BK25 MYCORRHIZAE* – Peat/Bark based growing medium

PRO-MIX BK25 MYCORRHIZAE is a medium-weight growing medium designed for the cultivation of greenhouse horticultural crops in 4” pots or larger. The combination of processed southern pine bark, sphagnum peat moss and perlite makes for a general purpose product that provides good drainage and low water retention capacity.

*Exclusive to Eastern United States. Offered in a generic bag. Consult your sales representative for more information.

Where to find our products

Questions to our experts


  • Potted flowering plants
  • Foliage plants
  • Plug & Germination
  • Perennials
  • Nursery


  • Good drainage, low water retention
  • For a wide variety of greenhouse crops
  • Higher container stability than peat-based mixes
  • Suitable for bedding plant trays to medium size pots

Active Ingredients


  • Improves fertilizer uptake; reduces fertilizer costs
  • Increases the resistance of plant to stresses; reduces maintenance costs
  • Optimizes results without changing growing practices
  • Increased root mass, flower production, plant size, yield
  • Improved water uptake and increased drought resistance
Troy Buechel Horticulture Specialist

Advice from our specialist

PRO-MIX BK25 contains 25% processed bark, Canadian Sphagnum peat moss and perlite and is ideal for greenhouse crops grown in bedding trays to medium size containers.

Our PRO-MIX peat-bark based blends contain various amounts of partially composted and aged southern pine bark to provide low water retention, high drainage, good air porosity and added bulk density for container stability.

See more

Training center


  • SPHAGNUM PEAT MOSS (50-60%) ?

    Canadian Sphagnum peat moss is a natural, organic matter that comes from a peat bog. This primary resource is carefully harvested by vacuum harvesters. Peat moss comes in various fibrosity and levels of decomposition. Once carefully graded, peat moss assures that qualities of each grade are optimized for based on grower and uses for a final product reaching high quality requirements.


    PRO-MIX BK25, BK55 and NCX are formulated with processed, aged yellow pine bark from the forests of the mid-Atlantic region of the US. This pine bark is screened, partially composted and aged to produce a coarse base ingredient for blending PRO-MIX growing media to add bulk density, drainage and air-porosity.


    Perlite is an alumino-silicate ore of volcanic origin. The raw ore is crushed, graded and screened in various particle sizes. Perlite has a high total-porosity and improves drainage and air porosity.


    Used to adjust pH to optimum range. Also a source of Calcium and Magnesium.


    A wetting agent is a substance that reduces the surface tension of water, allowing water to penetrate and uniformly wet growing media.


    PTB297 Technology, Glomus intraradices - Mycorrhizae are beneficial associations between a mycorrhizal fungus and roots, creating a network of filaments that explores the soil and access more nutrients and water, and transfer them to the plant.

Documents and specifications

Code Size (Regional availability may vary) Units per pallet Weight
5028125RG 2.8 cu ft Loose 48 45 - 50 lb
5060125RG 60 cu ft Loose 2 900 - 1100 lb
Also available in bulk
Size (Regional availability may vary) 2.8 cu ft Loose
Units per pallet 48
Weight 45 - 50 lb
Size (Regional availability may vary) 60 cu ft Loose
Units per pallet 2
Weight 900 - 1100 lb
Size (Regional availability may vary) Also available in bulk
Units per pallet

Your 2021 season full package

Get full access to all the information you need to start the season on the right foot.

Customer Service / Sales:
1 855 867-5407

Grower Services:
1 800 424-2554