Hypericum kalmianum 'Deppe'

Summary

Sunny Boulevard^® forms a tidy little mounded deciduous shrub with small, bright green, strap-shaped leaves that emerged in early May. Maintenance for this cultivar was limited to cutting back stems to 6-8” in height in early spring before new growth started to emerge. In Davis this burst into bloom with bright yellow flowers that continued through July and were very attractive to pollinators. The buff-colored spent flower heads were not at all unattractive and these maintained excellent to very good appearance on all irrigation treatments through the summer and only began to decline into the acceptable to good category in September. In Irvine, the plants never performed up to their potential, and since neither pests nor disease could be identified on the plants, the yellowing leaves and poor performance is most likely due to the reclaimed irrigation water. Because of our observations of poor plant response to reclaimed water at our southern California trial site, researchers were unable to develop an irrigation recommendation for WUCOLS region 3 other than to avoid use in landscapes irrigated with reclaimed irrigation water. In WUCOLS region 2 researchers recommend Sunny Boulevard be irrigated on low water.

Growth and Quality Data

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