Outdoor learning

I've read about artists, especially botanical artists, that take years to finish a work of art, not because they were just super slow, but because they had to wait.  What did they have to wait for?  Nature. These artists would focus on a particular plant while it was in bloom or its fruit was ripe, or it was at some other particular stage in its yearly cycle that they wanted to portray.  Then, when the blooms faded, the fruit was gone, or the plant had moved on to another stage, that painting and its associated sketches were put away until the [...]