How to Grow Azaleas

Growing Tips and Varieties

George and Becky Lohmiller
Pink Azalea Flowers

One of many of the azalea bushes in my backyard now blooming.

Suzanne O'Rourke

Known as “The Royalty of the Garden,” azaleas have long been adored for their brightly colored flowers and outstanding form and foliage. Here are a few tips for growing azaleas in your garden!

How to Grow Azaleas

The best time to plant azaleas is in late spring or early fall. Evergreen azaleas do well in partial shade with some wind protection. Deciduous varieties flower more profusely in full sun. 

  • Provide well-drained, humus-rich soil that is slightly acidic (pH 4.5–6).
  • Mulch well. Shallow-rooted, azaleas tend to dry out quickly if not mulched. A mulch of oak leaf mold, pine needles, or aged oak, pine, or hemlock sawdust will keep soil acidic and moist. Read more in our Mulching Guide.
  • Fertilizer isn’t needed. The decaying mulch will provide all of the nutrients that azaleas need.
  • Seldom bothered by insects and diseases, azaleas require little care once established, except for watering during dry times.

Azalea bush

Varieties to Fit Your Landscape

With thousands of varieties, there are azaleas for just about every landscape situation:

  • Deciduous varieties are considered the hardiest, many growing as far north as Zone 4. Some, such as the bright-pink roseshell azalea (Rhododendron prinophyllum), are even hardy in Zone 3. With few exceptions, most evergreen azaleas are only reliable in Zone 6.
  • Low-growing ground cover azaleas such as ‘Joseph Hill’, a bright-red-flowering evergreen that grows only to about a foot.
  • Tall varieties include the white-blooming sweet azalea (R. arborescens), a deciduous plant that can reach 20 feet tall.
  • Weeping azaleas, such as ‘Pink Cascade’.

Azalea flowers

Late-Blooming Varieties

While most azaleas flower in spring, there are varieties that extend the season:

  • ‘Flame Creeper’, an orange-flowering ground cover azalea, and ‘Weston’s Lemon Drop’, with peachy-color buds that open to a soft yellow, both flower in late June or July.
  • The pink-flowering ‘Sweet September’ is an exceptionally late bloomer.

“The Royalty of the Garden” seems to be a fitting name for this beautiful and majestic plant, but we’ve got a hunch that once your garden is filled with the colors and fragrance of beautiful blooming azaleas, you’ll probably think that it’s you who’s getting the royal treatment.

See our Rhododendron and Azalea Plant Guide for more information on how to plant and care for these gorgeous shrubs.

Reader Comments

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Do both beds have the same

Do both beds have the same amount of sun? Do both beds have good drainage? It sounds like one bed may have gotten more soaked from the rain than the other.

Our azaleas are on the East

Our azaleas are on the East side of our house and have been fine for eight years now. These are encore azaleas. Recently they appear to be dying on the under side of the plants. They look great from the top but when you pull the branches aside, the leaves are dead.

If you haven't fertilized the

If you haven't fertilized the plants for a while apply a liquid fertilizer directly to the foliage and roots. Also make sure that your soil is acidic. Light pruning after they bloom next spring will stimulate growth and flowering.

i have 3 tiny tiny azaleas i

i have 3 tiny tiny azaleas i bought from cottage farms,im having so many issues, i finally just stuck them in the garden i have going down my driveway, they will get ALOT of sun from spring to mid july,then they will only get afternoon/evening sun..they r starting to show signs of doing better, but its late july now. are they going to be ok with that amount of sun next yr?they have only been in the ground since july 18 2013..and i have white marble rocks in that garden,r they going to be ok with that?

Azaleas prefer filtered

Azaleas prefer filtered sunlight. Ideally, they get dappled sun in the summer with little or no early morning sun in the winter.  They need sun but not intense, afternoon sun. Perhaps the most important factor is soil preparation. Did you do a soil test before planting? Soil needs have a pH of 4.5 to 6.0--and be moist, well-drained, and well-aerated. Many people find that they need to add amendments that make the soil more acidic. Soil tests are often available for free or a small charge from your local cooperative extension services. The test will tell you what you need to adjust. Fifty percent of the planting medium should be organic material. Finally, azaleas prefer to be set in a place protected from wind. They thrive on the north side of a building or the east side. 
 

I found the information very

I found the information very helpful. Thank you

I have 5 azalea plants in an

I have 5 azalea plants in an outside gardens surrounding a statue. They seem to be doing well, but the leaves are beginning to turn yellow. Is this natural or is something wrong?

If some leaves are turning

If some leaves are turning yellow, do not worry. If most of the leaves are turning yellow, this is often a cue of nitrogen-deficiency. They'll need fertilization. Also, weather can be a factor. These plants not like wet or very dry soils or full sun locations.

