Any idea what could be causing this?
Hi there,Hello and welcome to GF
You don't say what type of plant it is and what you've been doing with it.
Thank you very much Mr. Norris. Very-much appreciatedIt isn't frost damage. It is a leaf spot fungus. There are many variations of leaf spot but it appears yours is one of the most common, where you have a light brown spot surrounded by a dark halo.
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