Plug (horticulture)

Plugs in horticulture are small-sized seedlings grown in seed trays filled with potting soil.

[5] Within days of planting signs of growth are typically visible: leaves will perk up and roots anchor into the soil.

Air pruned plugs are grown in a manner to promote very rapid growth almost immediately after being transplanted to new soil.

It is of note that many varieties actively benefit from being transplanted as severing the taproot encourages bushier root growth.

The thinning action is highly beneficial in itself as it provides soil aeration at depth without disturbing adjacent roots systems.

The initial concentration of seedlings also dilutes damage from pests and provided some food for the gardener or the compost in the form of thinnings.