By far the easiest way to produce new plants from both of those mentioned is by division.
Seed will work well for Astrantia, but plants do not come true from seed.
He calls her the chocolate girl Cause he thinks she melts when he touches her She knows she's the chocolate girl Cause she's broken up and swallowed And wrapped in bits of silver
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Astrantias will self seed and grow lots of extra plants. I always grow from seed,s never took cuttings so not sure about that.
Geums, you can usually just scrape away the soil and tease a piece of root off.
By far the easiest way to produce new plants from both of those mentioned is by division.
Seed will work well for Astrantia, but plants do not come true from seed.
Cause he thinks she melts when he touches her
She knows she's the chocolate girl
Cause she's broken up and swallowed
And wrapped in bits of silver
Beat me to it doc
With the astrantias, division is the way if you want the same plant as the parent. If not - as Lyn says - they'll seed around if they're happy