Recao is one of the easiest tropical herbs to grow at home, thrives in conditions that would stress most kitchen-garden plants, and stores well using several straightforward methods. Known botanically as Eryngium foetidum and by dozens of regional names, recao delivers a flavor profile strikingly similar to cilantro but considerably more potent, which makes a small harvest go a long way in the kitchen. Getting the most out of this herb comes down to understanding a few quirks about how it germinates, what kind of light it actually prefers, and how to preserve its volatile oils once the leaves are picked.
What Recao Actually Is
Recao is a biennial herb native to tropical Latin America and the Caribbean. Its long, serrated leaves look nothing like the round, feathery fronds of cilantro, yet the two plants belong to the same botanical family, Apiaceae. Despite their dramatically different appearances, chemical analysis has shown them to be surprisingly similar in their aromatic compounds, a textbook case of convergent evolution between two plants that ended up smelling and tasting alike through completely separate evolutionary paths.1Journal of Horticulture and Postharvest Research. Comparative analysis of the odorants of cilantro (Coriandrum sativum L.) and culantro (Eryngium foetidum L.,) as aromatic crop mimics of family: Apiaceae The leaves grow in a rosette pattern, each one roughly the size and shape of a steak knife blade, with pronounced sawtooth edges that give rise to another common name: sawtooth coriander.
Name confusion is one of the biggest obstacles for people trying to buy or grow recao. In Puerto Rico, it is called recao. In Trinidad and Tobago, it goes by shadow beni or shado beni. Throughout Central America, it is culantro (not cilantro). In Southeast Asia, where it is used just as widely, it may be labeled sawtooth herb, long coriander, or Thai parsley. All of these names refer to the same plant. If you see “culantro” at a Latin market or “ngo gai” at a Vietnamese grocery, you are looking at recao.
Growing Conditions That Recao Prefers
Recao’s natural habitat is the understory of tropical forests, and that origin story tells you almost everything you need to know about growing it. It wants warmth, moisture, and shade. This puts it at odds with most Mediterranean herbs (basil, oregano, rosemary) that crave full sun and well-drained soil. Treat recao more like a fern or a shade-loving lettuce, and you will get much better results.
- Light: Partial to full shade. Direct afternoon sun in warm climates causes the leaves to become tough, pale, and bitter. A spot that gets morning light and afternoon shade is ideal. Indoors, a north-facing window or a spot a few feet back from an east-facing one works well.
- Temperature: Recao grows best between roughly 70°F and 90°F (21–32°C). It has essentially no frost tolerance. Below about 50°F (10°C), growth stalls. In temperate climates, treat it as a warm-season annual or grow it indoors year-round.
- Soil: Rich, consistently moist, slightly acidic to neutral soil. Think garden bed with plenty of compost worked in, not sandy or rocky ground. A heavy potting mix that retains moisture is better than a fast-draining cactus blend.
- Water: Keep the soil evenly moist but not waterlogged. Recao is more forgiving of overwatering than most herbs, but standing water will still rot the roots. In containers, make sure drainage holes are open but water frequently enough that the soil never dries out completely.
Hydroponic growers have also had success with recao. Research on hydroponic culantro cultivation in Costa Rica found that crop water-use coefficients peaked at around 1.15 in early growth and 1.4 during later stages, and that providing overhead plastic cover (which reduces direct light and rain exposure) affected water dynamics without harming yields.2Agronomía Costarricense. Efecto de la protección y la nutrición sobre parámetros hídricos y el rendimiento de culantro coyote (Eryngium foetidum) hidropónico The takeaway for home growers is that recao adapts well to controlled environments, and shading it deliberately can be part of a successful strategy rather than a compromise.
Starting Recao From Seed
Recao is almost always started from seed, and germination is the single most frustrating stage for first-time growers. The seeds are tiny, and they are slow. Expect anywhere from two to four weeks before you see sprouts, sometimes longer in cooler conditions. Some growers report waiting six weeks. Patience is non-negotiable.
A few practical tips to improve your odds. First, do not bury the seeds deeply. Press them lightly onto the surface of moist soil or cover them with the thinnest possible dusting of fine compost. They benefit from light during germination. Second, keep the surface consistently damp. A humidity dome or a sheet of plastic wrap over the tray helps. Remove the cover once sprouts appear to prevent fungal problems. Third, warmth accelerates the process. A heat mat set to about 75–80°F (24–27°C) can shave a week off germination time.
If you can find an established recao plant at a nursery or farmers’ market, you can skip the germination headache entirely. Transplanting a started plant into your garden or container is straightforward. Just keep it shaded and well-watered during the transition period. Recao can also self-seed readily once it flowers, so if you let one plant bolt and set seed, you may find volunteers appearing in the same bed the following season.
