Hello Christine and all,
I have grown Scandinavia in two different states now, NH and MA. It has been in this new garden going on 3 years this fall. Where I have it planted now is not in full sun. It does not get full sun until about 11am or so. It leans just a little bit but then it is also loaded with buds and pods. These plants are clumping up quite quickly and I have usually had at least 6 blooms open each day, today there were 7. I have never staked it. It just went through some very heavy rain yesterday also and looked great this morning.