Lychnis Chalcedonica

Lychnis Chalcedonica

At a birthday party this weekend my children received some starter kits of seeds, pots, and dirt for Lychnis Chalcedonica, aka Maltese Cross in their goodie bags. I looked at a couple sites for information and they seem fairly simple to take care of, I've just got a few specific questions that maybe you guys can answer for me. 1) What is the germination time? I've got a very impatient 4 year old on my hands and "a long time" isn't a specific enough answer for her. 2) If I transplant these out to my garden are they going to go crazy on me and take over the neighborhood? I'm bordering between zones 6b and 7a. Thanks!
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