Does anyone know what this weed is or is it a herb plant?
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All I know it's newly growing in back yard!
It looks like a weed to me.
wish you had a better picture so better identify the plant in question.
Looks like Purlsane, which is edible, But I would take it to your local Botanical Garden . If none available try a Garden Center
portulaca?
Portulaca oleracea is a perennial plant
It’s not Portulaca. Leaves are totally different. It’s a edible weed purslane. But check with garden center before use
Mimosa pudica.
Yes they grow a pink feathery flower. You can check on internet. Mimosas pudica. When you touch them they close their leaves. When they first discover it they study it and related to circadian cycle.
If there are tons of tiny seeds under the leaves, it may be what our nursery calls Chamber Bitter. It is a very invasive weed that will kill your lawn if not addressed daily. We live in a tropical climate and this weed usually shows up in late April or early May. Mowing without a bag spreads the seeds, making the problem considerably worse.
I would take it to your local nursery and ask.