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Liners being grown in a greenhouse.

"Liners" is a horticultural term referring to trays of very young plants, usually grown for sale to retailers or wholesalers, who then grow them to a larger size before selling them to consumers. Liners are usually grown from seed, but may also be grown from cuttings or tissue culture. They are grown in plastic trays with many "cells," each of which contains a single liner plant. Liners will typically range in size from a 36 cell tray up to a 288 cell tray. The most common size used in commercial nurseries is between 50 and 72 cells. The term "liner", is typically used for perennial, ornamental, and woody seedlings. Annuals in this form are usually referred to as plugs.^[1]

According to the U.S. Department of Agriculture, plants can only be defined as "liners" if they are at least an inch in diameter but not more than 3 inches in diameter at the widest point. Plant liners must also have established root systems that touch the outer edges of the container and stay intact when lifted from the container.^[2]

References

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