At the end of the Justice League (2017) movie, the growing plants look very unusual.
I know Cyborg and Superman have stopped the Mother Boxes forming Unity but still the plants look different. Why so?
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I will base my answer only on the Justice League-2017 movie plot and what the DCEU explains about the Mother-boxes. According to the DCEU,
A Mother Box, also called a Change Engine, is a perpetual energy matrix of Apokoliptian origin.
It's powers (although not much explored in the JL-2017 movie), include:
According to here,
Biological Manipulation: Mother Boxes are able to manipulate life on a cellular level, including augmentations of biological functions, by utilizing a unique energy field.
In the movie, the Mother boxes were briefly reunited by Steppenwolf before being separated by Superman and Cyborg. So during that brief moment, there could have been some unknown effects created by the Mother boxes leading to the plant life changing appearance (as they could have been modified at a molecular level).
Another evidence is what Batman says when the team is discussing on the way to bring back Superman. Batman says to the Flash :
The Mother Box was designed to reshape a planet.
In conclusion, it is highly possible that the merging of the three Mother-boxes could have led to some changes in the life-forms around them within a specific range.