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Based off my understanding of できる in this context, it is used to describe
something as coming to be. Would saying 紅葉ができる be a natural way of saying that
the red leaves of autumn have come to be (i.e. the leaves have turned red)?

The full sentence of this context is as below.

> 紅葉が出来て、カナダは美しくなっています。
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2015-05-30T11:04:49.120
24646
2015-05-30T11:25:59.240
9185
question
words usage
Validity of 紅葉が出来る?
紅葉ができて doesn't sound natural. I think [紅葉]{こうよう}する is what you're looking for.
For example:

> [木々]{きぎ}が[紅葉]{こうよう}して、カナダは今美しいです。

Or you could use 紅葉で (Lit. with / because of the red leaves)

> 紅葉で、今カナダは美しいです。
CC BY-SA 3.0
2015-05-30T11:25:59.240
24647
2015-05-30T11:25:59.240
9831
24646
answer