Lynchis ('Ragged Robin')

in Plants
I know I've done a few posts, but last one for a while...
I'm wanting to grow some lynchis seeds, but some websites say sow september outdoors and others say sow february indoors...I have no idea, can anyone help please?
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I've grown Lychnis chalcedonica from T&M seeds sown in spring. They took two seasons to flower well and needed staking, but only lasted about 5 years although that may be down to them not liking my clay soil much, or perhaps not getting enough sun (I planted them by an East-facing hedge, so they only got full sun for about half a day.)
Thankyou everyone, how often do you have to split them and do you know how long they take to germinate?
Do you stake lynchis, as I heard online it can be floppy?
It probably depends on variety. My chalcedonica grew to about 3 feet tall and went down in the wind unless staked.