Beginner Gardening: L.coronaria help pls, 1 by jenzuk

jenzuk wrote:
My friend moved into a new home and she dug up for me about 60 tiny seedlings in april this year and she stil had loads. We discovered the name "Lynchis Coronaria" and from its silvery velvet leaves are stems of bright magenta pink flowers then self seeds afterwards.
As i only have a container garden i was reluctant to bring back so many so i planted some into plastic trays to seperate the seedlings and replanted them just 1 inch apart as they were small and clumped together. I have thrown quite few away like those that were not growing well, had limp or discoloured leaves etc. I now have about 15 large healthy ones at 7x7inches and few medium ones from 4x4inch. The rest that are smaller i will give away with any surplus bigger ones.
My problem is that i dont know the best way to transplant them on as i cant seem to find correct advice i need. Again, i only use containers so no permanent beds etc. Some sites say they grow 8feet tall and wide, others say 3feet, others say its low and ideal for borders. some say no flowers until 2nd year but also that the plant can die back into the ground at winter. Some say perenial others annuals also biennials!
Can anyone give me real advice about my next steps-
*how big will they grow if i treat them to my best? I know that as long as the planter is deep enough, plants can grow roots downwards in right soils so that some plants can be planted closer to each other and not so far apart as in the open.
Is it 1 plant in small container then 2/3 in medium then 4 or 5 in large container so that they are maybe 2inch from each other or is it stil too close?
*do i need them close for more growth and flowers or will spreading them give more?
I just feel it be a shame should all these go to waste!
Is it true that its only foliage leaves this year and flowers dont open until its 2nd year?
*will they die down over winter and grow back or does it just rely on the self seeding for new plants?
Thanks for reading and thanks for any advice