Just received a banana parcel the other day. Was "guaranteed" to arrive last Friday, and was at the delivering post office Thursday, but somehow the nanners didn't arrive until Tuesday after spending 8 days in a box. They were still in decent shape but there were some rotten roots and a few other spots of rot. Postal workers seem to be universally crap so here's a little step by step of how I treated my nanners to hopefully ensure the main stems would continue to grow.
How they were packaged. A great job. Roots wrapped in damp PT and then wrapped in plastic bags/tape.
Unpackaged
Cleaned up. Rotten roots were snipped, soft rotting leaf sheets were removed, and dead leaf removed from top. Notice the rot on the corm of the RP on the left, it was scraped out with a small spoon, leaving only firm tissue.
Treated with a Copper fungicide to help resist mold. Notice spot of rot on the pstem of RP on the left. Copper helps dry it out and will prevent rot from growing into the cigar leaf b4 it can begin pushing out again in a few weeks.
Planted in very well draining soil, with pstem rot above soil level.
