Dig hole 1.5 times the diameter of the root system, but only as deep as the root system. Be Extremely Careful Not to Plant Too Deeply, meaning the top of the root crown should be above the soil line. Amend planting soil with 3 parts soil conditioner to 1 part mushroom compost.
Rhododendrons, Azaleas and Mountain Laurels prefer and thrive in an environment with a slightly acidic pH and filtered sunlight.
Mulch well with 3"-5" of mulch in a diameter that covers the drip line of the plant. Water thoroughly and remember to water 1x per week if there is no significant rainfall for the first growing season.