New flowers will develop on older flower stalks so do not remove them. Grow where humidity is and sun bright in well drained soil.1
Try to plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Rubra is thought of as tender, so it is imperative to wait until temperatures are mild before planting out of doors. Ensure your soil has a ph of between 5.0 and 6.5 as Rubra is a moderately acidic soil - weakly acidic soil loving plant.hoya
1 mygardenguide.com/plant_detail.html?id=501775