The white stuff looks like frozen dirt but of course it's not cold so it's not that. I'll attach a picture. 

Hi, I am looking for guidance on getting rid of chameleon plant in my yard. I am planning to try suffocating a large patch of it with black plastic and wood chips and then edge the section. And leave it for 1-2 years. Thoughts on that approach? But it has spread elsewhere in my yard too so I thought I'd try chemicals like Round up or poison ivy killer for the less dense weedy parts. Key question: Should I apply chemical to the leaves or can I cut off the stem and paint it directly on the open stem (helps to minimize how much chemical I use). Also I saw there was a Purdue University study in 2022 that found chemicals were not effective. Is that your experience? I have tried digging it out too, but it comes back so fast I cannot realistically keep up so considering other options. what if I keep cutting it at the soil level? would that help or hurt?

Also, I think it spreads by both rhizomes and seeds from the flower. Is that right? That would help explain why it is coming up in random parts of my yard.