A new and distinct cultivar of Calibrachoa plant named `USCALI518-1`, characterized by its outwardly to low spreading growth habit; compact plant habit; semi-double red purple-colored flowers with darker red purple-colored centers; good garden performance; and resistance to Thielaviopsis.

 
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< Calibrachoa plant named `USCALI223-1`

> Verbena plant named `USBENA6201`

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