Answer: Based on your description this might be a Mandevilla splendens or Allamanda. This tropical plant must come indoors in the fall before temperatures fall below 45 degrees or it will be damaged by the cold. It likes full sun all summer outdoors, and a very bright window sill in the winter. Keep the soil evenly moist (not sopping wet, just damp) in the summer and fertilize regularly with a water soluble fertilizer such as 10-10-10 plus minors during the growing season. In winter while it is indoors cut back a bit on the water and stop feeding it while it rests. If it needs to be pruned to control its size, cut it back in late winter. Enjoy!
Q&A Library Searching Tips