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Products > Syzygium paniculatum
Syzygium paniculatum - Eugenia

This listing for information only - We no longer grow this plant  

[2nd Image]
Habit and Cultural Information
Category: Tree
Family: Myrtaceae (Myrtles)
Origin: Australia (Australasia)
Evergreen: Yes
Red/Purple Foliage: Yes
Flower Color: Creamy White
Bloomtime: Spring/Summer
Synonyms: [Eugenia myrtifolia, E. paniculata var. australis]
Height: 25-40 feet
Width: 10-20 feet
Exposure: Sun or Shade
Deer Tolerant: Yes
Irrigation (H2O Info): Medium Water Needs
Winter Hardiness: 25-30° F
Syzygium paniculatum (Eugenia) - An upright tree that with age can reach 30-50+ feet tall but is most often maintained as a large screening shrub or formally kept hedge. The new foliage, produced nearly year round, is bronze-red then maturing to a 1 to 3 inch by 1/2 to 1 inch wide glossy green leaf. Creamy white brush like flowers appear in the late spring to early summer in terminal clusters and then produce edible rose-purple fruit. Plant in sun or part shade and water occasionally to moderately. Hardy without damage to around 25° F and stem hardy to short duration temperatures to about 20° F though even older plants can perish if temperatures drop much below this or duration is too long. Can be planted in coastal areas with protection from direct ocean winds (Hoyt Zone 3). This plant is one of the most common of hedges in Santa Barbara though huge tree specimens also exist in local parks - a tree at the historical Stow House in Goleta, CA exceeds 90 feet in height. In May 1988 a serious pest, the psyllid Trioza eugeniae (a small winged insect about the size of an aphid) was found near Inglewood in Los Angeles County and by the end of the year had spread to Orange County, Ventura, Santa Barbara, San Luis Obispo and San Diego Counties and by the following year was found in several bay area counties. The most obvious damage that this pest caused was blister-like pits and distortion of the leaves and resulting honeydew from feeding by the nymph stage. The Center for Biological Control at the University of California at Berkeley began looking into the possibility of using biological control of this pest and by 1991 were focusing on a tiny eulophid wasp in the genus Tamarixia that had been brought back from New South Wales, where Syzygium paniculatum naturally occurs. This parasitic wasp was initially released in the Eugenia hedges at Disneyland in July 1992 and subsequent releases were made throughout California in 1993. Though there are still problem areas, such as in cool coastal cities such as San Francisco, or weather conditions such as cooler spring temperatures that effect control, for the most part this parasite has reduced the psyllid populations such that attractive Eugenia hedges can be maintained in the landscape without the use of pesticides. Nurseries must still maintain a program that keeps plants nearly pest free but once planted in the landscape it is best to not spray this plant as the balance of pest and parasite should be established. Occasionally there will be peaks in pest population with some lag in control but this is to be expected and applying a pesticide at these times will likely upset the balance and result in the need for repeated pesticide treatment that would otherwise be unnecessary. Shearing of hedges however can be an effective way of managing this pest, especially if the leaf trimmings with parasitized psyllid nymphs are left as mulch below the plants to allow the beneficial parasite to remain. It has been suggested that a three week interval of shearing and mulching in spring can maintain a pest free looking hedge. We continue to list this plant under the species Syzygium paniculatum though there is some evidence that the plants long grown in California may actually be Syzygium australe. This thought is brought forward in Robert Muller's “Trees of Santa Barbara” (Santa Barbara Botanic Garden, 2005) where he notes in his listing describing Syzygium australe that “This species has been noted as S. paniculatum in previous versions; however, the merged wings forming a pocket, hump, or spur above each node clearly identify it as S. australe.  This description is based on research and observations of this plant as it grows in our nursery, in our nursery garden and in other gardens that we visit. We also incorporate comments received and appreciate getting feedback of any kind from those who have any additional information about this plant, particularly if they disagree with what we have written or if they have additional cultural tips that would aid others in growing Syzygium paniculatum.