re: honest question…why do so many of you soak your yard with chemicals?

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Is passion fruit a perennial

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Yes. Some varieties are more hearty than others. Some are more cold hearty and can stay green all Winter, unless it is an extended hard freeze. Then they may die back, but come back vigorously in the Spring.

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is it native to Louisiana?

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It is. Some varieties are "more native" than others, meaning it is the type that has always grown in the area. Those types are the ideal ones because they are more adapted to your specific area. You can still plant a variety that is a hybrid or from another area in the country, it just may not be as well adapted.

The LNSP has a list of nurseries/growers on their site. You can can check them out and see the variety of passion vines they offer. I looked yesterday and none of them have any for sale right now, but they do show them on their plant lists.
LNSP - Plant and Seed Resources