Homes Businesses Industrial Water Conservation Energy Independence Act Power Hour Pay-It-Forward Home Energy Audits Home / Rebates / Water Conservation / Xeriscape / Xeriscape Plants / Xeriscape Plants Plants listed here are found in the Riverfront Park Demonstration Garden along the Apple Capital Loop Trail in Wenatchee. Numbers refer to plant identification markers in the garden. Click on photos to enlarge and for more plant details. Back Missouri evening primrose (Oenothera macrocarpa) Plant type Herbaceous perennial Flower color Yellow Flower season Summer Plant size 12" H X 18" W Hardiness -25 degrees Light preference Full sun Winterizing instructions Additional comments Huge 4" flowers that open each afternoon and close the following morning Tag number in xeriscape garden 11