What is coriander
Coriander (Coriandrum sativum) is an annual herbaceous plant native to the Mediterranean area, appreciated for centuries both as a flavoring in cooking and as a herbal remedy. It is part of the Apiaceae family, the same as parsley, fennel and carrot, and is characterized by erect stems, slightly incised basal leaves and upper leaves very similar to those of parsley, so much so that it is easily confused with it at first sight.
In summer, starting from June, the plant produces small white or pink flowers arranged in umbels, a typical structure of all Umbrelliferae. After flowering, the fruits appear, each containing a single seed, which represent one of the most used parts of the plant in the herbal field. Very simple to grow both in pots and in the ground, coriander is one of those plants that is always worth having on hand, on the balcony or in the vegetable garden.
The varieties of coriander
There is no single variety of coriander: there are several on the market, each with slightly different characteristics in terms of growth, resistance and flavour. The Slow Bolt variety is among the most appreciated by those who grow in pots or in hot climates, because it tends to flower later than others, guaranteeing longer leaf production. The Santo variety, on the other hand, is very widespread in home gardens thanks to its rapid growth and good yield of aromatic leaves. Calypso is an interesting choice for those looking for a more compact plant, suitable for small spaces and container cultivation.
Choosing the right variety for your growing context makes a real difference, especially if your goal is to harvest fresh leaves for as long as possible before the plant enters the flowering phase.
When to sow coriander
Coriander is sown starting from March-April, continuing until the beginning of summer, placing the seeds about five centimeters deep in already prepared and well-drained soil. The seeds have good germination: by keeping the substrate constantly moist, the first seedlings will emerge within one or two weeks of sowing.
Coriander prefers calcareous soils, but adapts well to a good pH range and different types of soil, as long as there is no water stagnation. The essential condition is light exposure: without a good amount of light, coriander grows stunted and tends to flower early, reducing the availability of aromatic leaves. Once the seedlings have reached five centimeters in height, cultivation becomes very simple and requires little regular attention.
How to grow coriander in pots and in the garden
Coriander lends itself well to both solutions: it can be grown in the garden or vegetable patch, or in a pot on the balcony or on the windowsill of a window facing south or east, where it receives abundant morning light. However, it is important to avoid leaving the plant exposed to direct sun during the hottest hours of the summer afternoon, as the leaves would tend to burn and shrivel quickly.
Irrigation must be modulated according to the season and temperatures: in the hot season, especially on the hottest days, coriander should be watered in the evening whenever the soil is excessively dry. Care must be taken not to exaggerate with the quantity of water and to always empty the saucer, because stagnation is the main cause of deterioration of the roots.
As for fertilizing, if coriander is growing in open ground with already rich soil, fertilizer additions may not be necessary. In pots, however, the plant tends to quickly exhaust the nutrients available in the substrate, so regular fertilization at least twice a month with a balanced liquid fertilizer is advisable.
Those who grow coriander in the vegetable garden will find it beneficial to place it near mint, oregano, chive plants, or next to tomatoes and summer salads, with which it coexists very well and can help to ward off some unwanted insects.
Being an annual species, after the production of seeds the plant naturally concludes its life cycle. It is possible to prolong it by eliminating the flowers as soon as they appear, so as to delay the maturation of the seeds and maintain the production of leaves for longer. This practice, however, reduces the resources available for bees and ladybugs who willingly visit flowering coriander plants: a consideration to keep in mind especially for those who grow in the garden with an eye on biodiversity.
Common problems, pests and diseases
Like all aromatic plants, coriander can also encounter some problems during cultivation. Among the most frequent parasites are aphids, small insects that colonize the apical shoots and the most tender leaves, sucking the sap and progressively weakening the plant. In case of light infestation it is sufficient to intervene with a strong jet of water or with an emulsion of water and Marseille soap. In more serious cases, natural insecticides based on pyrethrum or neem oil can be used.
Powdery mildew, commonly called white mildew, is a fungal disease that manifests itself with a white-dusty coating on the leaves and stems, especially in conditions of high humidity and poor ventilation. To prevent this, it is important not to water the leaves directly and always ensure good air exchange between the plants.
Root rot, on the other hand, is the direct consequence of water stagnation in the pot or in the soil: the roots deteriorate, the plant yellows and collapses rapidly. It is generally not recoverable except in a very early stage, reducing watering and, if possible, repotting the plant in a dry and fresh substrate.
How to collect and preserve leaves
Coriander is ready to harvest when the stems reach a height of about twenty centimeters. The harvest is carried out by taking the lowest leaves, so as not to compromise the growth of the plant and guarantee continuous production over time. The flowers can also be used in cooking, although they are much less tasty than the leaves.
