I have yellow leaves on my gardenia. Does this mean it has a disease or deficient in something? I also have a camellia, which has many flowers, though prior to opening they have brown marks on them and when open only last for a very short period of time.
Gardenia and Camellia
Certified GKH Gardening Expert
Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/helping-a-gardenia-bush-with-yellow-leaves.htm