I bought a green shiso plant about 2 weeks ago, and it's not very happy. We've had a lot of days with highs in the mid 80s here, and that may be the cause. I also saw some small holes chewed into the leaves but checked for caterpillars and other bugs and saw nothing. I sprayed soapy water on and put diatomaceous earth all around the plant, but it seems not to be responding. I am watering it every other day. It's on an east-facing balcony, so it gets sun most of the day.
I need some tips as to what I can do to jump start this plant and give it a chance so it doesn't die. I'd like to do it without pesticides or chemicals. The leaves are not brown yet, but some are turning brown and the rest are very droopy.