My azalea is potted on a

My azalea is potted on a partial covered patio. I have very few leaves and after new leaves appear they start turning black at tips and die off about halfway . Is my soil not acidic enough or too much water. Plant is brought in during winter months

One possibility is soil fungi

One possibility is soil fungi (Pythium and/or Phytophthora) which happens with azaleas in poorly drained or wet soil. Make sure the root ball is dried out--and the roots aren't mushy and rotting. Prune out affected areas, and spray with a copper based fungicide.

I have three azaleas, two are

I have three azaleas, two are fine but one is in an area that is getting closer to full sun than I intended, I live in zone 6 am I going to fry my lil guy?

Azaleas grow best in dappled

Azaleas grow best in dappled sun in the summer with little or no early morning sun in the winter. They like filtered sunlight. However, some varieties, particularly deciduous azaleas, can handle more sun if they are given enough water. You will probably find that an azalea grown in full sun will have shorter stems, and may have more blooms which will not last as long, and which may fade in a few days. If the leaves show signs of being burned by the sun (round brown spots on the leaf tips and edges) or the blooms fade quickly, you may need to move the plant to a little more shade.

I planted four azaelas in a

I planted four azaelas in a mostly full sun area of my yard. They bloomed last year and I didn't cover them over the winter. We also had a lot of rain and they were sitting in some puddles before it got nice outside. I tried to fertilize them this spring but there is no new growth and the leaves are all red and falling off. Do you think that they are still alive or should I just dig them out?

I have several azaleas and

I have several azaleas and they seem to like where they are planted and bloom profusely...then all the flowers die off at once. Is there a way other than picking off each flower by hand to remove the dead flowers?? I have resorted to paying my grandchildren a penny a flower for removal. The kids are quite young and get bored with this project easily....thanks for any advice.

Can I plant azaleas in a

Can I plant azaleas in a shaded are in Arizona, will they tolerate the summer heat and flower next spring?

Azaleas do require partial

Azaleas do require partial sun, so if you plant in an area that gets morning sun and afternoon shade, that would be best. Also, azaleas are acidic soil loving plants. You will need to amend the alkaline desert soil with composted cow manure and peat mixed with equal portions of your soil. And for best results, look for a variety that thrives in your zone: http://www.almanac.com/content...

I have a full sun huge back

I have a full sun huge back yard. I have azaleas planted and some moss. I wanted some ideas of plants that bloom at least all summer or longer and comes back with not a lot of effort. I really would like to have 2 butterfly trees I saw on tv but nobody around here seems to know what I am talking about but they have bushes but they look nothing like the trees. So if there is any ideas and if you know where to get the trees pleas tell me?

Ask your local garden centers

Ask your local garden centers about the "Butterfly Bush" or "Buddleia davidii" varieties for your area. It is a nice choice that blooms from summer through autumn. See more about how to plant, grow, and care for this plant: http://www.almanac.com/plant/b...

I just bought and planted 12

I just bought and planted 12 azaleas and I. Believe they are planted rite, this is my first time. But the second noight they was in the ground we noticed that we had 3 night of 30degree wheather coming and this the night after a heavy rain. My husband and I covered them all with trash bags and when the morning sun rose I uncovered them. I noticed since some of the blooms was wet when covered that the was frozen but otherwise look good. Is covering them what I should be doing for the next 2 nights? And will the frozen pedals be ok or has that damaged the plant? And also if this is all done rite will they bloom all summer this year, there are lots of fresh greens and new blooms as of now? Please help

Covering your plants

Covering your plants overnight to protect them from frost is a good practice. Using trash bags to protect the plants from freeze damage is OK, although it can trap moisture inside that might then freeze on the plant. With trash bags or other plastic, be sure to remove it, as you have done, in the morning before the sun warms the air, or it will get too hot inside the bag and will damage the plant. If you can, it is better to use fabric, such as blankets or sheets, or row covers or burlap (the last two are available at garden nurseries), all of which allow air to circulate but still help to protect the plant from cold.

The frozen petals indicate that those particular flowers are damaged; damaged flower buds may turn brown. If the other buds look OK, then those should bloom fine, and more buds may develop later. The plant itself should be OK; if you see dead, brown or black areas or splitting along some branches, you can prune the dead branches back to healthy wood, just after the plant has finished blooming.

Bloom time depends on the type of azalea you have, as well as your location and growing conditions. Some are early bloomers (such as in February and March), others bloom mid-season (such as April through June), and others are late-bloomers (such as in July through September). You might check with the place where you bought your azaleas to find out what type you have and its normal bloom period.

