She gives most comprehensive details on the growing requirements for the seed she sells. My favourite is Adenophora takedai, stemming from Japan. Flowering time down here is late August and into October. There are about sixty or so Adenophoras species of these perennials from temperate type regions from Europe and Asia. I have found that they too require good drainage, and if you are living with heat, as I am, compensate by working in 'extra' peat to the mix or soil.
Propagation is best in spring for seeds.
Basal cuttings in late spring can also be tried, as a means of propagation. Some of the smaller species make for good pot culture. For the beginner, these are worth a try. These are both easy to grow and a delight at flowering. Flowering time from seed is most climate dependant, but they should flower in second season from seeds.