Dear All, It is true that Oxalis flowers will only open in direct light, best is direct sunshine of course. But.... there is a trick to have open flowers any time of the day. Keep the flowering plant very dark, like in a hermetically closed (to light) box or a cupboard and then bring it into a well lit room at the time you want open flowers. it may need some extra light to open the flowers fully. This also works with other flowers that need direct light. The effect will last for some hours. Commercial plant dealers do that at plant sales. greetings from dull November-weather in Germany, all flowers closed..... Uli