Growing Artichokes (Globe)

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19 Jan 23 Darla Herring (USA - Zone 7a climate)
Hi there, We have chaotic weather here in Amarillo, Tx. 4 degrees one night in winter, 60 the next day. Sometimes we get snow, usually we don't. Some winters seem like spring/summer, some are freezing. Then occasionally we get a serious freeze in April and a storm that blows everybody's metal roof off. I planted an imperial star or green globe artichoke 8 years ago - it has nice-looking pink spiky looking flowers. I can't get rid of it and I can't make it produce any more than 2.5" artichokes that are hard and inedible. We get to 108 occasionally in the summer. Why are artichokes listed as ok for zone 7A? Nobody I know can grow them here. Any advice would be greatly appreciated.
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