Trial of Acid and Fire + cherry Blossom spell

[Ezzard]

So two things I need to confirm. Does the spell (Trail of Acid and Fire) trigger the Cherry Blossom effect each round or is it only triggered once per spell cast?

To give an example of what I mean here is a link to how toppling spell works with MM.
https://paizo.com/threads/rzs42lo6?Toppling-spell-Magic-Missile-how-many-ch ecks

Next, if it does trigger CB each round how many times does it trigger? Some in my circle think it triggers twice. Once for the Fire damage and again for the acid. I presented a counter to that with the following:

It's "1d6 points of acid damage *and* 1d6 points of fire damage."

Not "1d6 points of acid damage *then* 1d6 points of fire damage."

My point being that you take 2d6 once each round. Half of it's Acid the other half Fire. But I've been wrong before so here I am.

[willuwontu]

It triggers each time the spell deals damage.

There is only one instance of damage when it deals damage. The fire and acid are part of the same damage.