How can this happen? Don't be fooled!
Have you ever wondered why it can rain for days on end and why none of your flowering plants, in particular the flowers themselves turn brown or discolor?
That's right. I have gardenia, jasmine, and brunfelsia that will put out the nicest white flowers and stay WHITE for days on end in rain water for days!
I have flowers all over my gardenia that have stayed a nice white in days of this rain. I can not get them to do that with tap water once it sprays all over my plants..lol
Try watering them with tap water and see what happens to your beautiful white flowers in just one day if you have tap water like mine.
Don't be fooled by discoloration or yellowing leaves on your plants. It may just be the tap waters fault.