problem with carica papaya seedling survival
I live in a temperate zone, have a large conservatory, its mid summer now. My papaya seedlings (ex shop fruit)get to 1cm 1/4" high then die. I have tried various soil and sterile soil-less mixes, lately a very sandy/gritty/bio char well draining mix. Tried the range of full sun to full shade, they are warm 20 - 40 C, its humid. Tried bleaching the seeds, natural fungicides to prevent damping-off, keeping some of them dryish and keeping others moist and in-between, Tried adding onion mold to compete with other negative pathogens.
Its been 2 years of experimenting now, just can't get it, which is a shame , cause I love papaya. Kiwi fruit seedlings seem to be going the same way, and they are a good 6" high.
Any ideas welcomed?