Koehne Holly Ilex x koehneana 'Martha Berry'

Ilex x koehneana is a cross between I. aquifolium x I. latifolia that results in a broadleaf evergreen holly tree that grows up to 20 feet or more, depending on location. The 'Martha Berry' cultivar ranks among the best of the species. It is a hardy plant with a pyramidal form that is compact, dense, well-shaped, and pleasing to the eye.  The dark green leaves along with the brilliant red berries add to its attractiveness. Locate in an area that is protected from cold winter winds and hot summer sun.

Hollies are dioecious (meaning individual flowers are either male or female, but only one sex is found on any one plant so both male and female plants must be grown if fruit is required). 'Martha Berry' is a female holly and requires a male pollinator nearby to produce berries. According to the Holly Society of America, there are a number of koehneana male cultivars that can provide pollination; 'Loch Raven', 'Jade', 'Chieftain', and 'Ajax' have foliage and a habit very similar to 'Martha Berry', and bloom at the right time. 'Loch Raven', in particular, matches the leaf size and shape of 'Martha Berry' and the leaves of both are deep green.

'Martha Berry' tolerates most soils except poorly-drained ones and can be grown in full to partial sun. It is tolerant of heat and humidity and is drought tolerant once established. Prune in the late winter to control its size if needed. Mature plants do not tolerate root disturbance, so it is best to site the plant in its permanent position, preferably one that provides winter protection for the first year or two.

Insects, Diseases, and Other Plant Problems: 

Not as cold hardy as 'Nellie R. Stevens'. Insects that may affect this plant are holly leaf miner, spider mites, whitefly, and scale.  Leaf drop and leaf scorch may be an issue.  Yellowing of the leaves due to high pH soils can also affect the plant.

The Clemson Cooperative Extension Home and Garden Information Center has a factsheet on common diseases and insect pests.

VIDEO created by Andy Pulte for “Landscape Plant Identification, Taxonomy and Morphology” a plant identification course offered by the Department of Plant Sciences, University of Tennessee.

More information on Ilex x koehneana.