It's certainly is worth having insurance over growing Cephs. I lost over 10 large plants last summer which keeled over one by one!
And even this week another one that had been growing with them at the time also has collapsed. All plants shrivelled up and went yellow/black. And despite keeping the original ones, so far none have regrown!
And yet I had been growing this particular clone for 21 years without a single loss. Thankfully I have other Cephs both this clone & others eleswhere, but it certainly makes you nervous. Particulary as I have never pinned down where this infection came from, as the water supply has never been changed. Guess my time was up!
cheers
bill