High porosity growing medium

PRO-MIX® HP® BIOFUNGICIDE™ + MYCORRHIZAE™ is perfect for growers that require a growing medium with good drainage, high air porosity and low water retention. The combination of fibrous Sphagnum peat moss and a high percentage of coarse perlite makes this formulation ideal for growers who require a growing medium product that is adapted to their needs for watering flexibility and crop seasonality. PRO-MIX® HP® BIOFUNGICIDE™ + MYCORRHIZAE™ contains Bacillus, a bacterium that reduces the incidence of certain root diseases, and mycorrhizae, a beneficial endomycorrhizal fungus that improves plant growth.


  • Dries out more frequently than general-purpose peat‑based mixes
  • Well suited for low-light and high-humidity growing conditions
  • More difficult to overwater crops
  • Reduces incidence of water-related problems (root diseases, algae and fungus gnats)
  • Holds less water for improved leaching of fertilizer salts during crop cycles
  • Accelerates seed germination and plant establishment
  • Reduces the need for fungicide drenches 
  • Reduced incidence of plant root disease
  • Encourages healthy plant root systems
  • Enhances nutrient and water uptake 

More from the PRO-MIX® HP® family


Recommended Usages

Ornemental Ornamental

Foliage plants
Potted flowering plants

Controlled-environment agriculture Controlled-Environment Agriculture

Greenhouse vegetables
Vegetable transplants
Young plant propagation


Inert ingredients

  • Sphagnum Peat Moss (65-75%)
  • Perlite
  • Calcitic and dolomitic limestone
  • Wetting Agent


PRO-MIX® HP® BIOFUNGICIDE™ + MYCORRHIZAE™ protects plants against pathogens* and reduces the incidence of root diseases, while increasing plant growth, survival and productivity.

  • Forms a protective physical barrier around the expanded root system
  • Protects plants against pathogens and reduces disease incidence*
  • Boosts plant growth and productivity

* Suppress root diseases caused by specific pathogens (such as Pythium, Fusarium and Rhizoctonia), and also suppress fungus gnats and thrips.

Physical Properties

Particle Size: 

Air Porosity: 

Water Holding Capacity: 

Bulk Density: 

Code Size Units per pallet Weight
2028500RG 2.8 cu ft Loose 57 25 - 35 lb


3.8 cu ft Comp. 30 60 - 75 lb
2080500RG 80 cu ft Loose 2 700 - 850 lb
2135500RG 135 cu ft Comp. 1 2200 - 2700 lb
"For some of our crops, we have moved away from using any kind of preventative bio-fungicides other than what’s in PRO-MIX®."

Moose Mountcastle
Garden Gateway

Read their story

promix-greenhouse-growing-the-garden-gateway-header (1).jpg
"[Premier Tech Growers and Consumers] works very hard to get us what we needed when we needed it. [They] take all the risk out of it."

Bill Boonstra
Bluestone Perennials

Read their story


Logo Veriflora

Veriflora Responsibly Managed Peatlands

Premier Tech’s peat moss comes from bogs that are certified under the Veriflora Program. This certification ensures the application of good management principles in all aspects of sustainable development. The criteria include environmental assessment, social engagement, and product quality.

Download certificate

Premier Tech, the Company Behind the Brand

Experts at your Service

Our dedicated team of experts is committed to ensuring that professional growers maximize the potential of PRO-MIX® products. We offer comprehensive support to help you enhance your expertise and achieve optimal results in your cultivation endeavors.

Learn more

Premier Tech Growers and Consumers Unmatched consistency
Premier Tech Growers and Consumers Superior quality

Superior Quality

We meticulously choose each element of our products, from the carriers to the biological active ingredients, and all other components in between. Our rigorous quality control spans from the bio fermenters to the final formulated products, ensuring every aspect meets our high standards. This meticulous attention to detail offers you peace of mind, knowing you're receiving only the finest quality products.

Unmatched Consistency

Our beneficial microorganisms are seamlessly integrated into our growing media. We meticulously verify the viability and efficacy of each batch produced, guaranteeing that your chosen product maintains its quality and delivers consistent results every time.

Ask for a demo

Expert service

Frequently Asked Questions

To use PRO-MIX® HP®, open the package, remove some PRO-MIX® product and place into a large tub or container. Lightly break up any clumps so that the PRO-MIX® is light and airy. Most growers prefer to add a small amount of water prior to filling containers. If you add water, add enough so that the PRO-MIX® product is slightly moist to the touch. Do not saturate. Fill flats, containers and/or pots, without compacting the PRO-MIX® in the container. Plant your seedlings, young plants, etc., then water in containers.

Using the Saturated Media Extraction test method (SME), PRO-MIX® HP® is formulated in a pH range of 5.2-6.2. Once the product is opened, crops planted and watered, limestone is activated and pH will reach 5.8-6.2 within 7-10 days.

We do not recommend reusing PRO-MIX® HP® or any growing medium. There are many good reasons not to reuse, including changes to chemical and physical properties over time, diminished effect of wetting agent after use and/or transmission of root diseases to newly planted crops.

When irrigating, add water to PRO-MIX® HP® until it is saturated from top to bottom of the container. You will know you have accomplished this when water runs out of the drainage holes at the bottom of the container. Over time, allow the growing medium to dry-out without applying additional water. You will know when to apply water again when the surface of the growing medium turns color from a dark brown/black (wet) to a light brown/tan color (dry enough to rewater).

Yes, PRO-MIX® contains a starter fertilizer to help plants acclimate to a new rooting environment. We strongly recommended to initiate a fertilizer program within 7-10 days after planting. The fertilizer program you select should take into consideration water quality, crop type and the stage of plant growth.

PRO-MIX® HP® can be used for transplanting seedlings. However, we suggest PRO-MIX® FPX for seed starting and seed germination.

PRO-MIX® HP® is a peat-based growing medium formulated with a high percentage of perlite. PRO-MIX® HP® and all PRO-MIX® growing media products are 'soilless', meaning that they do not contain any mineral soil.

Haven't found the answer to your question?
We are here to help you!

Contact us

Similar Products