It would probably work fine on older plants. The thing you should compare, is how much fertilizer they have (it should be written on the bag) and the pH (should also be written). These two can be more problematic for small plants. Also how it dries out. If it seems to dry out only at the surface while at the bottom it's soggy, the mix is just no good. A good product should kinda dry out more evenly (in small stuff like transplant cups at least).
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