Rhododendron and Mountain Laurel

With the leaves all off of the trees, plants that remain green show up more prominently.  Two that you are likely to see are rhododendron and mountain laurel, which look similar and are often confused.

 

Rhododendron (Rhododendron maximum) is the large green shrub normally seen along cool mountain streams.  It grows 6 to 12 feet tall and can form large impenetrable thickets.  The leaves are paddle shaped, evergreen, thick and leathery, and around 4 to 7 inches long.  During cold weather they tend to curl in relation to temperature, so the colder the weather the tighter the curl.   During mid-summer there are showy clusters of large white flowers with 5 petals.

 

Mountain laurel (Kalmia latifolia) also grows as a  shrub, but averages  only around 3-6 feet in height.  It tends to grow in dryer areas than rhododendron.  Its leaves are also dark green, leathery, but are only 3-4 inches in length and not as elongated. The flowers bloom earlier, usually May to early June, and appear as clusters of cup-shaped white to pinkish flowers with 5 petals.

 

Both species are considered poisonous to livestock, and are only eaten sparingly by deer and grouse.  Sheep are most likely to eat the plants, but even then only when better food choices are unavailable.  Honey from the bloom can be poisonous, but it is very rare that bees collect enough toxin in the nectar to cause a problem.

 

The wood of both species is very dense and heavy.  It has been used in the past for carving pipes and spoons. Mountain laurel has been called “spoonwood”.  The most popular use for these evergreens is as landscape plants, and many varieties have been bred for show flowers and foliage.  Both rhododendron and laurel prefer a slightly acidic soil.

 

Protection of woodlands from wildfire over the past 70 years has allowed both shrubs to increase their presence and is beginning to interfere with the regeneration of timber and wildlife tree species.  It could be that in the future some prescribed burning may be needed to keep these hardy shrubs from taking over large woodland areas.

 

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