Crithmum maritimum L. (sea fennel) is a perennial halophyte with high ecological, nutritional, and socio-economic value whose domestication offers concrete solutions for saline and water-limited farming systems. This article synthesizes the state of knowledge on the species (taxonomy, morphology, ecology, distribution, and uses) and delivers a step-by-step cultivation protocol tailored to Tunisian conditions, integrating peer-reviewed literature with original experimental trials (INRGREF; IRA Médenine). It provides details seed biology (including successful germination without pre-treatments, >70% within 10–15 days under greenhouse conditions), vegetative propagation options, and agronomic practices (site/soil selection, spacing, drip irrigation and salinity/EC management, fertilization, canopy and stress management). Field insights confirm robust establishment from sub-humid coasts to arid, saline environments, with operational recommendations such as optimal transplant size (≈20 cm) and the feasibility of direct seeding (emergence ≈7 days). Post-harvest handling and storage guidelines are provided for fresh and processed uses, alongside perspectives on value-chain development for food, nutraceutical, cosmetic, and ecological restoration markets. This study positions C. maritimum as a climate-resilient crop for biosaline agriculture and a lever for biodiversity conservation and rural development in the Mediterranean.

Crithmum maritimum L., sea fennel, domestication, halophyte crops, seed propagation, vegetative propagation, agronomic practices, biosaline agriculture, climate-resilient agriculture, Tunisia.