Impatiens in Full Sun
I have learned that when it comes to gardening there are very few absolutes. You can almost always find exceptions to any rule. I have found one recently that I would like to share with you. In Houston, with our warm temperatures and long growing season, impatiens are recommended as a shade plant. Bright light but no direct afternoon sun. I would say that is very good information when planting them from May to September. I do it a little differently lately.
In early Spring I will plant impatiens in the full sun. When we have cool nights and mild daily temperatures impatiens will never be more beautiful than in full sun! Their blooming potential with more light is greater than in shade. I expect to only get about three good months out of them when I do this. It will get too hot in June for them and they will crater but you will experience awesome color until then. The same holds true when you plant them in October. I planted mine the first week of October and they are ablaze in color right now. I took a picture of these impatiens in full sun. Please note that we just had three days of heavy rain and they aren't what they were when I wrote the prior paragraphs but they will be glorious again in a few days
Try this planting technique once and I doubt you would ever plant impatiens in shade again.