Definition of fillerCategorized under "General"
Definition as written by talinum:
Nondescript plants used in a garden area to back up, surround, or fill in around a specimen plant. Filler plants should be green for most of the season.
Definition as written by Terry:
Filler plants can also be used to temporarily fill in a space that eventually will be occupied by a maturing tree, shrub, or large perennial
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