Hibiscus, leaves yellowing

I have just planted out a lilac coloured Hibiscus which I have had on the patio in a pot since it was very young. It is approximately 4/5 yrs old. The leaves were looking very yellow (which I believe to be due to over watering) and it hardly ever flowered (just a few and only small). My question is, should I give it something to help it settle in and reduce yellowing, such as Epsom salts? thanks
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"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw