Mandevilla Flowers Falling Off. Yes you can bring it in and put it in a sunny room but it has to be direct sun in order to keep flowering. 30092002 I recently brought in a mandevilla into my greenhouse.
Plus the flowers sometimes have yellow throats. Apart from insect pests Mandevilla tend to stay healthy if not compromised by wet feet or lack of sun. 02072021 Mandevilla Mandevilla also known as rocktrumpet is a genus of flowering vines that grow in tropical and subtropical climates.
Most types will begun to sulk -- and possibly cast.
Mandevilla likes somewhat moist but not wet soil. It could also be that you have thrips. Plus the flowers sometimes have yellow throats. You should bring the plants indoors if this happens.