Focus on Weed Control – Pennsylvania Smartweed

A weed that I have gotten many questions and emailed pictures about this spring is Pennsylvania Smartweed.  This is an annual weed common to central Ohio that is in the same family as Buckwheat.  It can produce upwards of 20,000 seeds per plant that can persist in the soil for several years so control of this weed before seed set is critical for the backyard grower, community gardener and urban farmer.

One use of note for this weed is as a trap crop.  Japanese Beetles prefer this as a forage to the rest of my desired plantings and will feed on this first before going to my vegetables, fruits and herbs.  To make effective use of this weed as a trap crop, make sure to kill the beetles regularly or you have provided them with food and shelter instead.

The flower of Pennsylvania Smartweed including a couple of breeding pollinators.  Make sure to mow, herbicide, or use tillage to kill this weed before seed set to prevent large amounts of weed seed from entering your seed bank.

Source fact sheet for background information – Credit: Michigan State University Extension. 

 

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