Heat knocks it out in Texas every year as well. I have found that it lasts longer and is happier if I plant it in a morning sun, shade the rest of the day spot. It usually makes it till late June or so, then those green caterpillers come along that turn into some kind of butterfly either painted lady or black swallowtail and at that point, I let them enjoy because the heat would take it out in the couple of weeks anyway.
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