It seems mine just finished blooming. I have just put up on Daves Garden Market Place and eBay the ones I have ready to sell as starters. Three of them are Zygo and the other is a S. Russeliana. Peaches and Cream, Yellow, Orange and Pink are the four colors I have ready now. The greenhouse is full and I have not even taking cuttings on my other colors because they are young plants and I want them to bloom one time before I begin propagating them.
I have some beautiful plants coming along of all colors.
I give mine Miracle Grow if I think about it and they get fed with the others. Other than that, they are on their own. But, I let mine get dry to the touch between waterings which is what I was told to do. Maybe I was told wrong but it has been working. They can get too much water and rot.
Here is a picture of the peaches and cream jut ready to open.