Answer: Mandevillas are heat and sun loving plants. They need full sun all day long, especially in a northern area with short summers like yours. At a bare minimum they need six hours a day of full direct sun including the hour of noon. In too much shade they will not bloom for you. Also, since you will have to bring them inside each fall I would suggest you grow them as container plants. This makes moving them in and out much easier. Enjoy your mandevillas!
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