Managing Growth and Preventing Bolting
Once established, recao is a vigorous grower. A healthy rosette will produce new leaves from the center continuously, and you can begin harvesting outer leaves as soon as the plant has six to eight of them. Cutting the outer leaves first encourages the plant to keep producing from the middle, extending your harvest window.
The main challenge is bolting. When recao decides to flower, it sends up a tall central stalk covered in small, spiny flower heads. Once that stalk appears, the plant shifts its energy away from leaf production, and the remaining leaves become tougher and less flavorful. To delay bolting, keep the plant in shade, keep it well-watered, and harvest regularly. Some growers pinch off flower stalks the moment they appear, which can buy a few more weeks of leaf production, though the plant will eventually try again.
Bolting is triggered primarily by heat stress, drought, and long day length. This is why recao grown in full sun tends to bolt faster than shade-grown plants. In tropical regions near the equator, where day length stays relatively constant, recao can produce leaves for many months. In temperate zones with long summer days, the window between establishment and bolting may be shorter. Fertilizing with a nitrogen-rich feed (dilute fish emulsion works well) can also help keep the plant in its leafy, vegetative phase rather than pushing it toward reproduction.
How to Use Recao in Cooking
Recao’s flavor is often described as “cilantro turned up to eleven.” The aroma is similar but denser, more assertive, and longer-lasting in cooked dishes. Where cilantro wilts quickly under heat, recao holds up better, which is why it appears in slow-simmered stews and rice dishes across the Caribbean, Central America, and Southeast Asia.
In Puerto Rican cooking, recao is an essential ingredient in sofrito, the aromatic base made by blending recao, sweet peppers, onion, garlic, and sometimes tomato into a paste. Sofrito goes into beans, rice, soups, and braises. The herb is so fundamental to this preparation that sofrito made without recao tastes noticeably different. Dominican, Trinidadian, and Panamanian kitchens use it in similarly foundational ways.
In Vietnamese and Thai cooking, the leaves are typically used raw, sliced into thin ribbons and added as a garnish to pho, spring rolls, and salads. The leaves are sturdy enough to hold their texture even when dressed, unlike cilantro, which tends to go limp. In parts of India and Malaysia, recao appears in chutneys and curries.
A practical tip for anyone new to cooking with recao: start with less than you think you need. Because the flavor is two to three times more concentrated than cilantro, a couple of leaves can season an entire pot of soup. You can always add more, but overdoing it can overwhelm a dish with a soapy or metallic note, especially for people who are sensitive to aldehydes in the first place.
Why Recao Tastes Like Stronger Cilantro
The shared flavor between recao and cilantro comes down to a group of chemicals called alkenals and aldehydes. Both plants produce these compounds, but in different proportions. The dominant aroma molecule in recao is (E)-2-dodecenal, which makes up roughly 63% of the herb’s essential oil. Cilantro produces the same compound, but at lower concentrations, around 26%, with a wider mix of other aldehydes filling out the rest of its profile.1Journal of Horticulture and Postharvest Research. Comparative analysis of the odorants of cilantro (Coriandrum sativum L.) and culantro (Eryngium foetidum L.,) as aromatic crop mimics of family: Apiaceae That higher concentration of a single potent molecule is what makes recao hit harder.
Research comparing the volatile profiles of the two herbs found over 20 shared phytochemicals, with the major aroma compounds clustering into five distinct odor groups.3ACS Publications. Characteristic Aroma Components of the Cilantro Mimics So the plants genuinely smell similar for the same chemical reasons, not just because our noses lump them together. The practical upshot is that recao works as a direct substitute for cilantro in any recipe, just in smaller quantities. People who have the genetic variation that makes cilantro taste like soap may react the same way to recao, since the offending aldehydes are present in both herbs.
Storing Fresh Recao
Fresh recao leaves last longer than fresh cilantro, partly because the leaves are thicker and more resilient. Stored properly in the refrigerator, recao can stay usable for one to two weeks, sometimes longer. The simplest method is to wrap the leaves loosely in a damp paper towel, place them inside a zip-top bag with the air partially pressed out, and store the bag in the crisper drawer. The damp towel prevents dehydration while the bag limits exposure to dry refrigerator air.
An alternative method is to stand the stems in a jar of water, like a bouquet, cover the leaves loosely with a plastic bag, and refrigerate the whole setup. This tends to keep the leaves perkier for longer but takes up more fridge space. Change the water every few days if you go this route.
