PJM Group is a series of rhododendron hybrids that resulted from crosses between R. carolinianum and R. dauricum var. sempervirens. These hybrids are compact, rounded, small-leaved, evergreen shrubs that generally grow to 3-6′ tall and are noted for having exceptional winter hardiness.
What does PJM stand for in PJM rhododendron?
This rhododendron's unusual variety name stands for “Peter J. Mezitt “, who along with his son, Edmund, started the original hybridization work developing this variety back in the 1930s. The ‘P.J.M. ‘ rhododendron was developed to tolerate northern winters in the Midwest and New England.
How much sun does a PJM rhododendron need?
PJM rhododendron are best grown in an acidic, moist, well-drained soil in part to full shade . Dappled shade is preferred; full sun may result in leaf scorch.
How wide do PJM rhododendrons grow?
Size and form: A hybrid evergreen rhododendron reaching 3 to 6 feet high and wide .
Is PJM rhododendron poisonous?
They are toxic to dogs as well as humans . The leaves are the most poisonous part of the rhododendron plant, but the flowers and nectar can also be dangerous. ... Toxic and lethal symptoms have been seen with doses as low as 3 milliliters per kilogram of body weight for flower nectar, and . 2 % of body weight with leaves.
Where is the best place to plant a rhododendron?
Unlike many blooming plants, rhododendron does not like full morning sun in winter and does best when planted in dappled shade on the north side of a building . Growing rhododendrons are happiest in a location protected from the wind and not under eves of a building.
Do deer eat PJM rhododendrons?
He says spirea, ‘Golden Mop' cypress, pieris japonica, mountain laurel, PJM rhododendron, blue star juniper, barberry and more are all deer resistant .
Do rhododendrons like coffee grounds?
Fresh Coffee Grounds for Acid-Loving Plants
Your acid-loving plants like hydrangeas, rhododendrons, azaleas, lily of the valley, blueberries, carrots, and radishes can get a boost from fresh grounds. ... Don't use coffee grounds on seedlings or very young plants, as caffeine can stunt their growth.
Do rhododendrons like full sun or shade?
Plant in full sun to increase flowers and avoid mildew problems. Shrubs need a minimum of 6 hours of full sun daily. Plant on the sheltered side of a windbreak. If subjected to cold, dry winds, their leaves and buds dry out and die.
Can rhododendron be grown in pots?
Rhododendrons like moist soil, but their roots will rot easily if they lie wet, so make sure your container has plenty of drainage holes . Pot up using an ericaceous compost and keep the container in cool, moist conditions, somewhere where your plant will get partial or dappled shade for most of the day.
How fast do rhododendrons grow?
Some Rhododendrons will experience a fast growth rate (2 ft. per or 60 cm) while others will slowly grow less than 0.5 in. per year (1cm). If you choose plants that are the right size to begin with, they are relatively maintenance free.
How close can you plant rhododendrons?
How to Plant Rhododendron & Azaleas. Plant in spring or early fall. Space plants 2 to 6 feet apart , depending on their estimated mature size.
How long do rhododendrons bloom for?
Coveted for their spectacular blooms which come in a wide range of shapes and colors, Azaleas and Rhododendrons usually proudly display their colorful blooms in spring for about three weeks , depending on the weather.
Why is rhododendron bad?
Its leaves are poisonous to animals . Its foliage is so thick that nothing can grow underneath. In 2014, two experienced hillwalkers had to be rescued when they became trapped in an “impenetrable forest” of rhododendrons.
Are rhododendrons poisonous to other plants?
As far as I understand it, Rhododendrons do not secrete anything that is poisonous or toxic . Nothing will grow beneath Rhododendrons, simply because of the dense shade they create. This will be especially true with groups of Rhododendrons which merge together, and create a dense shade cover over a wide area.
Are rhododendrons poisonous to cats?
Poisonous plants in spring
Azalea/Rhododendron: (Rhododendron spp) Highly poisonous to cats and dogs , even if just a few leaves are eaten.
