Your article is contradicting. This is what you have on your article. ("Fertilize monthly between April and November. Do not fertilize gardenias in the fall.") Fall starts in September. So can I still fertilize my gardenias in October and November?
Certified GKH Gardening Expert
Only fertilize into Oct and November if the plant is still actively growing. Avoid fertilizing when the plant is entering dormancy or is dormant.