This is the Florida NATIVE porterweed. I can not stress this strongly enough! There is much confusion over this, and many, many people think they have the native porterweed variety when they in fact DO NOT. Nurseries sell many mislabeled plants and they aren't even aware of it. There is much conflicting information on the Internet about the difference between this and the non-native, invasive variety. Plant databases have misinformation on the subject. And there is even much confusion over the name of the native species of porterweed. So be careful out there!
There is one sure way to tell the difference. The native variety ONLY gets 12" in height, or 18" if you count the bloom stalk. If you have a blue (or other colored) porterweed, which is over 2' tall, then you have a non-native, very invasive species.

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