Allamanda demands support or it will grow as a huge mound. Best time to prune allamanda is in November.1
Try to plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Cherries jubilee is thought of as tender, so remember to wait until your soil is warm and the night time temperature is well above freezing before moving outside.1 botanical-journeys-plant-guides.com/allamanda-plant.html