John, your potting mix sounds very good. My mix is nearly the same and is also airy and drains well.
During the latter part of our summers is when we get more rain...sometimes 3 days in a row. My very young seedlings love the rains and have virtually no issues with rot. It is my older seedlings (1 to 2 years) as well as some of my mature ones that are extremely susceptible to apex rot. Constant moisture sitting on the stem tips causes rotting.
Last year we had a heck of a lot of rain and many of my adeniums suffered stem rot, so I told myself that this year I will erect a canopy to keep the rain off my plants. Well...umm...haven't done it yet.
The El Nino continues to cause some strange fluctuations in our climate so I'm
that we won't get the unusually excessive rains like we did last year. We'll see.
