Set of 8 Rockwool Cubes (4" x 4" x 4") - Ideal for Tomato Bucket Replacement

Horticultural Rockwool Plug

Food safe UV resistant asbestos-free horticultural Rockwool made from basalt (volcanic rock) commonly used to make:

• Horticultural growing cubes for growing hydroponic food commercially
  
• Horticultural growing plugs for starting hydroponic seeds commercially
• Widely accepted and used in both the commercial and also the hobbyist hydroponic community
• Rockwool is not a plastic sponge (kitchen sponge), so please don't substitute Rockwool with a plastic sponge (which can be toxic)!
• Rather, Rockwool is a stone sponge made out of basalt (volcanic rock) melted and then spun into fiber
• Because Rockwool is basically a really puffy rock, it is chemically inert, UV-resistant, and safe for growing food according to ChatGPT, Google, Bing AI, and FDA (Food and Drug Administration)