Need help with flowering plant

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It's been growing slowly for around 4 1/2 months now it's around 4 1/2ft and has gone through hell with mites however all of them are gone which they came with the soil when the plants were transported to a new pot a few months back. It was doing fine after i got rid of the mites, recently in the past 3 weeks I've noticed some of the leaves are getting these spots. I've literally used no chemicals on this plant other than what's in the soil. I'd just like a little help on what I should do to help this issue.