There are a lot of 'self-set' plants in our garden. I suppose technically they should be called weeds. To be honest some of them are so pretty it would be a shame to pull them up. Especially when the seed pods are just as interesting to look at as the blooms.
We live in a valley which leads to the sea. The garden can be exposed to high winds and salty air so many plants can't cope unless they are in a sheltered nook.
Sometimes it's better to let nature take it's course, these plants can take whatever conditions are thrown at them. The local bees seem to appreciate them too.