Pia I look forward to seeing what you find to buy at Fernwood Nursery. We love seeing the European varieties that we can get here. And how wonderful for all of us that you got Semp Fever. You are in good company.
Kelly, I'm not very good at growing semps in containers. There are many here that have great success with container growing their semps, just not me. Now your idea about the cinder blocks might work really well for semps, the blocks would allow them to grow nice long roots. That would make them healthy and happy. Just be sure you put something like gravel down where you set the blocks, so the soil in the block can drain well. I really like that idea. Hmmmm, might have to give that a try. : )
The sedum are very easy in containers, depending on which sedum you use.
Please take photos so we can see what you decided to grow in the pot. The sedum will love it.