rockwool mold — Does Rockwool Mold? Preventing Mold on Grow Cubes

Rockwool mold is usually a harmless-looking layer of white fuzz or green algae on the surface of rockwool cubes, caused by constant moisture, light hitting the cube, warm stagnant air, and organic residue such as nutrients or decaying roots. White fuzz is often saprophytic mold feeding on residue; green film is algae. Neither is necessarily killing your plant, but both signal conditions that also favor damping-off, fungus gnats, and root rot. Fix it by letting the surface dry slightly between waterings, covering cubes from light, improving airflow, and starting with clean, properly pre-soaked rockwool.

hydroponic ginseng — Hydroponic Ginseng: Can You Grow Ginseng Without Soil?

Can you grow hydroponic ginseng? Yes, mostly as a research and specialty crop. Hydroponic ginseng is usually grown from one-year-old roots in aerated nutrient tanks under low light at about 68–72°F (20–22°C). Studies show it can produce leaves and young roots rich in ginsenosides within weeks, but it won’t replace the multi-year roots sold as traditional ginseng.