Whether your rhododendron is a spring or fall bloomer, fertilize your rhododendron annually in.
To test its draining levels, dig a 12 inches 30 cm hole in the soil and fill it with water, timing how long it takes to drain.
Pruning to facilitate moving. Sometimes large, long-established rhododendrons have to be moved. This is a sizeable but relatively simple job.
For best results, it should be done in the fall or in early spring before new growth begins. The roots are cut back (pruned) with a sharp shovel, leaving a wide but shallow pad of roots and soil. Aug 19, 1. Shear your rhododendrons in the winter when you are doing large cuts. Winter pruning is better for more shocking trims because the plant is dormant, so its energy is not in its leaves or flowers. Cutting in the winter is the best way to ensure that your plant will have new growth after you prune it%(63).
The best time to rejuvenate large, overgrown shrubs is late winter or early spring (March or early April). Heavy pruning in late winter or early spring will reduce or eliminate the flower display for 2 or 3 years. However, rejuvenation pruning will restore the health of the shrubs. The best time to prune healthy, well-maintained spring. Mar 25, So prune these shrubs after they finish blooming before August (again, make a heading cut).
An exception is the Endless Summer The Original Bigleaf Hydrangea (H. macrophylla 'Bailmer' PP15,) and other cultivars in the Endless Summer series from Bailey Nurseries such as Blushing Bride, BloomStruck, Summer Crush, and Twist ‘n’ Shout.
And even if it does, it'll look ugly for years.
A lot of homeowners request pruning services in the fall as part of an overall effort to clean up their landscape before the winter and this can certainly be performed on many shrubs. Pruning bushes around the home can help them look shapely and nice before visitors come for Thanksgiving or those holiday lights go on. Pruning can also help you better prepare your landscape for the coming winter.