Tag Archive for: sunburn

Sunburned Citrus: Common Signs of Sun Damage

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The Sunburn Experience: Not Just for Humans

Have you ever had a sunburn? Maybe a better question is, “Who hasn’t?”

Well, did you know that many plants get too much as well?

Sunburned Citrus: A Common Concern

On a recent visit to a client who was worried about her newly planted citrus trees.

new citrus trees planted in pots.

Sunburned Citrus

The Leaf Yellowing Dilemma on Citrus Trees

This particular client has a large courtyard with several new citrus trees in pots. Her citrus trees, planted in spring, showed yellowing as summer progressed.

sunburned citrus leaves

Now yellow leaves can indicate a number of different problems.  In this case, the diagnosis was rather simple – her citrus tree has a case of sunburn.

Common Signs of Sunburned Citrus and Other Plants

– The areas of the leaf that are yellow are in the center and NOT along the tips or edges.

– Often, the yellow areas begin to turn brown.

– Signs normally occur in the summer months.

– The sunburned leaves are usually located on the south and west-facing parts of the plant.

– This particular citrus tree is in an area that receives reflected, afternoon sun.

Citrus-tree-in-container-ASU


How to Prevent Sunburned Citrus

In this case, the solution is simple. Move the citrus tree to another part of the courtyard that receives afternoon shade is all that is needed to prevent further sunburn damage. Another choice is to put 50% shade cloth on from mid-May through September.

Citrus do best when planted at least 10 – 15 ft. away from walls. Unfortunately walls absorb the heat of the day and re-radiate it out.

Avoid planting where they get the full force of afternoon sun.

Are Your Roses Feeling The Heat?

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sunburnt roses with dog

Photo: Roses Feeling The Heat , My Abraham Darby shrub rose and my little dog, Tobey.

Challenges of Hot Arid Climates for Roses

If you live in a hot arid climate, chances are that your roses are feeling the heat and aren’t looking their best right now. While gardeners in cooler climates celebrate summer with beautiful rose blooms, the opposite is true for those of us who live in the desert.

Surprisingly, roses actually grow quite well in hot, southwestern zones, and even though mine look somewhat sunburned – I’m not worried because this is normal. Understanding proper irrigation makes a big difference, but roses feeling heat will still have concerns.  

Effects of Roses Feeling Heat with Intense Sun and Warmth

You see, roses that are grown in the low desert regions, don’t like the intense sun and heat that summer brings. As a result, the flowers become smaller, and the petals burn in the sun and turn crispy.  By July, you are unlikely to see any new roses appearing until Fall.

roses with leaf burn

Impact on Rose Plant Leaves

The rose blooms aren’t the only parts of the roses feeling heat concerns in summer – the leaves can become sunburn.  

The sight of brown crispy petals and leaves may make you want to prune them away, but don’t.    

Why?

Avoiding Premature Pruning

Pruning will stimulate new growth that will be even more susceptible to sunburn damage.  Second, the older branches and leaves will help to shade the growth underneath the sun.  

Strategic Pruning Schedule will Help Roses Feeling Heat

I know that it is very hard not to prune away the brown leaves – I feel you. However, in September, pull out your pruning shears and prune back your rose bushes by 1/3. This removes the sun-damaged flowers and leaves and stimulates new growth. 

beautiful rose bloom

Comparative Benefits of Hot Arid Climates

If you lament the less-than-stellar appearance of your summer roses feeling heat, and think it’s easier to grow roses in other climates, you would be wrong. 

Oh, certainly, we have to deal with our roses not looking great in the summer.  But, compare that with gardeners in other regions who have to deal with the dreaded Japanese beetle that shows up every summer and eats their roses. Or, people who live in more humid climates and are having to deal with severe cases of blackspot or powdery mildew (white spots on the leaves).  

Blessing of Dual Bloom Seasons in the Southwest 

Lastly – we are fortunate to enjoy two separate bloom seasons for our roses.  In fall, when many other gardeners are putting their roses to bed for the winter, ours are getting ready to bloom a second time that year.

hot pink roses

And so, I will ignore my less than beautiful roses this summer, because I know that they will look fantastic this fall It is that simple 🙂

Two New Roses Find a Home in a Desert Garden

How to Protect Citrus Trees from a Heatwave

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Protect Citrus Trees From a Heatwave

Living in the desert southwest has its perks, I am blessed to be able to grow a variety of citrus trees in my garden and they do very well under most circumstances because I protect citrus trees during hot weather.

However, when temperatures outside of the average highs and lows occur, steps need to be taken to protect them. With this week’s record-breaking highs, my orange tree has been suffering as is evident from its sunburned leaves. So I thought, this is a great opportunity to talk about how to protect citrus trees from a heatwave.

Citrus tree covered with burlap in order to protect it from extreme heat and sun

1. Protect Citrus Trees Provide Temporary Shade 

Sunburn isn’t just a human woe; it affects citrus trees too. The west and south-facing sides of citrus trees are susceptible to sunburn during a heatwave. This shows up as yellowing or browning on the leaves on those sides of the tree. Sunburn can also occur on immature citrus fruit, so it’s important to protect them.

Burlap is a Great Shade Cover for Trees

While spraying citrus trees with sunscreen isn’t an option, adding temporary shade is, especially for citrus trees facing south and west that are particularly vulnerable. Put a large piece of burlap over the tree, focusing on those south and west-facing exposures. Burlap is lightweight and inexpensive. It allows some sun to penetrate, which is important, without overwhelming the tree. You can purchase burlap at your big box store, nursery, or Amazon (affiliate link below).

