Posted: 12/09/2015 at 22:30
Just sow the seeds in March as you would any other seed. You need to pinch out the tops to make them bushy, just the same as any seedling. Plant out beginning of May, just as any new plants. No special treatment, and there are some beautiful ones from seed. Or, you can let the ones you have now go to seed and collect them when they are dry.
the only thing is that they may not come true to the colour of the mother plant, but they are all pretty.
they will grow a tuber through the year, they are amazing when you dig them up at the end of the year.
If you want loads, seed is the way to go.