TechNotes Tips - 02.22.02 - Lawn & Landscape

Published March 13, 2002

Crabgrass germination and developmental keys: Ornamental plant development events and soil temperatures can be used to predict when crabgrass will germinate. For example, forsythia flower withering is a sign for crabgrass germination. Below are some key soil temperatures for crabgrass appearance (Fidanza et al. 1996. Crop Science).

Description of crabgrass development	Temperature (F)
Average minimum soil temperature at which initial appearance is observed	54
Average mean soil temperature at which initial appearance is observed	60 to 64
Average minimum soil temperature at which major emergence occurs	68 to 70
Average mean soil temperature at which major emergence occurs	73 to 75

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