What hardiness zone are you located in? Most of the landscape quality yews seem to top out at Zone 7 for hardiness which to me would suggest your thrive/survive qualification may be an issue. I'm thinking would suffer from more susceptibility to insects/diseases; struggle to maintain the density that is so common with the species, etc. Perhaps a microclimate that was cooler than the norm? (Opposite here...we are constantly looking for warmer microclimates. And although we are typically rated below what Taxus sp like, there are many thriving in the Valley due to selective individual placement.
You also have an indigenous species, Taxus floridana, which looks intriguing. Although the link supplied does mention "rare" and "endangered". You never know exactly what that means. Perhaps you could find a supplier and start some. Might be a good project.
http://www.floridata.com/ref/T/taxu_flo.cfm
Sylvia
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