Yellow nutsedge emergence
I scouted several fields at both nurseries. It seems the nutsedge emerges first in sandy, recently cultivated (cultivated this year), and irrigated fields. Both nurseries had sandy soils; however, fields at both nurseries that were either not irrigated or cultivated did not have any emerged nutsedge (none that I could find).
The image to the right was taken on Friday, April 9, 2004.
Tubers germinate when soil temperatures are sufficiently high. Research in California used degree day models to predict nutsedge emergence. A simpler, and perhaps more reliable indicator is to use landscape plant phenology.
According to a local nurseryman, pie cherries bloom just before yellow nutsedge emergence. Herbicides containing metolachlor (Pennant) provide effective preemergence nutsedge control. These herbicides have to be applied prior to nutsedge emergence. Timing applications with the onset of cherry bloom will help time herbicides correctly. I've also noticed that established landscape Kwansan cherries are in full bloom just a week or so before reports of emergence.
See other nutsedge characteristics
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