Coriandrum sativum Seeds | Cilantro
LATIN NAME: Coriandrum sativum
COMMON NAME: Cilantro
Plant Profile
The annual carries broad, flat, deeply divided lower leaves that look almost like flat parsley, then finer, thread-like upper leaves higher on the branching stem, a leaf-shape shift called heterophylly. In early summer it lifts small, flat-topped umbels of white to pale-pink five-petalled flowers, which give way to the rounded, ribbed, pale-brown seeds with their strong warm scent. The whole plant is feathery, fast, and openly branched.
Cilantro sits beside parsley and dill in the carrot family, but its fruits are globular and strongly ridged rather than flattened, and its foliage carries the unmistakable volatile scent absent from parsley. The flower umbels are looser and the seeds release their aroma only when crushed, which is why the seed and leaf are handled as separate commodities in every market from Mexico to India.
Science & Biotechnology
The split personality of the plant is pure chemistry: the leaf and the seed are dominated by different classes of volatile compound, which is why they never taste the same.
The fresh leaf owes its characteristic odour to aldehydes, especially (E)-2-decenal and (E)-2-dodecenal, which some people perceive as pleasant and others as soapy because of a genetic variation in the olfactory receptor OR6A2. This hereditary quirk explains why cilantro divides dinner tables more than almost any other herb, and why the leaf is best used raw or at the very end of cooking.
The dried seed tells a different story, dominated by linalool and geraniol with support from geranyl acetate, gamma-terpinene, and a touch of camphor, a soft, sweet, citrus-floral profile that has nothing of the leaf’s aldehydes. These compounds are what make ground coriander a backbone of curry blends and a smooth counterpoint to chilli, and they survive the dry, warm distillation that captures the seed oil. Ancient texts list coriander among the spices of the kitchen garden, and its seed has turned up in archaeological layers beside other traded spices, evidence of a very long human partnership with the plant.
Uses & Benefits
Cilantro is the rare crop traded as two completely different spices: the fresh green leaf is the herb cilantro, while the same plant’s dried seed is the spice coriander, and the two taste nothing alike. The leaf smells bright and soapy to some eaters and citrusy to others, a divide traced to a single olfactory receptor, while the seed smells warm, sweet, and faintly floral. Few plants ask a cook to learn two flavour vocabularies from one root.
From salsa to curry to the pho bowl, the leaf and the seed travel under different names but come from the same plant. Knowing which part to use is the whole trick.
Chopped leaf finishes a Mexican salsa, a Thai curry, and a Vietnamese noodle bowl, where its bright note cuts richness and lifts herbs. Because heat destroys the aldehydes, the leaf is stirred in off the flame so the aroma stays sharp and green.
The whole seed is toasted in a dry pan to wake its linalool and geraniol, then ground into masalas, rubbed on roast meats, or simmered in pickling brine. The gentle warmth of the seed pairs with cumin and caraway and rarely overwhelms a dish the way too much leaf can.
Growing from Seed
Cilantro runs to flower in heat, so it is sown for the cool shoulders of the year and cut often to delay the seed head. A firm, fertile, well-drained medium of loam, compost, and sand keeps the taproot happy.
Press the round, ribbed seed into a firm, moist seedbed and cover it with a shallow layer of fine soil, because the seed needs darkness and contact to sprout evenly. Keep the surface damp but not wet, and sow in short succession so a fresh row is always ready as the old one bolts.
Thin when the seedlings show their second true leaf, pulling the weakest to leave a finger’s width between plants; reach a final spacing near eight centimetres once they carry five true leaves and a slender stem. Cut the outer stems often to keep the plant in leaf rather than flower, and let one row run to seed for the spice jar.
Our Take
I sow cilantro in waves from spring through autumn so the salsa bowl is never empty. The Santo Cilantro Coriandrum sativum and the Longstanding Cilantro Coriandrum sativum stretch the harvest, the Leisure Cilantro Coriandrum sativum ‘Leisure’ resists heat, and the Parsley seed is the carrot-family neighbour to grow beside it.
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