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The plants known as blue peonies tend toward a lavender-pink hue, not true blue. In the botanical world, plants referred to as blue frequently open blossoms in purple shades. If you search for blue peonies, you'll find that most blue varieties occur in tree peonies (Paeonia suffruticosa).
Consequently, what colors can peonies be?
Peony colors vary dramatically. The traditional tints of Chinese or garden peonies (Paeonia lactiflora) include white, pink, rose and red. Tree peonies (Paeonia suffruticosa) and hybrid Itoh peonies expand the peony color palette to offer shades of coral, deep purple, mahogany and bright yellow.
Keeping this in view, can you dye peonies?
A. Yes and no. The truth is that peony plants don't change in bloom color, but they do seed, and the seedlings often will bloom a different color.
Where to Buy Peonies. Peony bushes can be found at your local nursery or hardware stores. If you want well established flowers with abundant blooms, see if someone has a mature bush you can transplant for maximum blooms. I prefer to work with an established plant over bulbs in Missouri.