I have a Dipladenia plant, which leaves keeping turning yellow. I pit dishwashing soap to clean up soil, and hopefully to quit losing yell0w, falling off leaves? I keep in bright light in my three seasons room during the winter.
Thanks in advance for any help you may find.
Yellowing leaves could be watering issues; too much or too little, or temperature issues.
Water the plant when the top inch or so dries.
Make sure the soil is well draining.