Substrate intended to serve as a culture support, characterized: * on the one hand, because it comprises: - a first part, which constitutes the structure of the substrate and represents more than 70% of the total volume of said substrate, composed of particles P>； 100 μm； with a particle size greater than 100 μm, the set of said particles consists of hard particles PD>； 100 and cork particles PR>； 100, said cork particles constitute a volumetric proportion PV between 5% and 90% by volume of this first part； - a second part of corpuscular elements P <；100 with a particle size of less than 100 μm, and constituting from 0 to 450 g / l of said substrate； - a third part, which constitutes from 0 to 200 g / l of said substrate, composed of fine fibers with a length between 3 mm and 100 mm and a diameter between 5 μm and 35 μm； - a quarter, which constitutes from 0 to 200 g / l of said substrate, composed of other elongated and / or superficial inclusions, each of these elongated or superficial inclusions has at least one of its dimensions considerably greater than the particle size of the particles of the first part； * on the other hand, because the sum of the dosages of the third part and the fourth part is greater than 1 g / l of said substrate.Sustrato destinado a servir como soporte de cultivo, caracterizado: * por una parte, porque comprende: - una primera parte, que constituye la estructura del sustrato y que representa más del 70 % del volumen total de dicho sustrato, compuesta por partículas P>；100 μm； con una granulometría superior a 100 μm, el conjunto de dichas partículas está constituido por partículas duras PD>；100 y partículas de corcho PR>；100, dichas partículas de corcho constituyen una proporción volumétrica PV comprendida entre 5 % y 90 % en volumen de esta primera parte； - una segunda parte de elementos corpusculares P<；100 con una granulometría inferior a 100 μm, y que constituye de 0 a 450 g/l de dicho sustrato； - una tercera parte, qu
