It could be that they all bloom when they receive a certain signal from another plant of the same species, and that they will set off that signal after storing up for 130 years after the last bloom. So even new plants will receive the signal and bloom, but the trigger takes 130 years to re-arm.
That sounds most plausible. After they bloom and all die, the first generation of new plants to grow will then start the 130 year clock again (by counting days or seasons) and be the first to release the signal again.
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It could be that they all bloom when they receive a certain signal from another plant of the same species, and that they will set off that signal after storing up for 130 years after the last bloom. So even new plants will receive the signal and bloom, but the trigger takes 130 years to re-arm.
That sounds most plausible. After they bloom and all die, the first generation of new plants to grow will then start the 130 year clock again (by counting days or seasons) and be the first to release the signal again.