Question: Which window should I use?
Answer: Whichever window works. Since every window is unique, there’s no simple answer. It’s not the window, but the environment in the window area. What you want is plenty of bright light, but not direct, hot, sun. Which window provides this depends upon the season, climate, type and cleanliness of glass, obstructions outside the window, and more. If there is too little light, your violets may have healthy, green foliage, but few flowers. Leaves might also grow upward, rather than flat, and be longer than normal. A violet receiving too much light, might exhibit tight, crowded growth, that will grow flat or hug the pot rim. Leaves might be yellow or bleached if sunlight is too strong or warm. Start with a window that you believe provides optimal conditions, and if your violet isn’t happy, move it to a better spot. Also remember that the best window may change depending upon time of year and weather conditions.