On Apr 6, 6:08*pm, researcher wrote:
My sweet peas grew very well and flowered well but some started dying
out too soon. *I have grown sweet peas for years but this is the first
time this is occurring. *I am located along the coast in So. CA.

I'm running into the same problems in the same general area (SoCal
coast). I tried growing them last summer and they died but that was
because I had to go out of town for a few days and didn't water them.
I planted my current batch in early March when temperatures were in
the 60's and they grew very well and bloomed but are now almost
completely dead (despite keeping them well watered).

Hopefully someone can shed light on this.