These carefree plants provide bright yellow daisies in spring. Both spread readily by seed; remove spent blooms to prevent spread. Don't allow soil to dry out.
P. aurea. GOLDEN GROUNDSEL. Zones US, MS, LS; USDA 6-9. Native to eastern North America. To 2 ft. high, 6 in. wide. Clump of bright green, toothed leaves is topped in spring by flat clusters of deep yellow, 12- to 1-in.-wide daisies. Good bog garden plant. Formerly known as Senecio aureus.
P. glabella. BUTTERWEED. Zones US, MS, LS, CS, TS; USDA 6-11. Native to the southeastern U.S. Fast-growing, prolifically self-seeding, easy-to-grow plant that makes a bright swath of yellow in wet soils from very early spring to the beginning of summer. Medium green, broadly toothed leaves to 10 in. long form a basal rosette, from which rises a 1- to 3-ft.-tall stem topped by clusters of golden yellow, inch-wide, daisylike flowers. Formerly known as Senecio glabellus.