If I was you i'd hit up a hardware store and grab some blood meal. High N, you can top dress and water them, just throw a tablespoon on that pot (spread it out) and give it a decent water. Do that every other time you water. Look up what else can give you NPK and you can find it at the hardware store/wally.
The signs of trouble.... no signs, its an outdoor plant so your gonna find strange things sometimes, don't stress.
Looks like you literally topped the whole plant, lol just leave it as it is because those leaves are still providing energy for the thing. It'll be alright.