An organic mulch would be more effective in maintaining more consistent soil temperature and moisture level. Peonies in the ground or in really large pots that are ESTABLISHED are full sun plants, newly planted or in smaller pots not so much as the roots can overheat and they don't have the little feeder roots to replenish the storage roots that those established plants do—double whammy on them. Leaf-tip browning is an annoying condition that commonly affects certain types of houseplants. Leaves can exhibit severe leaf-scorch symptoms in the absence of high concentrations of Xf, and there is no apparent relationship between the severity of leaf-scorch symptoms and Xf concentration. The plants go dormant early, preventing them from building up food preserves. Spider plants, tropical plants, and those with long, strappy leaves are especially susceptible. Leaf scorch is a non-infectious, physiological condition caused by unfavorable environmental situations. In general, the yellowing becomes increasingly severe and tissue dies and turns brown at leaf margins and between veins (Figure 2). Like most plants, peonies like cool roots. Symptoms commonly appear as yellowing between veins or along margins (Figure 1). In filtered light, however, peony foliage continues growing into late summer or early fall, storing energy for the following year’s blooms. Leaf scorch is starting to show up primarily on maples around the state. The problem may appear on almost any plant if weather conditions are favorable, such as high temperatures, dry winds, and low soil moisture. Feed once a year with a slow release fertilizer. They are planted in a bed that has been soil tested and amendments added as advised. This year, the wet spring may have compromised root systems so that they are now struggling to provide the moisture needed by the leaves. To ensure great the eyes of the Garden Peony need to be planted about 1 ½ to 2" below the soil line. This is the stage at which injury becomes easily noticeable. This reduces flowering the next year. I have three new peony bushes I planted this spring. Leaf scorch is most often restricted entirely to marginal areas and tips. About 3 weeks ago I noticed a red tingle to the leaves of one of the plants and thought it was the plant going dormant and showing fall color but it seemed too early. This is not a disease but rather a physiological problem associated with damaged roots, storm damage, limited soil area, or hot, dry winds. Peonies grown in full sun often suffer leaf scorch by midsummer. The main difficulty when confronting leaf-tip burn is to remember that it's a symptom of a larger problem (usually a cultural issue) as opposed to a condition in itself. It is not caused by fungus, bacteria, or virus. I concur with Gardengal that it looks like leaf scorch, possibly due to excessive heat and insufficient watering, with the rock mulch intensifying those conditions. 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