Do Pin Cushion Plants Spread?

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Early spring I purchased a small flat of purple pin cushion plants. Rarely do I get my fresh plants into the ground quick enough. As usual these plants were almost dead before I got them planted, but I planted them anyway hoping some expected rain would wake them up. That didn't work, in fact they all turned black and died and disappeared. Recently, after several months passed, we got a day of rain. Afterward, I noticed that I had some purple growing with my other flowers. When they got bigger, I noticed they were the pin cushion plants that died early spring. To the left of the larger one, (the one on the top right), is several smaller plants. I'm wondering now whether they are a spreading plant? It could be that where the others are growing I planted the remaining flat of plants which were about nine to twelve. At this late date I don't know where they all got planted, so I don't know if they are only growing where they were planted originally, or whether they've spread under the soil. Does anyone know whether this is a type of plant that spreads? I'm pretty sure they are annuals and it may only be perennials that spread at all. I'm just happy to enjoy some of the purple color before it snows. In that section I also have a Bearded Lady on the far left, (currently bloom-less), a pink annual similar to a Selvia, a Delphinium to the right of that, and on the far right a Dianthus, which is still blooming. Content and Image: © Marsha Musselman 2015. All Rights Reserved.