All plant leaves turning yellow except Bougainvillea.?

Have small garden containing orange jasmine, gardinia, hibiscus and bouganvillea. Only the bougainvillea is doing well; the other plants, without exception possess yellow leaves and/or green leaves that are yellowing.





I live in central florida, zone 10.





Also possess a Lady of the Night that is doing well and was wondering if it would produce seeds by itself?

All plant leaves turning yellow except Bougainvillea.?
It could be an iron deficiency in the soil.