when to plant the seeds from a pod ?
now or when ?

you need to wait until the seeds mature. This happens when the pods (leave
them on the plant) so a see through silvery white colour (not for a few
months yet up here, but will depend on where you are). Then get them out of
the silvery cases and sow them. They will grow to short, bushy plants next
year, then shoot up higher and flower the year after. They should then self
seed but you will need to repeat the process next year if you want them
every year rather than every other year.
Hayley