This is such a common garden plant and produces seedlings in the most unlikely places for a plant of this size; walls, paving cracks, any dry spot where you might think nothing could grow. If one of your neighbours has this then you probably do too. In our village it lines the roadsides poking out of most front gardens. And what a splash of colour it provides for a good two months. A very useful bee-plant for dry gravelly areas or spots which wont be watered except from above. Bumblebees like this one but check first thing in the morning as this plant will not often have enough moisture to product nectar in the afternoon.
If you dont have it, its actually quite difficult to find in garden centres but we stock it just in case.