Graviers et galets décoratifs : guide des couleurs et usages
Réponse rapide : le gravier et le galet décoratif se choisissent selon trois critères : la couleur (pour s'harmoniser avec la façade ou les plantes), la taille du grain (plus fin pour les pots et terrariums, plus grossier pour les allées et zones de passage) et l'origine du matériau (marbre, calcaire, granit ou recyclé). Pour les jardins peu exigeants en entretien, n'importe quel gravier convient comme paillis minéral ; pour les aquariums et terrariums, il existe des références spécifiques lavées et sans arêtes.
Guide rapide par couleur et usage
Quelle quantité de gravier prévoir
À titre indicatif, pour une couche décorative d'environ 5 cm d'épaisseur, il faut environ 50 kg de gravier par mètre carré. Pour les allées à passage plus fréquent, augmentez l'épaisseur à 7-8 cm et recalculez la quantité proportionnellement.
Associez-le au reste du jardin
Délimitez les zones de gravier avec des bordures en béton ou associez-les à des dalles en béton pour créer des allées praticables.
Questions fréquentes
Le gravier décoratif empêche-t-il la pousse des mauvaises herbes ?
Il en réduit la pousse en bloquant la lumière, mais pour un contrôle plus efficace, il est recommandé de poser un géotextile anti-mauvaises herbes sous la couche de gravier avant de l'étaler.
Puis-je mélanger plusieurs couleurs de gravier dans le même jardin ?
Oui, c'est une astuce décorative courante pour délimiter des zones distinctes (par exemple une couleur pour l'allée et une autre pour les massifs), à condition que les tailles de grain soient similaires.
Quel gravier convient pour un aquarium ?
Seul le gravier spécifiquement lavé et sans arêtes coupantes, conçu pour ne pas blesser les poissons ni modifier le pH de l'eau ; il ne faut pas utiliser de gravier décoratif de jardin dans un aquarium.
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