I have to agree with you that this isn't such an uncommon plant but for it to be here again this year it is amazing to me. Dichondra isn't supposed to be hardy in my zone 6b. I had an extra Dichondra after planting my pots last year so I stuck it in the ground right here by the front porch. It took off. and covered this area.
This late spring I saw a tiny tendril poke up out of the ground and it took off. I guess with all the concrete around it and our mild winter it enough had life to take off again this year. I like the way it works as a ground cover. It is a tough plant because this area doesn't get much extra water. Just when I have to water the plants in the pot above it. Since this is out front I don't get out there often. Happiness is an unexpected return of a plant.