次々 and 一斉: successive blooming and simultaneous starts
Compare garden flowers blooming successively or all at once, with presenters appearing in succession and athletes starting together.
Successive flowers and presenters
春になると庭の花が次々に咲きます。 says that garden flowers bloom one after another in spring. 次々, read つぎつぎ, describes the successive flow without fixing an exact interval.
発表者が次々と舞台に上がりました。 reports presenters coming onto the stage in succession. 次々と concerns their sequential appearance rather than a performance ranking or stated participant count.
A shared start and simultaneous blooming
合図とともに選手たちが一斉に走り出した。 reports the athletes all starting at the signal. 一斉, read いっせい, concerns their shared starting time, not a shared finishing time.
春になると庭の花が一斉に咲く。 says that the garden flowers bloom all at once in spring. Its garden-flower context can be compared directly with 次々に咲きます to distinguish succession from simultaneous blooming.
Timing in the same flower context
次々 presents one event following another, while 一斉 presents multiple participants acting together. Locate the flowers, presenters, or athletes without treating an ordered appearance as a performance placing.
Both flower examples concern spring blooming, but their timing differs. Do not replace that distinction with temporary versus permanent states or invent a numerical blooming interval.
How do garden flowers blooming 次々に and 一斉に differ?
Show the answer and why
次々に gives successive blooming; 一斉に gives blooming together. Exact intervals, flower counts, and the athletes' finishing times are not supplied.