This holly is susceptible to spider mites and iron and nitrogen deficiencies. It is pollinated by bees and is not self-fertile.ĭiseases, Insect Pests, and Other Plant Problems: The species is dioecious (meaning individual flowers are either male or female, but only one sex is to be found on any one plant, thus both male and female plants must be grown if seed is required). It may not thrive in areas with high heat and humidity (USDA zones 8 and 9). The shrub tolerates drought, shade, air pollution, poor soils, and clay soils and is easy to transplant.
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Plant in the full sun to partial shade in acidic well-drained soil though it tolerates a wide range of soil types, from moist to dry, including clay. With that in mind, some people prefer to plant male Convexa Japanese Holly for the fall and winter foliage, but not the fruit. The female plant does produce a heavy crop of fruit in the fall, which can discolor the foliage. The plant has a slow growth rate, likes to be in the shade, and does not like alkaline soils. It tolerates drought and air pollution, as well as poor, sandy, and clay soils. The fruits are black and not showy and the leaves are usually smaller than the 'Hetzii' or 'Latifolia' cultivars. The plant flowers in late spring and its fruits ripen in abundance in the fall. It is an extremely dense shrub that does well with heavy pruning and topiary, is very suitable for hedging, and grows up to 8 feet high and twice as wide.
It is a cultivar of Ilex crenata, or Box Leaved Holly, and is noted for its pea-sized black fruit and leaves, which are convex when viewed from above. See below DescriptionĬonvexa Japanese Holly is a handsome evergreen shrub in the Aquifoliaceae family. Phonetic Spelling EYE-leks kre-NAY-tuh This plant has low severity poison characteristics.