Likes plenty of water but also likes good drainage; does not want to stand in water. Water at ground level rather than misting the entire plant often to help avoid mildew. Also, fertilize or compost well early in the year (not right at flowering time, as this can cause them to finish flowering too quickly.)
Prune to shape or to remove dead wood.
Mrs. N. Thompson likes a position of full sun and remember to water often. Keep in mind when planting that Mrs. N. Thompson is thought of as hardy, so this plant will survive close to or on freezing temperatures.