RpR said: Does purslane act differently where you are at?
I had, have, it in my garden.
I used to go around pulling it but one dry year after not getting into the garden for a long time I stared pulling heavy tall purslane.
I found out that under the purslane the garden was cooler and quite moist.
After I pulled in that area of the garden the plants started to show signs of heat distress they had not before.
Now purslane really, beyond being there does not really do much harm, so I quit the continual pulling and for the most part now only pull it if it comes up with crab grass that infests my garden.
It is good in salads.
In the lawn, it has never spread into my lawn.
As far as I know it is not a plant that will thrive in a crowed environment, at least not up here.