Vol. 43

Title:
Plug Production for Seedlings

Author:
Andrew Eames

pp: 144-145

Abstract:
The term plug describes modules ranging from 1.5 ml by volume up to 4 cm square—or larger. These are clearly extremes and most seedlings are produced in plugs ranging from about 2 to 10 ml in compost volume. In nursery stock terms it is quite appropriate to think of plugs as mini-liners; the description fits them quite well.

The first experiments with plugs, or modules, occurred in the 1950s. It is debatable whether the idea was actually invented—they probably gradually developed from a scaling-down of larger techniques.

It is certain that American growers must be credited with the first commercial use of what we would now recognise as plugs. They were certainly in use by 1960, and after a relatively slow start their use accelerated; by the early 1970s they were in widespread use throughout the U.S.A. and they were beginning to be used in the U.K. Since that time they have become a very important tool in the production of pot and bedding plants.

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