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It also seems that the anthocyans responsible for the color may also have a role in protection against low temperatures in some plants. They are only produced toward late summer and are formed depending on the breakdown of sugars in the presence of light (which also leads to the trees fall red leaves, although there are other pigments involved as well). So, all in all, there is nothing to be worried about.
H. americana is a bit more fussy than H. acutiloba when it comes to garden cultivation.
What do you think it requires more than H.acutiloba?A wonderful picture with autumn leaves around green Hepaticas!