RE: Caltrop (Tribulus terrestris)
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Looks pretty? Yes. But also looks pretty weedy. I once considered cultivating this plant. Ironic that the seeds deterred me but you say that is where the goodies are...
I didn't know ash had this use but it reminds me of an anecdote of someone trying to use fire to get rid of the caltrops in their garden!
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It looks better the closer you get! It is otherwise a terrible plant but it does have the ecological role of protecting open soil. I use a thong to pick up the seeds. If you're not an Aussie, that's a sandal or flop flop, not the underwear type thong😁
Burning is about the only way to get rid of them unless you pull them up singly from the taproot.
I'm not an Aussie; thank you for clarifying!
lol...otherwise it would have conjured some strange images...