edwmax

OK, the pot is larger than It looks in the photo. But I got the plant size right. So I think you could be over fertilizing the plant and damaging the roots. Most potting soil mixes already have fertilizer for about 4 to 6 months.

At this point the plant clearly looks to be in trouble. I don't think you have little to lose but to re pot in fresh soil. This will also give you the opportunity to inspect the roots for any other problem that might exist. And, while the plant is out, inspect the underside of the leaves for insect and treat if needed. I would also spray the plant with a bleach/water mix and then wash off with a light spray from a garden hose to kill any fungus infection that might exist. May be your girlfriend will have a better suggestion for treatment.

Also, inspect the existing soil and pot. See if the pot stopped draining trapping water in the bottom turning bad. This could be the problem!!! .... The pot needs to drain excess water out and you need to see this to know when enough water has been given. Water when the top 1/2 inch becomes dry. If the soil is draining you can not over water.

After re-potting do not give any fertilizer until you see improvement and new growth. The potting soil will already have fertilizer, so may be a little liquid nitrogen fertilizer for a boost. Nitrogen grows the leaves & plant; potassium (aka: banana food) grows the roots and fruit. A young plants needs to grow leaves to be able to grow roots. It needs more nitrogen than potassium at this point. IMO, banana food is not a good choice for young plants.

Good luck, I hope you can find the problem and re-potting will improve the plant.

__________________