Salicornia seeds pack a surprisingly rich nutritional profile for a crop most people have never heard of. The tiny seeds of this salt-loving plant contain roughly 30–35% protein and yield an oil dominated by linoleic acid, a polyunsaturated fatty acid that makes up around 75% of the seed oil’s total fat content. While the fleshy green stems of Salicornia (commonly called glasswort, sea beans, or samphire) have long been eaten as a salty vegetable, the seeds represent a less familiar but potentially more consequential part of the plant, one that researchers have been studying for decades as a possible oilseed and protein crop that can be irrigated with seawater.
What Makes the Seeds Nutritionally Interesting
The seed oil is the feature that first attracted agricultural scientists. Analyses of Salicornia bigelovii seeds grown in Pakistan found linoleic acid levels between roughly 75% and 79% of total fatty acids, with oleic acid contributing about 12–17% and small amounts of linolenic acid rounding things out at 1.5–2.3%.1PubMed. Analytical characterization of Salicornia bigelovii seed oil cultivated in Pakistan That linoleic acid percentage is high even compared to safflower and sunflower oil, both of which are already considered linoleic-rich. Polyunsaturated fatty acids overall represent more than 63% of total fatty acids across different growing conditions.2Bulletin of the National Research Centre. Comparative evaluation of Salicornia bigelovii oil planted under different treatments
Beyond the oil, the defatted seed meal left over after pressing is protein-dense. Chemical analysis of Salicornia bigelovii seed meal has found around 34% crude protein by weight, with a gross energy content comparable to other oilseed meals.3Animal Feed Science and Technology. Nutrient composition and feeding value of Salicornia bigelovii torr meal in broiler diets However, the amino acid profile is not as balanced as soybean meal. Lysine and sulfur-containing amino acids are the most limiting, which matters if you are thinking about Salicornia meal as a standalone protein source. Proteome studies of Salicornia brachiata seeds have found that globulins make up about 55% of total seed storage proteins, followed by albumins at about 34%. The albumin fraction is notably rich in sulfur-containing amino acids, which have nutritional value as dietary supplements.4PubMed. Proteome profiling of seed storage proteins reveals the nutritional potential of Salicornia brachiata Roxb., an extreme halophyte 5Journal of the American Oil Chemists’ Society. Protein fractionation and properties of salicornia meal
The seeds also contain bioactive compounds that go beyond basic macronutrients. Extracts from Salicornia brachiata seeds show meaningful levels of polyphenols, flavonoids, and condensed tannins, along with antioxidant activity in standard lab assays.6PubMed Central. Valorizing Salicornia brachiata Seeds: A Rich Source of Polyphenols, Essential Fatty Acids, and Therapeutic Bioactivities Whether those antioxidant properties translate to measurable health benefits in humans is an open question, but the phytochemical richness adds to the case that Salicornia seeds are more than just a curiosity.
How Salicornia Has Been Eaten Historically
Salicornia’s culinary history centers on its shoots, not its seeds. The fleshy green stems have a natural saltiness that makes them popular in coastal cuisines from Europe to East Asia. In the Pacific Northwest, coastal Indigenous peoples have eaten the succulent perennial glasswort since at least the 1880s, according to ethnobotanical records from Tlingit and other First Nations communities.7Canadian Journal of Botany. Forensic palynology and ethnobotany of Salicornia species (Chenopodiaceae) in northwest Canada and Alaska Inland species were used for grain in some regions further south, though this practice was less common. In European and Middle Eastern cooking, fresh Salicornia shoots appear in salads, pickles, and as a garnish for fish dishes. The shoots’ briny crunch has made them a staple at upscale restaurants in recent years.
The seeds, by contrast, have historically been a byproduct rather than a food in their own right. Their very small size (about 0.41 grams per thousand seeds in optimal conditions for S. bigelovii) makes them impractical to harvest by hand for eating.8Plant Species Biology. Photoperiod affects growth, seed production, and biochemical composition in Salicornia species under salinity Their value has been recognized mainly in the context of mechanical oil extraction, where a field of Salicornia can be harvested and processed at scale. The oil is suitable for cooking and has a mild flavor, but it has not yet reached wide commercial availability. Conceptually, Salicornia seed oil occupies a niche similar to that of safflower or high-linoleic sunflower oil: a polyunsaturated cooking oil with a light taste.
Growing a Crop on Seawater
The single most remarkable thing about Salicornia as an agricultural plant is that it thrives on saltwater irrigation. Six years of field trials in an extreme coastal desert showed that Salicornia bigelovii irrigated directly with seawater produced seed and biomass yields that matched or exceeded those of conventional freshwater oilseed crops like soybean and sunflower.9PubMed. Salicornia bigelovii Torr.: An Oilseed Halophyte for Seawater Irrigation That finding, published in Science in 1991, is the foundational result that launched decades of follow-up research. Growing an oilseed crop on land too salty for conventional agriculture, using water that would kill virtually any other crop plant, is a genuinely unusual capability.
