I sowed some open pollinated Adenium seeds last Nov. They were all planted 1 seed per cell in the same medium, received the same amount of light and watered at the same time. All seeds sprouted with in days of each other. The vast majority of the seedlings grew quickly but a handful did not. Towards the end of January the majority of the seedlings out grew their cells they were moved to plastic cups but the runty seedlings have yet to outgrow the cells. Below is a picture I took today to show the size difference. I am curious to know why this happened. Is it genetics or is there some other reason?