Finding the Right Growing Medium to Propagate Plant Cuttings
Thursday, September 15, 2022
Young plant production continues to be a growing segment of the horticulture industry. Over the last several years, many producers have moved from seed germination to cutting propagation. This has become popular for specialty varieties and branded plants. While young plants are still produced with seed germination and plugs systems, the propagated and rooted cutting market has evolved into new processes with specialized equipment. Several companies have developed machinery to wrap paper and other materials around growing medium to form small pots.
Characteristics of Paper-Wrapped Pots for Propagating Cuttings
These miniature pots are available in assorted diameters, ranging from 15 mm up to 120 mm (5/8” – 4.75”). They represent an interesting practice for organic cultivation as some of these paper-wrapped pots are 100% bio-degradable. They are made by extruding growing medium into ‘tube-shaped’ outer wrapper and gluing the seam inside the wrapped tube. When the medium “tube” is filled, the paper-wrapped tube is cut into a specific length to form paper pots that are placed into individual cells within a growing tray.
The smaller size paper-wrapped pots (15-35 mm) are used mostly for cutting propagation. Larger sizes are used for propagation of greenhouse foliage, woody ornamentals for nursery and ready-plant annuals for the landscape trade. There are different needs for growing medium for each of these applications.
Rosemary cuttings rooted in 25mm paper-wrapped cells. Source: Premier Tech
A Machinery That Requires a Growing Medium Free of Sticks
With these types of pots, the growing medium must be free of sticks to avoid tearing the wrapping or damaging the saw blades that cut each pot. Clean product works better with automated machinery and there are fewer worries of bridging small cells with plug trays. Most growers prefer a fibrous growing medium that has good air porosity. It is a challenge for peat moss producers to remove all sticks and small tree roots from Sphagnum peat moss, because they are found naturally, and the challenge is to screen out this debris while retaining the fiber of the peat moss to have a well-structured growing medium.
The industrial division of Premier Tech, Premier Tech Systems and Automation, has developed an improved screening system to process Canadian Sphagnum peat moss with minimal fine peat-moss particles, that is virtually stick free. This innovative equipment and process of screening Sphagnum peat moss, along with a precise blend of coir (horticultural grade), perlite, vermiculite, limestone, wetting agent, low soluble starter nutrient and active ingredients, are used in formulating PRO-MIX germination and young plant production growing media: PRO-MIX FPX and PRO-MIX FPO.
PRO-MIX Growing Media Perfectly Suited for Cuttings
These growing media work very well with cuttings including those in paper-wrapped pots.
They are all available with BIOFUNGICDE, to accelerate seedling development and plant establishment, reduce the need for fungicide drenches and strengthen plant disease resistance. * BIOFUNGICIDE is only available in the US.
Plug trays with PRO-MIX. Source: Premier Tech
In summary, finding the growing medium best suited for the propagation of your cuttings is up to you! By knowing the needs of your crop, you will find the one that meets your criteria.
PRO-MIX BIOFUNGICIDE growing media products are only available in the US. In Canada, the PRO-MIX BIOSTIMULANT is available which can help root hair development on the roots and provide improved plant nutrient absorption. Check for the availability of products with your PRO-MIX sales representative.
For more information, contact your Premier Tech Grower Services Representative.
Jose Chen Lopez
PRO-MIX® is a registered trademark of PREMIER HORTICULTURE Ltd.
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