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Don’t be misinformed when it comes to mistletoe

The foliage and fruit of mistletoe.
uc regents
master gardener 12-22-10
The foliage and fruit of mistletoe. uc regents master gardener 12-22-10

A kiss beneath the mistletoe is an ancient tradition, linked by lore and legend to the time of the winter solstice. While mistletoe continues to play its part in our wintertime tradition, it plays a role in the garden as well.

A broadleaf, evergreen plant that produces its own nutrients through photosynthesis, mistletoe is also a parasite that uses its host for support, water and additional nutrients.

Mistletoe reproduces by flowering and producing smallish, sticky white berries, and seed. It is spread when its fruit and seed drop, stick to and germinate on lower branches, or are eaten and dispersed to neighboring trees by animals and birds. Cedar waxwings, robins, juncos and thrushes are among many birds that feast on the fruits of mistletoe.

Mistletoe causes the formation of witch’s brooms, densely irregular clumps of branches, which are used by birds and small mammals for nesting and cover.

Several species of mistletoe occur among landscape trees. Phoradendron macrophyllum grows in ash, alder, birch, box elder, cottonwood, locust, silver maple, walnut, and zelkova. P. Villosum grows only on oaks, and Arceuthobium spp., a dwarf mistletoe, is found on conifers. Healthy trees can generally tolerate some mistletoe. Heavier infestations, though, can lead to stunting or death of host trees.

The most effective way to control mistletoe is to remove branches where it grows. Thinning cuts are recommended, made at least one foot below the mistletoe’s point of attachment.

Pruning of the mistletoe itself will slow its growth and ability to spread to other trees. While it will often re-sprout, it will not flower and produce seed for several years.

Mistletoe can be thoroughly wetted with ethephon, a growth regulator, while its host tree is dormant. This will cause some clumps to fall, though they will often re-sprout. As with any chemical, label directions should be followed carefully.

Resistant species such as Chinese pistache, persimmon, Bradford flowering pear, crape myrtle, ginkgo, liquidamber, and sycamore may be used in or near heavily infested areas.

From our gardens to yours, we wish you all a garden’s delight, and an enjoyable wintertime holiday season.