Hardy, Perennial Plants That Bloom All Summer. Hardy, perennial plants that bloom all summer will have your yard looking beautiful for months. Find out about hardy, perennial plants that bloom all summer with help from a certified horticulturist in this free video clip. I'm Donna Emery from Glover Nursery in West Jordan, Utah. Everyone wants hardy perennials that will bloom all Summer. Well most perennials don't bloom for a very long time but this table full does. We have several varieties here that are hardy to zone 5 or 6 and bloom all or most of the Summer. Here at the back is Achillea or Yarrow, we have some Jam.