Need help... badly.

Ok, so here is the deal. I have 3 plants outdoor and I recently had a whitefly problem. I used soap-based insecticide and now my plants look... pretty bad.

I have not used any fertilizer so far, so they might lack something but I just don't know exactly what. Could the soap-based stuff and the insect done all this dammage or is there something missing?

To me, it seems like there are 2 different problem. The spots on the leaves and the curling/blackening of tips.

looks like potassium def. and either phytotoxicity from the insecticide or calcium def.

Think the blackening will go over time since I recently killed the bugs?

no I think the blackening is because of the deficiency. get yourself some flowering nutes.

Ok I'll try that.
I just watered them 2 days ago with plain water and it keeps raining outside... So I can't fix them up now, it pisses me off... All went down so fast... I'll keep you posted, thanks.