why does the kurinji flower(strobilanthes kunthianus)bloom only once in 12 years?

Answer 1

Plants that flower this way are referred to as mass flowering or gregarious flowering. These plants take several years to gather resources to flower in synchrony over a large area then they die once they have set seed.
The purpose of mass flowering with blue flower coloration is linked to pollination by bees. The flower is broadly tubular with a prominent female stigma for the bee to deposit pollen on while reaching for the recessed male, pollen bearing anthers and nectar. Blue is visible to bees that see farther into the ultraviolet than we do.
The reason for long intervals between flowering events is possibly due to several factors. If conditions are not favorable the plant will bloom & die but set very little seed. The plant will set more seed if it can attract mainly bees rather than ants, butterflies, or flies that rarely contact the stigma so do not fertilize the flower before taking the nectar. The bees will forsake other plants if the Strobilanthes can offer large numbers of very nectar rich flowers. The plants may be keyed to bloom by the same factors that allow the bee population to rise.
While the plant is in bloom it attracts herbivores that will eat the seeds. If to many are eaten before seeds drop and the plant dies it will die out. Mass flowering will attract herbivores but there will be so many flowers that any one plant will still have a good chance of setting seeds. This is called predator satiation. The long interval prevents the predator population from surviving in between bloom years at a very high density. So the plants may be keyed to their population either as well or instead of the pollinators.

Important Rain Forest canopy trees in the family Dipterocarpaceae, reproduce in gregarious mast-fruiting events once every 2–11 years.

Certain clumping bamboos also reproduce in this episodic manner. Once they flower they die. This can be hard on a gardener who has used bamboo as an element in their garden design. Historic mass flower and death in bamboo occurred in 919 & 1114 in China. In Japan it was 1716 & 1845 when the plants died. Since then the Fargesia bamboos have bee growing in Europe and America. In 1960's stocks all over the world flowered and died. These plants have a about 120 year seed cycle.
Certain trees fruit this way, both Oak and Ash trees do. In fact the phenomena is called mast fruiting because nuts on the forest floor are called mast. This dates back to when swine ran free eating the mast in fall to be fattened before slaughter.
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Answer 2

Hi
There are many questions yet to answer.
This is another one.
That is Nature's play.
Some flowers bloom in the night, some once in a year, some allways... its the character of the plant.
"Strobilanthes kunthiana" : Man’s excessive curiosity can defeat the evolutionary objective of massive flowering. However, gregarious flowering definitely can accommodate some interference from men.

Answer 3

it is curse of one god, when the god wife taken by another person, the god is searching his wife in the forest, at the time
the kurinji is boom every were. the god is anger with the flower and curse the flower not to bloom until he trace his wife.
the god only find his wife after 12 years and kurungi bloom
at once.
from that day kurunji take 12 years to bloom.
it is old story

Answer 4

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