Burlapper Burlap Garden Fabric (40″ x 15′, Natural)

Shade Cloth Protects Citrus Trees  

Shade cloth is an adaptable guardian against sunburn. Whether draped over a scaffold or enlisted to shield neighboring plants, its sun-blocking power proves invaluable during heatwaves. You can easily use a bed sheet in place of burlap for temporary shade. Another option would be to place a shade tent/canopy to help block the sun’s westerly rays.

Shade cloth is very useful as a sun shield when placed on a scaffold or other support – it also works great to help protect other plants in your garden.

Protect citrus trees from a heat wave by watering regularly

2. Increase Irrigation and Water Early to Protect Citrus Trees

When temperatures soar above normal, citrus trees, like most plants, lose more water through their leaves. As a result, their regular watering schedule isn’t enough to meet their needs, so increase the frequency of watering as long as the heat wave lasts. 

The Morning Watering Advantage for Citrus

Watering isn’t just about quantity; timing matters. When you water is vital as it is difficult for plants to uptake water in the middle of the day. This is because all of their resources are dedicated to enduring the stresses of the heat and it’s hard for them to divert those to uptake water. Water in the early morning, will allow them to build up a water reserve that will help them bolster their endurance throughout the day.

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Restoration after the Extreme Heat and Sun

When the heatwave subsides, it’s time to bid farewell to temporary shade. Remove the temporary shade in order to protect citrus trees for cooler conditions. As temperatures stabilize, return to your usual watering schedule. By implementing these two proven techniques, you’re empowering your citrus trees to defy the scorching grip of brutal summer temperatures and minimize any negative effects.

Beyond Heatwaves: Year-Round Trunk and Bark Care to Protect Citrus Trees
 

Remember, safeguarding citrus trees transcends seasons. Ensuring your trees’ trunks and bark receive proper sun protection is a year-long responsibility. Explore this previous blog post for insights on why and how to provide this vital shield.

Reading The Leaves: Diagnosing Common Plant Ailments

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Did you know that you can often tell what is wrong with a plant by looking at its leaves?

It’s true.

Diagnosing Common Plant Ailments

Photo: Manganese deficiency

‘Reading the leaves’ to diagnose common plant ailments isn’t hard to do if you know what symptoms to look for.

Problems such as iron or nitrogen deficiency are fairly easy to identify as is salt and sunburn damage.

Read on to learn how to diagnose these problems in your plants in my latest Houzz article:  

What’s Wrong With My Plant? Leaves Often Hold the Clues

Replace Thirsty Flowering Annuals with Succulents in Containers

Even Citrus Trees Need Sunscreen to Prevent Sunburn

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Citrus Trees Need Sunscreen

Last week, I was visiting one of my favorite clients when I noticed that one of her citrus trees was showing signs of sunburn, which led to me explaining to her that even citrus trees need sunscreen to prevent sunburn in many cases.

Citrus Trees Need Sunscreen or they can become sunburnt like this tree

Recognizing Sunburn Symptoms

You can see the lighter-colored bark and some cracks as well along the branch. It turns out that citrus trees are very susceptible to sunburn.

Why Sunburned Citrus Trees Are a Concern

So, why is a sunburned citrus tree something to be worried about?

Well, when a tree becomes sunburned, it often forms cracks in the bark and within these cracks, damaging insects or fungus can find a nice home.  Frost damage can also cause cracks in the bark.

In recent years, I have had to deliver bad news to people whose citrus trees became infected with sooty canker, which is a fungal disease that affects the branches and trunks, which takes root underneath the cracked, flaky bark.

Citrus Trees Need Sunscreen and often develop sooty canker without proper protection

Managing and Protecting Your Citrus Trees

Several times, I have had to tell homeowners that their much-loved citrus tree was badly infected with sooty canker and had to be removed.  You can read more about the signs and treatment of sooty canker, here. Citrus can have many types of concerns. Sunburn is a concern as well, but you can protect your trees.

Preventing Sunburn; Citrus Trees Need Sunscreen

Thankfully, there are things we can do to reduce or eliminate the chance of sunburn to our citrus trees. Citrus trees need sunscreen.

Citrus trees with full rounded growth

1. Encourage Lower Branch Growth

Allow citrus trees to grow their lower branches. They will help to shade the trunk.  A bonus for citrus trees grown this way is that the most fruit is produced on the lower branches that also tastes sweeter.

Citrus Trees Need Sunscreen painted base

2. Use Protective Measures

Protect exposed trunks and branches by using citrus paint (available at your local nursery) or by simply mixing white latex paint water so that the resulting mixture is 1/2 paint and 1/2 water. You can also purchase tree wraps made from burlap, which can also help to protect them. Avoid using oil-based paint.

However, if you allow the lower branches of your citrus tree to grow and the trunk is shaded, than you don’t have to paint them. 

over pruned citrus trees

3. Prune Wisely

Don’t over-prune your citrus trees.  The photo above, is an EXTREME example of what not to do.

Citrus trees should be pruned in March, and concentrated on removing dead, diseased or crossing branches. Avoid pruning more then 20% of its foliage in any given year. Remember, that the leaves make food for the tree, which will in turn, produce delicious fruit. If pruning leaves you with exposed branches, then coat them with citrus paint.

**See how to protect citrus from the damaging effects of a heat wave – here.

Even Citrus Trees Need Sunscreen to Prevent Sunburn

A little note about sun exposure: I always wear sunscreen whenever I venture outdoors.  Years spent in California at the beach as a teenager, trying to tan my fair skin did not work.  Now, I try very hard to protect my skin from the desert sun.  I do however, often forget to wear my hat as it does mess up my hair 😉