Hi and welcome!!
I plant several Snapdragons each Spring. Sometimes they come back up and many times they don't. They will usually freeze during the winter unless they are in a protected area.
Anyway, I don't know of any way to spread the plant.
You can buy seeds rather then plants. They come up good with seeds.
Let us know what you try and how it works out!!
Finish each day and be done with it. You have done what you could. Some blunders and absurdities no doubt crept in; forget them as soon as you can. Tomorrow is a new day; begin it well and serenely and with too high a spirit to be cumbered with your old nonsense.
- Ralph Waldo Emerson
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