Q.Why are main stems splitting
We have received 11 inches of rain per month for the first 6 months of this year. Will this cause the branches to split?

Downtoearthdigs
Answered on July 6, 2015
I'm not sure of the type of plant your referring too, but yes, to much rain can cause many issues. Fungus, insects, and death of plants and trees.
Here is a link with more information.
https://www.gardeningknowhow.com/plant-problems/environmental/flood-damage-garden.htm
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