How long does it take for marigold/rice/wheat/coconut/mango plants to come to flower? In some plants, where flowering occurs more than once, what you call the winter- flowering period juvenile or mature.

Hint: Flowering is the blooming of the aesthetic part which holds reproductive organs of the plants. The flower is condensed modified shoot. Flowering occurs when plants attain maturity when reproductive organs become mature and pollinated and the shed out from the plants.

Complete answer:
Those plants which show flowering one time and the fall out called annual plants, such as marigold, wheat and rice plants are annual plants and they take 3 months for the flowering and they live for one year.
Mango, coconut are trees which is a perennial plant and they take a long time for the flowering, in case of mango, it takes 3 to 6 year for the flowering which depends on environment condition too. While coconut tree take a longer time for flowering it's about 7 years
Mature phase occurs when sexual organ fully developed and this phase-out after the first flowering
When plants show flowering more than once show the juvenile phase of inter flowering period which is the period between two consecutive phases between flowering. After the first flowering, the second time flowering also shows maturation phase.
Some plants show flowering once in a lifetime and some plants take a decade for flowering like a bamboo plant, which takes 11 years for the flowering.

Note: Apart from flowering plants are distributed as the short-day plant they require less sunlight and they are grown in the winter season. Some plants are long-day plants, they require more sunlight and they are grown in the summer season, such plants are categorized into the photoperiodism of the plants.