Zone: 4 – 9 Size: 4′ wide, 4′ high. Although similar in appearance, mountain laurel and rhododendron do have some distinguishing differences. * Best Compact Rhododendron – ‘PJM’ Rhododendron PJM Rhododendron. In midsummer, feathery plumes of flowers are produced. Classification Mountain laurel (Kalmia latifolia) and rhododendron are … Each 8- to 12-inch plume tops a stalk 2 to 3 feet tall. Rhododendron Another difference is the curling direction for the edges of the leaves. Rhododendrons do not tolerate drought or wet soils (with a few exceptions). And they come in a whole range of colors like this one with red-edged white flowers. Avoid deep shade beneath other trees. Henning's rhododendron and azalea companion plants and how to raise them. Choose a site with dappled shade in sheltered conditions. Most Rhododendrons will tolerate a more open site if sheltered from cold, dry winds. You can find it HERE. 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