{"product_id":"planterhoma-18-lb-horticultural-lava-rocks-3-6-mm-for-succulents-bonsai-hydroponics-improved-drainage","title":"Planterhoma 18 lb Horticultural Lava Rocks 3–6 mm for Succulents, Bonsai \u0026 Hydroponics — Improved Drainage","description":"\u003cp\u003e\u003cstrong\u003ePlanterhoma 18 Pounds Mix Horticultural Lava Rocks are small, porous 3–6 mm volcanic grit designed to improve pot drainage, aeration, and surface top-dressing for succulents, bonsai, terrariums, and hydroponic setups.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese mixed-color lava rocks give indoor and outdoor plantings a durable, low-maintenance layer that resists decomposition and supports healthier root environments. Their natural porosity helps water move through soil while trapping air around roots; the pebble-sized 3–6 mm range works well for shallow-rooted plants, decorative top dressings, and medium-fine hydroponic substrates. Supplied ready to use, the 18-pound bag covers multiple pots and projects, making it a practical pick for hobby gardeners and professional growers alike.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these lava rocks help my potted succulents and cacti?\u003c\/h3\u003e\n\u003cp\u003eThe porous structure of volcanic grit increases drainage and prevents soil from staying overly wet, which is especially important for succulents and cacti. A thin layer on the soil surface reduces evaporation, deters soil compaction, and limits fungus gnats.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eImproves drainage by channeling excess water away from roots.\u003c\/li\u003e\n  \u003cli\u003ePrevents soil crusting and compaction around root crowns.\u003c\/li\u003e\n  \u003cli\u003eActs as an attractive, long-lasting top dressing that reduces pests.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use these rocks in hydroponics, terrariums, or bonsai containers?\u003c\/h3\u003e\n\u003cp\u003eYes — the 3–6 mm size is versatile for many small-scale systems: it provides stable anchoring for shallow roots, allows nutrient solution flow in hydroponics, and gives bonsai soil better aeration without breaking down over time. Rinse before use to remove dust for the clearest results in enclosed displays or water-based systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHydroponics: promotes good water and air flow around roots.\u003c\/li\u003e\n  \u003cli\u003eTerrariums: decorative, non-degrading surface that resists mold.\u003c\/li\u003e\n  \u003cli\u003eBonsai: enhances soil structure while maintaining a stable root base.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the maintenance and longevity benefits of using Planterhoma lava rocks?\u003c\/h3\u003e\n\u003cp\u003eUnlike organic mulches, volcanic rock is inorganic and won’t decompose, meaning you don’t have to replace it seasonally. It stays chemically inert in most potting media and retains its texture, so it keeps providing drainage and aesthetic value for years.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDoes not rot or attract pests like organic mulches can.\u003c\/li\u003e\n  \u003cli\u003eRequires only occasional rinsing to remove dust or salts.\u003c\/li\u003e\n  \u003cli\u003eDurable for outdoor and indoor installations, including fire pits and containers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this product for? Planterhoma mixed horticultural lava rocks are made for plant lovers who want a long-lasting, low-maintenance solution to improve soil drainage, reduce surface evaporation, and add visual appeal. They suit succulent and cactus growers, bonsai enthusiasts, terrarium creators, hydroponic hobbyists, and DIY decorators who need an inert, decorative substrate. If you’re updating potting mixes, building a fairy garden, or arranging glass vases and planters, these 3–6 mm lava rocks provide functional support and a tidy, natural finish.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need to wash these lava rocks before using?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Rinse is recommended to remove dust and fines; washing ensures clearer water in terrariums and hydroponic systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will these rocks change soil pH over time?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No, Planterhoma horticultural lava rocks are largely inert and generally do not alter soil pH.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Planterhoma","offers":[{"title":"Default Title","offer_id":56830775329108,"sku":"B0DC3664LR","price":96.75,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/planterhoma-front-of-bag.jpg?v=1787007680","url":"https:\/\/gardenluxe.co.uk\/products\/planterhoma-18-lb-horticultural-lava-rocks-3-6-mm-for-succulents-bonsai-hydroponics-improved-drainage","provider":"Gardenluxe Uk","version":"1.0","type":"link"}