September 21 is considered to be the beginning of spring in the Southern hemisphere. The dry season ends and the first rains mark the end of September. The beginning of spring seems logical enough to start planting trees, isn't it? However, due to the geographical situation of Brazil the raining season doesn't begin in some states at the end of September.
In Northern states September is the peak of the dry season. Planting trees at the end of September doesn't bring the desired result, that's why the observance is moved to March. One day only is not enough to hold various events and activities dedicated to Arbor Day, that is why many states observe Arbor Week.Remind me with Google Calendar
- Ecological Observances
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