For longer storage, freezing works well. Chop the leaves finely, pack them into ice cube trays, top off with a little water or olive oil, and freeze. Each cube becomes a ready-made flavor addition for soups, stews, and rice. The texture will be soft after thawing, so frozen recao is best used in cooked dishes rather than as a fresh garnish. Another approach is to blend recao into a sofrito base and freeze the whole batch in portions, which gives you an instant flavor foundation whenever you need it.
Drying Recao and Preserving the Aroma
Drying is the traditional preservation method in many regions where recao grows, but drying conditions matter enormously for flavor retention. The volatile oils that give recao its characteristic aroma are sensitive to heat and direct sunlight. Research on solar drying methods for recao in the Peruvian Amazon found that indirect solar drying, where the herb is shielded from direct sun exposure while still benefiting from solar-generated heat, produced a dried product that more closely resembled the fresh herb in both chemical composition and appearance compared to direct sun drying.4Journal of Food Process Engineering. Effect of Solar Drying on the Composition of Essential Oil of Sacha Culantro (Eryngium foetidum L.) Grown in the Peruvian Amazon
For home drying, this translates to a straightforward recommendation: dry recao in a warm, airy spot out of direct light. A food dehydrator set to its lowest temperature (around 95–105°F or 35–40°C) works well. You can also tie small bundles and hang them in a shaded, ventilated area for a few days. Oven drying at anything above about 150°F risks driving off the very compounds you are trying to preserve. Once fully dry, the leaves should crumble easily. Store them in an airtight jar away from light and heat. Dried recao loses potency faster than some other dried herbs, so use it within a few months for the best flavor.
Growing Recao Indoors
Recao is one of the better herbs for indoor growing precisely because it does not need intense light. A windowsill that gets a few hours of indirect light per day is adequate. Under grow lights, keep the intensity moderate and the light cycle to about 12 hours. Longer photoperiods can push the plant toward bolting, as mentioned earlier, so imitating the short day lengths of the tropics works in your favor.
Use a pot at least six inches deep with good drainage. A standard potting mix amended with a little extra peat or coco coir for moisture retention is a good choice. Water when the top half-inch of soil feels dry to the touch, which in a typical indoor environment means every two to three days. Misting the leaves occasionally can help if your home is dry, particularly in winter when heating systems pull humidity out of the air.
One advantage of indoor recao is that you can stagger plantings. Start a new pot from seed every month or two, and by the time your first plant bolts, the second is hitting its stride. This rolling harvest approach keeps you supplied year-round, which is especially useful in colder climates where outdoor growing is limited to a few summer months.
Common Mistakes and Misconceptions
The most common mistake new growers make is giving recao too much sun. Because it is an herb, people instinctively put it in their sunniest garden spot next to the basil and rosemary. Recao in full sun looks stressed within days: the leaves bleach, curl, and the plant races to flower. Moving it to shade is the single most impactful change you can make if your plant is struggling.
A widespread misconception is that recao and cilantro are interchangeable in equal amounts. They are substitutes in terms of flavor direction, but not quantity. A recipe calling for half a cup of chopped cilantro might need only two or three recao leaves to achieve a comparable flavor intensity. Using a full half cup of chopped recao would almost certainly overpower the dish.
Another misconception involves the plant’s hardiness. Because recao grows aggressively in the tropics and can even become weedy in warm, humid areas, some growers assume it is tough under any conditions. It is not. Recao has virtually no cold tolerance and grows poorly in dry air. In arid climates like the American Southwest, it needs constant attention to moisture and is best kept in a container where you can control the microenvironment.
Recao’s Role in Traditional Medicine
Beyond the kitchen, recao has a long history of use in folk medicine across the Caribbean, South America, and Southeast Asia. Its essential oil, dominated by (E)-2-dodecenal, has been the subject of pharmacological screening for a range of potential bioactivities.5Borneo Journal of Pharmacy. Pharmacological screening of Eryngium foetidum Linn – A Review Traditional uses have included preparations for digestive complaints, fevers, and as an anti-inflammatory poultice. In Trinidad, shadow beni tea made from the leaves is a traditional remedy for colds and upset stomachs.
It is worth approaching these traditional uses with some calibration. The fact that a compound shows activity in a lab screen does not mean that eating the herb in normal culinary amounts delivers a therapeutic dose. Recao is a food first, and its health benefits at the dinner table are more about the micronutrients you get from eating green leafy herbs regularly than about any single pharmacological compound. The leaves do contain calcium, iron, carotene, and riboflavin in meaningful amounts for a fresh herb, which makes them a worthwhile addition to your diet beyond their flavor contribution alone.