I have done it just like that at times when I have a lot to place in a new bed. More recently I've tried to make a couple beds for just the later bloomers. It always looks too empty when there's one stray late bloomer in a bed of leaves. That way I still have some beds that look colorful when all of the others have ended. In fact I have one in part shade with late bloomers so that one is really late. I also put some of the early bloomers in that bed so that they bloom later so I can use them to make crosses with some of the later bloomers. I do the opposite with some late bloomers that I want to bloom earlier to use for crosses. Those go near the house in my microclimate. So many variables!
