Therm-O-Rock Vermiculite

This vermiculite acts as a moisture and nutrient reservoir. It absorbs water and releases it slowly to plant roots as needed, while simultaneously creating air pockets in the soil to prevent compaction and support healthy root respiration.

Yes, the medium-grade texture is excellent for seed starting. It provides enough structure to hold seeds in place while remaining light enough for delicate new roots to penetrate easily, and it helps keep the seed-starting medium consistently moist.

Absolutely. Because it is sterile and holds moisture well without becoming waterlogged, it is a popular choice for rooting cuttings. Just keep in mind that vermiculite lacks nutrients, so you will need to transplant your cuttings into a nutrient-rich soil mix once roots are established.

A common starting ratio is 1 part vermiculite to 3 or 4 parts soil, but you can adjust this based on your plants' needs. Use a higher concentration for moisture-loving plants and a lower concentration for those that prefer drier conditions.

No, vermiculite is a mineral-based amendment that does not decompose or break down like organic matter such as peat moss or compost. It will maintain its structure and aeration properties throughout the growing season.