VIOLA SEEDS ARE SELF-SOWING OPPORTUNISTS

I have noticed that violas are opportunists. By that, I do not mean they are invasive but those little seeds will germinate in the most unlikely places. The only time I pull something out of my garden, including the patio, is when I know it is a nuisance weed.  Over winter, I had a pot that had held self-sown violas and everything had died back, or died.  I moved the shallow pot to another position as I thought, think, there are little spring bulbs in it. There was nothing to be seen above the surface of the soil but those little violas must have put down seeds which had dropped onto the pavement unnoticed.  I think it is so lovely. Where else but a garden can you get something for nothing? There are a few straggly bits of grass lurking among them but if I pull them out, it could dislodge the violas and I'm not risking it. 

Self-seeded violas growing between paving slabs

The violas are in a shady spot close the house that gets morning sun, under my Lazy Susan garden furniture.  I would like to pot some up but I fear that if I move them I will kill them.  So, best left alone. 

Self-seeded violas growing between paving slabs