Your hanging basket is probably packed full of plants, all competing for water and nutrients.
It is most important to water at least once a day. During extreme heat, you might want to check it twice a day. The basket will feel light when dry, and heavy when totally hydrated.
Add Miracle-Gro to the water every 2 weeks or a time release granular fertilizer like Osmocote every 4 months.
Remove dead flowers to encourage new blooms. If the plant gets too leggy and a little thin on top, you will need to prune. Don’t be afraid to cut back as this will stimulate more growth and new flowers.
With a little care, your hanging basket will add that needed blast of color all summer long.