Miller Container Planting Soil Mix

Our Container & Nursery Mix is a well-draining soil blend designed for professional plant production, container plantings, and specialty propagation. This mix was originally developed and continues to be used by the Elizabeth Miller Botanical Garden, where reliable drainage and long-lasting soil structure are essential.
 
Made from chunky aged bark, pumice, and compost, this blend provides the ideal balance of air space and moisture retention. The mix holds only the moisture necessary at the root tips while allowing excess water to drain quickly, helping prevent root rot and encouraging strong root systems.
 
This soil contains a complete natural micronutrient profile from its organic ingredients, but no added synthetic or supplemental macronutrients, giving growers the flexibility to fertilize according to their specific plant needs.
 
The durable structure of the bark and pumice allows the soil to maintain its integrity in containers longer than many traditional mixes, reducing the need for frequent soil replacement.
 
Main Use Cases
Container plantings
Nursery production
Native plant propagation
Seed germination
Grafting plants
Amending planting soils for improved drainage
 
Ingredients
Chunky aged bark
Pumice
Compost
 
Key Benefits
Superior drainage for healthy root development
Long-lasting soil structure in containers
Proven performance for over 20 years
Encourages strong, resilient plant growth
Flexible fertilization program (no added macro fertilizers)
Highly versatile for many planting applications