Thanks Maurice, I will look for something not yellow. I realized this little piece of garden is not the right place for big plants, and I love to see blooms until now, when the wheather is getting colder and days are darker. I want a new home with a nice garden but I'm afraid it won't be before at least two years. In the meanwhile I'm hoping the bigger DLs will grow well even if none of them has a lot of room.
Natalie, I think it would be a pleasure for the eyes to have many clumps always in bloom one next to each other, and maybe in dfferent gradients!