Please post a picture that shows the plants and their surroundings.

Hello! I took some pictures, this year Cannons Double have zero buds (last year were about 10), 3 others (Rose) - 1 has about 10 buds for the first time and the 2 others have zero again, they have never bloomed.

I have been using fertilize N 16-P5,5-K14 specially for rhododendrons.

As a general rule, having the N (nitrogen) highest encourages leafy growth while P (phosphorus) encourages flowers. However, since you don't say where you are or mention a soil test, I don't know if you even need fertilizer, or what your native soils already have a good supply of. I live in the NE US and don't ever fertilize my rhododendrons since they aren't heavy feeders. I mulch them with organic material such as chopped leaves or shredded bark which will help maintain even moisture levels as well as slowly break down, releasing nutrients at a slow rate. My rhododendrons bloom well.

Yours are also close to the lawn, and most lawn fertilizers are high in nitrogen since one wants the grass foliage to be healthy and vigorous. So assuming you fertilize the lawn, your rhodies may be getting some extra N from the lawn fertilizer, further discouraging blooms. I would start by getting a soil test done to see what your soil is currently providing and then figure out if you need anything other than an organic mulch.

Hi, I am from Estonia. These plants were planted by professionals and they planted them to special soil for rhododendron and conifers - mixed with peat and covered with bark. I dont have good soil in my garden for rhodos. I also have evergreen rhodos and I made for them very big flower bed with same stuff, of course they don't bloom this year (I planted them last summer). I have not tested soil yet. I bought phosphorus and I will try with it. Maybe I really should cut back with fertilizer and see what will happen.

I have to say that I fertilized my lawn this year for the first time.

Thank you all for replying.

Hello! I have new pics now from these plants:

This is the plant that don't develope flower buds or develops only few. About month ago it was green and beautiful green and now it has this. There are 4 that has these signes.

This is the azalea that develops lot flower buds and it is beautiful green.

Next pic you can see it:

And I planted new azalea about 2 months ago (White Lights) and it looks like this:

Is it getting too much sun? It really gets full day.

I have one more pic from previous plants:

It really is very difficult to diagnose problems from photographs, so if there is any sort of rhododendron society or agency that deals with horticultural questions you can call on, that would be a good first step.

The top photograph shows pretty typical leaf spotting from fungal infection. There are a great many possible types of fungus that can cause this, so most gardeners try to ignore it.

Skipping to the bottom photo of the White Lights, the foliage looks abnormal and generally unhealthy. Purely as a guess, I would say that the problem originates with the soil it is planted in. The odd purple color of the foliage suggests some sort of nutritional problem that only a soil test might diagnose with any sort of accuracy.

The. real puzzle is why one of the plants is a picture of health and covered with flowers while the others are clearly struggling. In your first set of photos, the non blooming plants have leaves emerging only from the upper branch tips. This suggests too little light.

rhododendron and azalea difficulties are very often related to soil conditions or planting technique (failure to loosen the root ball, for example). Perhaps the professionals who did the original planting can help you determine what the problems might be.

I planted White Lights to special soil and I did everything by the book..maybe something went still wrong. And I think these conditions that I have don't work for other azaleas, maybe I have to move them.