Mandevilla How Much Sun. Plant one plant per 12 to 14 inch container to work best. Dipladenia and Mandevilla will flower best in full sunsix to eight hours a daybut will tolerate part shade.
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If you are a resident of cold areas you can shift them inside during the fall.
Theyll tolerate a spot with morning shade and afternoon sun but they may not bloom as profusely. Ensure the soil is moist and avoid overwatering the plant. Plant one plant per 12 to 14 inch container to work best. 07062021 Gardeners should note that if they dont give the Mandevilla the sun it needs then they can expect the plant to flower poorly during the growing season.