tonne against CAD 700 for organic wheat to match margin, and einkorn about CAD 2,000 because half its weight is hull (Farmtario). That is the whole arithmetic: a premium of two to five times, or nothing. The claims page has the full case.
Sorghum for maize: a threshold, not a direction
Sorghum roots to 1 or 2 m and uses less water. Crop modelling over 31 years at two sites puts the crossover at about 250 mm of crop water use: below it sorghum out-yields maize and maize "generally failed to produce any grain" below about 200 mm; above it, well-watered maize reaches about 11.5 t/ha against 8 for dwarf sorghum (in silico Plants, 2021). US field data add a caution: modern maize hybrids out-yielded modern sorghum across water levels; sorghum won under water limitation only against 1970s or older maize (Field Crops Research, 2024, as reported).
European farmers have followed the droughts anyway. France grew 103,000 ha of grain sorghum in 2024, first in Europe, exporting about 65% of its roughly 293,000 t (2023) mainly to Spain; Italy grew 40,580 ha; EU sorghum production rose 57% in a decade at an average 5.62 t/ha. Those figures come from Sorghum ID, the crop's promotion body, and are labelled as such (Sorghum ID; USDA GAIN EU report, 2024). The claims page sets the threshold against the slogan.
Pulses in the rotation are a related switch. Spanish rainfed yields are low and volatile: chickpea 835 kg/ha, dry pea 1,023, lentil 626 in 2023, a recovery year, and grain legume area fell 11.6% in 2024 to 434,290 ha (MAPA statistics via Agronews). The rotation and nitrogen benefit is real, and eco-scheme rotation payments partly underwrite it (see the funding page); as a drought yield strategy it is a low-yield, high-variance choice.
Evolutionary populations: the best stability evidence here
Populations are bulk mixtures of many crosses left to adapt on the farm. In the 2025 review they show the lowest yield variation of any group (coefficient of variation 10.5% or less against 14.9% for modern varieties), and the best-performing populations yielded as much as or more than the commercial check, with farmers' own selection improving yield and stability across years; the advantage appears under drought and tends to disappear in favourable conditions (ICARDA populations grown in Italy since 2010, European Journal of Agronomy, 2020, as reported; Italian populations study). The UK's ORC Wakelyns Population, 190 crosses from 20 parents through eleven generations of field selection, is described by its developer as having "greater yield stability than its parent varieties" (Organic Research Centre).
The legal route is new. Since 1 January 2022, Regulation (EU) 2018/848 lets organic heterogeneous material be marketed after notification rather than variety registration (GEVES). A 2023 Commission proposal would extend heterogeneous material to all farming, keep conservation varieties tied to their region of origin and allow farmer seed exchange "only locally"; it has been in trilogue since February 2026 (European Parliament briefing754645_EN.pdf)).
Where it fits
| Context | Fit | Why |
|---|---|---|
| Rainfed cereals, Mediterranean and continental Europe | Best | Modelled 28–37% and 10–23% advantage for drought-tolerant types; GENVCE publishes dry-zone data |
| Rainfed cereals, Atlantic Europe | Weak | Model finds ≤1% difference; UK rating is one year old |
| Maize below ~250 mm crop water use | Switch to sorghum | Maize can fail to set grain; sorghum yields |
| Maize with water | Stay | 11.5 vs 8 t/ha in maize's favour |
| Heritage grain with a named buyer at 2–5× | Good as a business | Low inputs, high price; not a yield strategy |
| Heritage grain without a buyer | Avoid | A 50% yield cut with nothing to pay for it |
| Organic, low-input cereals | Populations | Lowest variance; equal-or-better yield; seed saved without royalty |
| Irrigated land, perennials, pasture | Not applicable | Choose for potential; nothing here for groves or grass |
What it costs
No seed-price differential for "drought-tolerant" cultivars was found; certified seed costs what certified seed costs. Every figure below carries its country and year.
| Item | Figure | Country, year | Source |
|---|---|---|---|
| Heritage or population wheat, organic, to artisan bakers | up to €1,000/t | France, 2024 | La Toque, trade press |
| Conventional soft wheat, farm gate | about €200/t | France, 2024 | Réussir |
| Spelt price to match organic wheat margin | CAD 750/t vs CAD 700 | Ontario, 2023 | Farmtario, non-European |
| Einkorn price to match margin | about CAD 2,000/t | Ontario, 2023 | Farmtario |
| Hulled wheat yield vs common wheat | 30–60% lower | Central Europe, 2025 | as reported |
| Rainfed pulse yields | chickpea 835, pea 1,023, lentil 626 kg/ha | Spain, 2023 | MAPA via Agronews |
| EU grain sorghum yield | 5.62 t/ha | EU, 2023–24 | Sorghum ID, industry |
| Farm-saved seed royalty exemption | cereal harvest under 92 t | EU | Regulation 2100/94 |
Seed legality. Farm-saved seed of a protected variety carries a royalty unless the farm's cereal harvest is under 92 tonnes; landraces, conservation varieties and heterogeneous material are public domain and carry none (Liveseed practice abstract). Conservation varieties may be marketed only in their region of origin (Directive 2008/62/EC).
Timeline. One season. The decision is remade every year with the seed order.
Commitment
Fully reversible. No capital, no land change. The only obligations are a scheme declaration and any forward contract you sign for heritage grain.
How to start
- Use the national network's dry-year data. GENVCE in Spain, Arvalis in France, AHDB in the UK: find the varieties that held their index in the last dry campaign in your zone, and expect the order to change.
- Split a field: half your current variety, half the candidate, same management.
- If your worst field runs below about 250 mm of summer crop water use, trial sorghum on it before giving up on maize elsewhere.
- Sell heritage grain before you sow it: a named buyer at a named premium. Without one, a landrace is a yield cut and nothing else.
- For populations, buy heterogeneous material from an organic breeder and save your own seed; keep a modern check strip to measure against.
- Do not stack penalties. A landrace, under no-till without rotation, in a dry monoculture, is three yield cuts at once. See no-till and intercropping for the other two.
Risks and failure modes
A lower ceiling in good years for heritage types and for older drought-escape cultivars; the model's "no penalty" for modern types is unvalidated.
Re-ranking. The variety that won the last drought may not win the next. Single-year ratings are not enough.
No buyer for heritage grain or mixed populations, and einkorn needs dehulling.
Lodging and disease in tall landraces; standardisation problems at the mill.
Sorghum establishes poorly in cold springs, suffers bird damage, and has a feed-only market in most of Europe.
Seed law. Marketing a conservation variety outside its region, or saving protected seed above the 92 t threshold without royalty, is an infringement.
Vendor claims. "Drought tolerant" on the bag is marketing until the trial network confirms it.
Claims checked. Ancient grains are drought-proof and Sorghum out-yields maize in drought. None of the case studies tested varieties; a variety-network dry-year analysis would be a natural addition.
If you irrigate. Variety choice and irrigation scheduling are the two levers on the same problem in the irrigated Mediterranean, and the scheduling one is free in much of Spain, Italy and Portugal.