The relationship between salinity and seed production is not straightforward, though. Research on Salicornia europaea found that brackish water (moderately salty) produced higher seed yields and shoot biomass than either freshwater or full-strength seawater in most ecotypes tested.10Plant Science. Effect of irrigation salinity and ecotype on the growth, physiological indicators and seed yield and quality of Salicornia europaea So “the saltier the better” is not quite right. Salicornia actually needs some salt to hit peak productivity, but there is a sweet spot. Separate work on diluted seawater irrigation found that a 50% dilution of seawater, combined with supplemental fertilizers and algae extract in the soil, gave the best growth and seed yields.11PubMed. Influences of Irrigation with Diluted Seawater and Fertilization on Growth, Seed Yield and Nutrients Status of Salicornia Plants
Daylight length also plays a role. Longer days (16-hour photoperiods) favor both seed weight and seed yield in S. bigelovii, which has implications for where the crop can be grown productively.8Plant Species Biology. Photoperiod affects growth, seed production, and biochemical composition in Salicornia species under salinity These agronomic details matter because scaling up Salicornia cultivation means choosing the right combination of water salinity, latitude, soil amendments, and ecotype. Different ecotypes of the same species respond differently to the same conditions. For example, ecotype differences in seed yield and thousand-seed weight were significant across experiments with S. europaea, and the ecotype-by-environment interaction was minimal for most traits other than plant height and seed weight.10Plant Science. Effect of irrigation salinity and ecotype on the growth, physiological indicators and seed yield and quality of Salicornia europaea In plain terms, some varieties reliably outperform others across a range of salty soils.
The Aviation Fuel Connection
One of the more ambitious applications for Salicornia seed oil has nothing to do with food. A pilot-scale project demonstrated that Salicornia oil can be converted into certified aviation fuel, essentially jet fuel from a plant grown on salt flats. A techno-economic analysis of the biorefinery process found that it becomes economically sustainable at a production scale of about 900 barrels per day, which would require roughly 20,000 hectares of Salicornia cultivation. At that scale, the projected payback time on the capital investment was about seven years.12Biofuels, Bioproducts and Biorefining. Sustainable pilot‐scale production of a Salicornia oil, its conversion to certified aviation fuel, and techno‐economic analysis of the related biorefinery
That is a large-scale vision, and it has not yet been realized commercially. But the concept is appealing because it sidesteps the central criticism of biofuels: that they compete with food crops for arable land and freshwater. Salicornia can grow on salt-affected coastal land, using brackish or seawater, land and water that have no current agricultural value. If the economics work out at scale, Salicornia-derived jet fuel could provide a genuinely low-conflict feedstock for aviation decarbonization.
Animal Feed Applications
Before Salicornia seeds reach widespread human consumption, they have found a more immediate path as animal and aquaculture feed. Trials with Nile tilapia found that Salicornia meal could replace up to 40% of the fish meal in their diet without any reduction in growth or changes to body composition.13Journal of the World Aquaculture Society. Replacement of Fish Meal with Salicornia Meal in Feeds for Nile Tilapia Oreochromis niloticus Higher replacement levels did reduce weight gain, and fish fed diets made entirely from Salicornia meal grew the slowest, with reduced body fat and increased moisture content. The practical takeaway is that Salicornia meal works well as a partial protein substitute in aquaculture, not as a complete replacement.
One complication is saponins, naturally occurring compounds in Salicornia seed meal that can interfere with nutrient absorption and growth, particularly in fish. Autoclaved Salicornia meal fed to tilapia showed lower growth when saponins were not counteracted, but adding cholesterol to the diet ameliorated the saponin-related effects, allowing up to 50% replacement of standard protein sources.14Aquaculture International. Nutritional evaluation of autoclaved Salicornia bigelovii Torr. seed meal supplemented with varying levels of cholesterol on growth, nutrient utilization and survival of the Nile tilapia (Oreochromis niloticus) The presence of saponins is something that would also need to be addressed in any human food application, likely through processing steps like heat treatment or solvent extraction.
Broiler chicken trials paint a similar picture. While Salicornia seed meal has high crude protein and reasonable energy content, its amino acid profile is limiting compared to soybean meal, especially in lysine and sulfur-containing amino acids.3Animal Feed Science and Technology. Nutrient composition and feeding value of Salicornia bigelovii torr meal in broiler diets Blending Salicornia meal with other protein sources would be necessary to compensate for those gaps in any feed formulation.
