No dead-heading is necessary for continuous bloom.
Snow Princess is cold tolerant and heat-tolerant. She is very vigorous so pair her with other vigorous plants.
White Knight is a "heavy drinker" and will prefer evenly moist soil. It will be quick to show drought stress but should bounce back quickly once re-hydrated. In a hanging basket, you should be prepared to water often, maybe more than once a day during warm weather. Plants are easier to keep moist when planted in large planters. To help maximize performance use applications of a well-balanced water-soluble fertilizer (according to package directions) starting in mid-summer.
Photos courtesy of Proven Winners