UC Master Gardeners of Napa County are encouraging local gardeners to try new plant propagation methods, including the use of hydroponic cloners. According to Penny Pawl, a UC Master Gardener, fellow gardener Gayle Nelson has found success using a cloner to root gardenia cuttings in just four weeks.
A cloner is described as a machine that uses water and a small pump to wash plant stems and encourage root growth. The device holds cuttings in soft rubber plugs above a tank of water, with continuous circulation helping roots develop quickly. Pawl noted, “I have had my cloners so long and use them so often that I have had to replace two of the pumps.”
Pawl shared her experience with various propagation techniques. She has used both hydroponic cloners and traditional mixtures of sharp sand and pumice for plants less suited to the machine. She explained that coarse media like sharp sand help roots branch out more effectively.
She also described air layering as another method, particularly effective for trees such as maples. The process involves cutting into the bark, wrapping the area with damp sphagnum moss, and waiting for roots to form before separating the new sapling from the parent tree.
Despite these successes, Pawl admitted challenges with grafting: “I have never made a successful graft. What am I doing wrong? I have rather given up on it.”
Once cuttings develop roots—whether through cloning or other methods—they are potted in soil-less mixes containing lava rock, compost, bark, pumice, and perlite. New plants receive homemade worm compost as fertilizer and are kept protected until established.
The article also announces upcoming educational events hosted by UC Master Gardeners of Napa County:
– A virtual workshop on “Winter Rose Care” will be held on Saturday, January 10 from 10 am to noon via Zoom. Participants can learn pruning techniques for all rose types.
– An in-person workshop titled “Starting Your Own Vegetable Seedlings” will take place on Saturday, January 10 from 2 pm to 4 pm at UC Cooperative Extension at 1710 Soscol Avenue in Napa. Attendees will learn about seed starting basics and care for seedlings until transplanting; some materials will be provided.
The UC Master Gardener Help Desk remains available online or in person at their office for those seeking advice about gardening problems.