Fresh coriander leaves can be stored in the refrigerator for three or four days wrapped in a slightly damp sheet of kitchen paper, or with the stems immersed in a glass of water as is done with parsley. To preserve them for longer it is possible to dry them in a dry and shaded place, or freeze them directly after having washed and dried them: in this case they lose their consistency but retain a good part of the scent and can be used directly in hot preparations.
The seeds are harvested when the plant begins to yellow: a part can be saved for the following season, keeping in mind that they remain germinable even five years after harvesting if stored in a cool, dry place away from light.
How to use it in the kitchen: leaves, flowers and seeds
Fresh coriander leaves have a very characteristic, pungent and slightly citrusy flavour, which clearly divides those who love it and those who find it unpleasant. They are the protagonists of many cuisines around the world, from Mexican to Thai, from Indian to Middle Eastern, and are mainly used raw to preserve their aroma.
Among the most classic uses are guacamole, where fresh coriander is a fundamental ingredient, the traditional Indian green chutney prepared by blending leaves, garlic, chilli pepper and lemon juice, and Argentine chimichurri, the accompanying sauce for grilled meats. Paired with chickpea hummus or as a garnish for soups, curries and vegetable side dishes, fresh coriander adds an intense and recognizable aromatic note.
The flowers, much more delicate in flavour, lend themselves well to summer salads, waters flavored with fruit and ice, or as a decoration in cold dishes.
The seeds, with their warm, spicy scent reminiscent of dried orange, are widely used in European and Eastern cuisine to flavor breads, cured meats, marinades and pickled preserves. In herbal medicine they are instead used for their digestive properties: they facilitate slow digestion, reduce abdominal swelling and cramps caused by excess intestinal gas. The herbal tea is prepared with two teaspoons of slightly crushed fruits left to infuse in 150 milliliters of boiling water for about fifteen minutes. It is taken as needed or after main meals.
Coriander vs parsley: how to tell them apart
One of the most common mistakes among those who are approaching the cultivation of aromatic herbs is to confuse coriander with parsley, especially in the young phase of the plant, when the upper leaves of coriander take on a shape very similar to that of smooth parsley. The easiest way to distinguish them is to use your nose: by lightly rubbing a leaf between your fingers, coriander immediately releases its unmistakable, strong and citrusy scent, while parsley has a fresher, herbaceous and neutral aroma. Color can also help: coriander leaves tend to be a slightly lighter and glossier green than parsley leaves.
Cilantro FAQ
Is coriander bad for you?
Cilantro is generally safe and well tolerated when consumed in quantities normally used in cooking. In rare cases, in particularly sensitive subjects, it can cause allergic reactions, especially in those who are already allergic to other plants of the Apiaceae family such as celery, carrot or fennel. Use as a herbal remedy in herbal tea is safe for most people, but it is preferable to consult a doctor or herbalist before using it regularly and for a long time, especially during pregnancy or breastfeeding.
How often do you water coriander?
There is no single answer because it depends on the season, temperature and type of cultivation. Generally speaking, during the hot season it is sufficient to water in the evening every two or three days, always checking that the soil is not yet deeply damp before adding more water. In winter, if the plant is kept in a cool environment, watering is drastically reduced or almost completely suspended.
Can coriander be grown all year round?
Not in the open ground or outdoors: being an annual plant, its life cycle ends with the production of seeds and it does not survive winter temperatures. However, by keeping the potted plant in a bright indoor environment with mild temperatures, it is possible to prolong its life even in the cold months. By sowing in steps every three or four weeks from March to July it is possible to have fresh leaves available throughout the summer.
Why does coriander flower immediately?
Early flowering, called bolting, is one of the most common problems in coriander cultivation and occurs when the plant is subjected to stress: excessive heat, lack of water, too direct light in the hottest hours or abrupt transplants can accelerate the process. Choosing Slow Bolt varieties, placing the plant in a partially shaded position during the hottest hours and keeping the soil constantly moist are the most effective strategies to delay flowering and prolong leaf production.
Are coriander seeds and coriander the same thing in cooking?
Yes and no: they come from the same plant, but they have very different flavors. The fresh leaves have a strong, herbaceous, citrusy aroma that many people find divisive. The dried seeds, however, have a completely different aromatic profile, warm, spicy and slightly sweet, similar to dried orange and toasted lemon peel. This is why those who can’t stand the taste of fresh leaves might find the seeds perfectly pleasant, and vice versa.
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