1: Flowering period
Flowering period refers to the phase when plants produce their flowers. Flowering period can vary from species to species. Some plants show flowering more than once in a year and others show flowering only once in their lifetime.
2: Seasonal plants
Seasonal plants are those which show flowering in a particular season every year due to favorable environmental conditions like temperature, humidity, and light etc.
The availability of fruits like mango, apple, jackfruit, etc. is seasonal because these all show flowering in a particular season. This is further linked to the specific photoperiod that they require for flowering.