Rudbeckia hirta 'Prairie Sun' needs full sun to flower most prolifically. Set plants a foot apart in moist, well drained soil. Adding organic matter to the soil before planting will improve the plant's performance.
This variety may be a short-lived perennial in zones 3-8 but most gardeners who grow it feel that it performs best as an annual. Plants will often return by self-sowing.
It will bloom in the fall from seed planted in the spring. Buying nursery transplants is a way to get earlier blooms.
'Prairie Sun' can fall victim to powdery mildew if it is crowded so watch the spacing and provide good air circulation.