Let the weeds grow - Oxalis in my pot

The strangest weeds sometimes pop in my pots. The light seeds are carried by the wind and when the find a nice and quiet place to grow (my pots) they take the opportunity to grow.
Sometimes I let them as I am curious to see when they are. And it is fun until they go to seed and then I remove the whole plant before it spreads.

But sometimes I let them be. I used to have a nice Onionweed growing and blooming. It was spreading the seed like crazy, but I like the flowers, so I let it grow in one of the pots.

And then we have this little Oxalis. I have no idea which type it is exactly as there is so many of them looking alike, that I won't even dare to ID this one.

It is small with very bright yellow flowers. Again - the wind must have dropped the seeds and now I see it popping in few pots. I do remove it from the smaller ones, as it would take over in no time. But the larger ones have enough room for everyone and I do enjoy the leaves and the blooms.

I have another Oxalis (triangularis) but that one was planted by me. My one grows like a bush with the leaves emerging directly from the soil. It also have a thick root/bulb that stores the nutrients and it can be propagated by splitting it.
The little yellow one is different. It grows from seeds and has regular roots. It also has ore creeping nature and leaves from from the stem.

This one grows in a pot together with Pachyphytum Oviferum. The succulent doesn't like too much sun so I keep it more protected spot. The little Oxalis leaves give some extra shade too. And of course they just look so cute together!

Bonus:
As I was shooting the plant I noticed a little spider walking around the pot. Little guardian.
I just wish they didn't leave their webs everywhere! Tat's why I prefer jumping spiders :)

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_{Shot with Nikon D5500 + Sigma 105mm lens
All photos, graphics and text are my own.}