Dwarf plant turning yellow

This plant hasn’t grown in weeks. Now leaves are beginning to turn yellow. I’m guessing it has to be a lack of nutrients. I used the Happy Frog soil from Fox Farm. The other plant is 4 times the size of this one and the leaves are green. PH meter says all is well. Is it a lack of Calcium, Nitrogen or something else? This is an outdoor plant.

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No expert here, but maybe it’s rootbound and needs a bigger pot?

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The leaves also look as though it has revegged… might take it some time to go back to regular growth… alot of cloudy days maybe?? Not so much the yellowing but the leave shape is what I’m looking at.

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First, your soil isn’t designed to carry through without adding nutes. The leaves yellowing off, starting with lower leaves is the clue. The soil is played out. You may be able to salvage with added nutes like the liquid trio from fox, and a bigger pot, or it may be too late.