Most of the marketing hype on these hybrids mention "vigorous" and "easy to grow." No mention of "easy to die."
Oh yes, if I remember correctly, most of the patent applications for these hybrids also use "vigorous" in the description:)
This appears to be a new meaning of the word, but I am all for it. Specifically, I am 70 years old & "vigorous!"
Makes me feel good:)