Many people here like to grow Hydrangea or Hortensia, especially the old people. You can pretty much buy the plants even in early stage of blooming or full bloom. Hortensia reminds me of Dok Said Tee for some reason and I wonder if I can grow them in Laos. I think my aunts would love to see the bright color of the flowers. I have seen them in white, pink, purple, and even blue. My favorite is the blue type.
Usually, the color of the flower depends on the pH of the soil. If you have acidic soils, then you get blue flowers. If the soils are neutral, then you get very pale cream petals. If you have alkaline soils then you get pink or purple.