Safety Concerns Worth Knowing About
Salicornia is a halophyte, meaning it actively absorbs salts from its environment. That trait is what makes it agriculturally interesting, but it also means the plant can accumulate heavy metals from contaminated soils or waters. A study of Salicornia europaea harvested from salt marshes on Korea’s west coast found that concentrations of arsenic, cadmium, copper, and lead exceeded national standards for salt products. The researchers concluded that harvesting and eating wild Salicornia from those sites could be harmful.15Journal of Environmental Science International. Heavy Metal Accumulation in Halophyte Salicornia europaea and Salt Marsh in West-coast of Korea Research on a related species, Salicornia ramosissima, confirmed that the roots accumulate the most cadmium, and accumulation patterns vary with both salinity and metal concentration in the environment.16PubMed. The influence of cadmium contamination and salinity on the survival, growth and phytoremediation capacity of the saltmarsh plant Salicornia ramosissima
This does not mean all Salicornia is contaminated. It means that wild-harvested Salicornia from industrial coastlines or polluted estuaries is a gamble. Cultivated Salicornia grown on clean substrates with controlled water inputs would not carry the same risk. The distinction between wild foraged and farm-raised is critical here, much as it is for shellfish or seaweed. If you are buying Salicornia from a farmer who manages their water supply, heavy metal contamination is unlikely to be an issue. If you are picking it off a random salt marsh near an industrial port, the picture changes entirely.
The saponin content mentioned in the aquaculture feed context is another consideration for human consumption. Saponins are common in many edible plants (quinoa, chickpeas, soybeans) and are typically managed through rinsing, soaking, or cooking. Salicornia seed meal would likely need similar processing before being used as a food-grade ingredient.
Seed Dimorphism and Germination
Salicornia europaea produces two distinct types of seeds, large and small, on the same plant. This dimorphism is not just cosmetic. The two seed types show different salt-tolerance mechanisms during germination, meaning they respond differently to salty growing conditions.17Plant Diversity. Effect of salinity on seed germination, growth and ion content in dimorphic seeds of Salicornia europaea L. (Chenopodiaceae) From a survival standpoint, this is a hedge. By producing seeds with different germination strategies, the plant increases its chances that at least some offspring will establish themselves regardless of whether the next season is wetter, drier, saltier, or fresher. For anyone trying to cultivate Salicornia at scale, seed dimorphism also means that germination rates and seedling vigor can vary within a single harvest, which complicates planting protocols.
Environmental Services Beyond Food
Salicornia cultivation offers ecological benefits that go beyond producing seeds and shoots. The plant’s ability to grow on degraded, salt-affected land makes it a candidate for rehabilitating coastal soils. Measurements of aboveground carbon fixation in Salicornia brachiata growing on intertidal soils in India ranged from about 0.8 to 1.9 tonnes of carbon per hectare, depending on the site.18PubMed. Biomass production, nutrient cycling, and carbon fixation by Salicornia brachiata Roxb.: A promising halophyte for coastal saline soil rehabilitation Those numbers are modest compared to a tropical forest, but the comparison is unfair. The relevant comparison is between Salicornia-covered salt flats and bare salt flats, where the alternative is zero carbon fixation and ongoing soil degradation.
Broader reviews of Salicornia’s potential emphasize the combination of carbon sequestration, soil preservation, and biodiversity support that comes with establishing halophyte cover on otherwise barren coastal land.19Turkish Journal of Food and Agriculture Sciences. Salicornia as a salt-tolerant crop: potential for addressing climate change challenges and sustainable agriculture development In regions where rising sea levels and irrigation-induced salinization are taking conventional cropland out of production, planting a crop that actually uses salt as a growth input, rather than being killed by it, turns a liability into a resource. The harvested biomass yields seeds for oil and meal, the shoots can be sold as a vegetable, and the remaining plant material can be composted or used as animal fodder. It is an unusually tidy agricultural loop for a crop that barely exists commercially.
Where Things Stand Commercially
Despite decades of research, Salicornia seeds remain a niche ingredient. The shoots have made more commercial headway, appearing in specialty grocery stores and restaurant kitchens across Europe and North America. Salicornia seed oil is produced in small quantities by a handful of companies, mostly as a specialty or cosmetic oil rather than a mass-market cooking fat. The protein meal has not yet entered the human food supply in any significant way, though its role in aquaculture feed continues to be studied.
Several practical barriers slow commercialization. Harvesting the tiny seeds mechanically at scale requires adapted equipment. Processing them to remove saponins and manage salt content adds cost. Regulatory approval for novel food ingredients varies by country, and Salicornia seed products would need to clear those hurdles in most markets before they could be sold for human consumption. The economics of Salicornia farming also remain uncertain outside of pilot projects. The aviation biofuel analysis suggested viability at 20,000 hectares of cultivation, but no operation of that size currently exists.
What keeps researchers interested is the convergence of needs. Freshwater scarcity is worsening globally. Soil salinization is degrading millions of hectares of farmland. Aquaculture is growing rapidly and needs alternatives to fish meal. Aviation needs low-carbon fuel feedstocks that do not compete with food crops. Salicornia seeds sit at the intersection of all these pressures, a small, strange seed from a plant that drinks seawater, rich in oil and protein, waiting for the economics and regulation to catch up with the science.