How do you kill invasive Oxalis?

Pamela Slate via pbs
Wed, 28 Oct 2020 10:10:55 PDT
The two spp. are O. sternorrhyncha and O. purpurea possibly 'Garnet.' The
latter has purple leaves that lay flat on the ground with a pink flower.
 The leaves emerge green, then become purple.

Currently, I am letting them regrow a bit before flooding the bed and
covering it with black plastic that will be sealed and secured around the

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