I don't know whether they are perennial, but it may be a bit late to flower this year. If it does, and if it sets seed, sew them in the spring. They are worthwhlie and, in the right place, will come up year after year.
location: Surrey Hills, England, ex-woodland acidic sand. "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
I sowed some a few years ago and self-seeders came up for several years thereafter. They seem to be very tough, and the little seedling above will come through the harshest winter weather. I never noticed self-sown seedlings being not so vibrant, but perhaps I just didn't notice..
Billericay - Essex
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
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In the sticks near Peterborough
That would have been my guess but they hadn't been planted especially nearby whereas the sedum was.
Perhaps a bird drop a seed.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
They seem to be very tough, and the little seedling above will come through the harshest winter weather.
I never noticed self-sown seedlings being not so vibrant, but perhaps I just didn't notice..
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.