Yellow bush daisies are not terribly drought tolerant. Keep the soil slightly damp and do not allow it to dry completely between waterings. Water lightly at the first sign of wilting leaves. Do not soak the roots or allow water to stand around the plants for more than a few hours at a time.
These daisies are not salt tolerant. Read labels carefully, especially fertilizer labels and do not use products that rely on salt or salt derivatives. A small amount of natural composted manure each spring is sufficient to fertilize these plants for an entire season.
Yellow daisies like full sun. In USDA zones 9 through 11, they grow to a height of 2 to 4 feet and produce yellow flowers year-round. In zone 8, they may be somewhat smaller and stop producing flowers for the colder winter months. In extremely hot climates, the African daisy prefers morning sun and partial shade in the afternoon. Plant these daisies at any time of the year. They are known for attracting butterflies.
Yellow daisies are not susceptible to many pests, except for nematodes. Nematodes are microscopic soil organisms that attack daisy roots. If your daisies are not growing to their full size or do not seem to be setting on many blooms, the problems could be nematodes. Check the plant's roots. Look for odd-shaped nodules growing on the roots. Such nodules could indicate the presence of nematodes.