Answer: Rhododendrons develop flower buds during the summer months for the following spring's floral display. If yours is not flowering in could be that you are pruning at the wrong time or the shrub is getting too much sunshine. Most rhodies prefer to grow in the shade (there are some exceptions) so if yours are getting too much sun they may refuse to bloom. The only other reason, except for the above, is immaturity. Rhododendrons sometimes won't flower until they are 4-5 years old. Maybe next spring yours will reward you with flowers. I hope so!
Arborvitaes are usually hardy shrubs, but they do require excellent drainage. If your soil holds too much water they can develop root rot. Hope this helps you determine just what the problem might be. Good luck with your garden!
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