Early Growth Regulation with Liner Soaks and Drenches

Soil active plant growth regulators (PGRs) can be applied to the rootballs of finished rooted liners or seedling plugs to provide growth control of those plants very early in the production cycle. Typically applied the day before transplant, the PGR rates should be selected to provide “baseline” control of plant growth. Additional PGR applications can be made later in the production cycle if necessary.

This video details experiments on the use of Piccolo 10 XC (paclobutrazol, Fine Americas, Inc., Walnut Creek, CA) as a liner soak on a variety of herbaceous perennial liners as well as the use of Concise (uniconazole, Fine Americas, Inc.) as a liner soak or liner drench. Recommendations are detailed for determining appropriate liner drench rates based on effective liner soak rates.

For more information on using pre-plant liner soaks on annual crops, check out Dr. Brian Whipker’s video at [ Ссылка ].


Joyce Latimer is an Extension Specialist for Greenhouse Crops at Virginia Tech in Blacksburg, Virginia. Joyce has been evaluating plant growth regulators (PGRs) on herbaceous perennials for over 25 years. Her passion is improving plant quality and ease of production for producers while improving the quality of these plants for the home garden.

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