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Black-eyed susan is a relatively large wildflower, ranging from 30-90 cm. in height. As indicated by its name, the flower head has a prominent black or dark-brown central cone that is surrounded by rich, yellow, petal-like rays. The leaves are long, lanceolate, and rough to the touch. The stalk is robust and also coarsely textured.
Each black-eyed susan has a singular flowerhead positioned atop the terminal shoot. The flowerheads are quite large, measuring 5-7.5 cm. in width, and are radially symmetrical. The bloom has a prominent black or dark-brown hairy central cone that is surrounded by rich-yellow, long, ray-like, prominently linearly-veined, bristle-tipped petal-like rays. rays grow form the underportion of the central cone and droop slightly downward. The upper stems are long and devoid of leaves, each producing a single composite flower. This flower consists of many dark brown disk florets, forming a flattened cone, surrounded by 8-20 ray florets that are bright yellow (rarely with patches of maroon near the base). The style-tips of the disk florets are slender and pointed. Each composite flower is about 2-3" across, and has no noticeable scent. Black-Eyed Susan blooms primarily from early to mid-summer for about a month, although some plants will bloom during the late summer or fall. The achenes are black, oblong, finely nerved, and without tufts of hair. The root system consists of a central taproot and is without rhizomes – this plant reproduces entirely by seed.
With their brown button centers and bright yellow petals, Rudbeckia hirta flowers (commonly called black-eyed Susans) are cheery additions to informal gardens, landscaping islands, mailbox gardens, and borders. To me, they're a cottage garden staple and an absolute must-have for gardeners in Maryland, where black-eyed Susan is the state flower. Answer: You probably have more than one issue if all of these plants are having problems, especially the shasta daisies, which usually don't have severe fungal problems. I'm wondering if it isn't pest damage. Check out this extension webpage regarding the fourlined bug https://extension.umn.edu/yard-and-garden-insects/... They produce black spots on shastas. If you have fungal issues, too, you could try removing the black-eyed Susans and thinning the other plants so that there is lots of space around them. This would reduce the moisture that encourages fungal disease. Also, if you have a heavy application of mulch, scrape it back so there's only two inches at most. Pruning your roses, especially their centers, will help reduce trapped moisture also. (Source: dengarden.com)