Kings Celebration Grevillea

Grevillea 'Kings Celebration' 

Grevillea ‘Kings Celebration’ at South Coast REC in 2019. Photo: JA Sisneroz.

Summary

Researchers planted #1 sized material at both sites in October 2017. During the winter of 2017-2018, most (21 of 24) plants perished in Davis. Researchers were unable to source replacement plants for Davis and this species was not evaluated there. However, the survivors were left in the ground the until the end of the trial and, anecdotally, they flowered as abundantly and reached sizes comparable to Grevillea ‘Kings Fire’ by the time the trial was removed in October 2019 (Figure 23).

The plants in Irvine were not affected by cold, though they were affected by chlorosis, most likely in response to reclaimed water. (Grevilleas from Western Australia are known for being intolerant of phosphorous.) Over the entire deficit season the high treatment showed significantly more relative growth than the moderate treatment. We don’t put great store by the apparent significant differences in relative growth between the low and moderate treatment in October, because other characteristics of this plant, including a tendency to have branch breakage are likely responsible for the difference.

Quality ratings between the treatments were similar with no significant differences occurring (Table 9a). Chlorosis drove down the foliage and overall appearance ratings.  While the high treatment produced larger plants, the relative growth rate between the high and low treatments was similar; as a result, researchers recommend irrigating Kings Celebration at low water in WUCOLS zone 3.

Growth and Quality Data

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Grevillea ‘Kings Celebration’ at South Coast REC in 2019 showing the vivid blooms which were bee magnets almost year-round. Photo: JA Sisneroz.