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A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

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Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

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Sunday - July 14, 2013

From: Spring, TX
Region: Southwest
Topic: Herbs/Forbs
Title: Is blue porterweed native to North America from Spring TX
Answered by: Barbara Medford

QUESTION:

I recently purchased a blue porterweed (Stachytarpheta jamaicensis) plant from the native plant section of one of our local nurseries. I was surprised when I didn't find it on your list of native plants. Many Google searches show it as a native, while others show it to be an Asian exotic.

ANSWER:

You are correct, our ultimate source for determining nativity is the USDA, and this USDA Plant Profile Map shows Blue Porterweed (Stachytarpheta jamaicensis) as native to the lower 48 states, Puerto Rico and the Virgin Islands but introduced in Hawaii. This can be attributed to many things, but mostly to the fact that our Native Plant Database is alway a work in progress. We are much more embarrassed when we learn that we have listed a non-native as native than we are when it is the other way around, but still, we appreciate your bringing it to our attention.

The USDA source listed above shows it native to Alabama and Florida, so we are a little curious as to why it was being sold as a native plant in a nursery near Houston. Our whole point in advocating native plants is that there are many multiples of different growing conditions in North America - soils, temperatures, rainfall, even the length of daylight. When we answer a question about a specific plant, we always first check to see where that plant evolved and grows naturally, in order to warn our visitor if we don't think it can survive where they are gardening. 

To that end, we will do a little research on the Internet and you can read some of the information we find to determine if you can expect it to do well in Harris Co., TX.

A lot of user comments from the forum Dave's Garden on this plant. Natives for your neighborhood, a conservation website for south Florida. The Leon Levy Native Plant Database -  oops, that's from the Bahamas. "Native" is in the eye of the beholder.

 

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