I received an azalea plant

I received an azalea plant from my mother-in-laws funeral about 3 weeks ago, (Nov.28th). I have kept it moist and inside, (we live in N.Ill.).
My problem is that every time I touch it the leaves fall off. What is happening, and what can I do to fix it? How can I check the acidity of the soil?

The problem might be that

The problem might be that your plant is in shock, from transporting it to its new home. Or, it could be receiving too much water, not enough light, and/or be suffering from cold/hot drafts.

For shock, provide the best conditions possible (see below), and wait for the plant to recover--it usually will.

You might have a florist azalea, which are bred as houseplants. These can exhibit leaf drop if they receive too much water (or too little, which doesn't seem to be the case here). With too much water, the roots will begin to rot, which causes leaves to drop. Be sure that you are letting the water drain between waterings; remove any foil or other wrapping that's around the pot, so that it is not sitting in a puddle of water. Keep the soil evenly moist, but not saturated.

Also be sure that the plant is away from cold or hot drafts, which can also stress the plant. A cool (not cold), bright location in indirect light is ideal in winter, away from heat registers and drafty windows/doors. Mist the plant every so often to maintain a humid environment.

For more information about indoor azalea care, see this advice from the Azalea Society of America:

http://www.azaleas.org/newsite...

To check the acidity of the soil, you can purchase a soil pH kit from a local nursery. Aim for a soil pH of about 5.0 to 5.5.

Hope this helps!

I have an Azalea bush that I

I have an Azalea bush that I got last Easter ... it bloomed until November in the pot on the sunporch and I didn't transplant it to the garden. Now it's dead and won't bloom. I still have it in the pot. One branch is starting to come back and has green leaves. Should I plant it in the ground and see what happens???

If it was a florist azalea,

If it was a florist azalea, first make sure that it is hardy in your area before planting outside. You can check the Azalea Society of America web site for more information:
http://www.azaleas.org/newsite...
As for its dying back and then showing signs of life, I’d say that it would be worth continuing to care for it and see what happens. Perhaps, though, allow it to leaf out a bit more before stressing the plant and putting it outside or repotting (if needed). Keep in mind that some azaleas are deciduous and will go dormant over winter. If this is the case with your azalea, it will come back totally, given proper care, for the growing season. If some of the plant has been damaged, and it is clear that certain stems have died, then you can prune them back to the base (trunk), or to the first healthy-looking bud along on the stem. If there is any green in the inside of the twig, just under the bark, then there is still life there.
Azaleas prefer moderate temperatures (although there are some exceptions), and moist but not wet soil. It’s possible that the heat from a sunporch may have stressed it, if it was a variety that does not tolerate heat well (above 86F for a prolonged period can damage them). Many prefer at least partial shade. Here is more information on the ideal conditions for azaleas:
http://www.azaleas.org/index.p...
If it is OK for the azalea to be planted outdoors, and it is already hot in your area, then choose a cloudy day, after a rain, or in early morning/late evening, to avoid stressing the plant as much.
As another option, bring your azalea to a knowledgeable nursery for them to make a diagnosis. It’s possible that it is only just breaking winter dormancy and all will be well. Hope this helps!

Hi i mite be months late but

Hi i mite be months late but i had the same situation... after a major earthquake hit our place my aunt moved out of her place and left her azalea, wen i took it in it was just a dry stem with not a single.leaf..i am not a professional nor do i have much experien e in gardening, my mom used to do it after she pased i am tryng to learn... anyways back to the topic i replanted it...and now.it bears white flowers... :))) i am sure by now yours must have revived and in full bloom... enjoy :)))

I bought two azalias at a

I bought two azalias at a grocery store. The blooms are gone and I was wondering when it is OK to transplant them outside in the Seattle area? How deep do their roots go? and How much sun is too much sun?

If it was a florist azalea,

If it was a florist azalea, first make sure that it is hardy in your area before planting outside. You can check the Azalea Society of America web site for more information:
http://www.azaleas.org/newsite...

I have two small Azalea

I have two small Azalea bushes that flowered the first year(two years ago). Each year since the blooms and flowers have decreased. what can I do to bring them back? I am not a professional gardener just someone who likes a nice looking yard.

One issue you may have is

One issue you may have is poor soil. Azaleas thrive in acidic soil that is ideally pH 4.5–5.5. Azaleas also do not tolerate deep planting, so make sure they are shallow planted. They require lots of moisture, so remember to water your plants regularly. You can also try deadheading (removing the dead flowers from the plant), but be careful not to damage or remove young growth.
I hope this helps!

When is the best time to trim

When is the best time to trim Azaleas. They have gotten way too large. What is the best way to trim them back? How hard can I cut them Back?

Thanks Very much

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