Ask a Question forum: 3-year-old Yuzu Lemon tree

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Sep 1, 2016 11:15 PM CST
Hi everybody,
I have a 3-year-old Yuzu Lemon tree, which I keep on my balcony facing east. It gets some sunshine up till about noon. Lately, I have noticed white shadows on the leaves, which look like it's been splashed with dirty water. The air outside wasn't clean this summer, some construction was going on the neighbouring buildings, and I thought it might be from the cement dust, but when I washed the leaves, the white dirt shadow stayed on. Can you advise me what it could be? Maybe a lack od a vitamin or mineral? I give to it occasionally N, P, K flower fertilizer, and I think it has all the needed nutrients. Please see the photos and help me if you can; Thanks.

Thumb of 2016-09-02/Gardarik/acfa03

Thumb of 2016-09-02/Gardarik/dd1896

Thumb of 2016-09-02/Gardarik/647820

Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Sep 2, 2016 10:13 AM CST
Welcome! to NGA

A conversation I used to have with my mother in law:
Me: What is that?
Her: Its a Yuzu
Me: Is that a lemon?
Her: No, its a Yuzu

Its a Yuzu. Not a lemon in sight. Smiling

On to your question: The foliage discoloration suggests to me that your plant is lacking in some nutrient or another. Concrete is a base and citrus are acid loving plants. The dust could have altered the Ph of your potting soil thereby making the nutrients in your soil unavailable to your plant. Your tree needs some fertilizer that's acidic. Find some fertilizer specifically formulated for acid loving plants.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Name: Elaine
Sarasota, Fl
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
Sep 2, 2016 11:04 AM CST
I agree with Daisy. Go for some fertilizer that is specifically formulated for citrus if you can get it.

Also, I'd give it another try to clean the leaves. That chalky deposit on them is blocking their ability to absorb sunlight, and you're only giving it half a day's sun as it is.

I use a tsp. of mayonnaise whisked with a couple of tablespoons of warm water on my orchid leaves if they get hard water deposits on them. Put this concoction on a paper towel and rub it on the leaves then wipe them with another dry paper towel. The acid from the mayo will dissolve the deposits and the oil will shine up the leaves again. Don't use straight mayo! It will be too acidic and leave too much oil.

"Success is stumbling from failure to failure with no loss of enthusiasm." โ€“Winston Churchill
Name: Philip Becker
Fresno California (Zone 8a)
Sep 2, 2016 12:35 PM CST
I agree Along with the fertilizer i would give er some used coffee grounds. Good acid. Welcome! I tip my hat to you.
Anything i say, could be misrepresented, or wrong.
Name: daphne
san diego county, ca (Zone 10a)
Million Pollinator Garden Challenge
Sep 24, 2016 9:29 PM CST
it may also be lacking in iron? i always feed my citrus (grown in pots) yuzu, 2 lemons, an orange, bearass lime, and a kaffir lime, general plant food and chelated iron ( either in liquid or pelleted form).
Name: daphne
san diego county, ca (Zone 10a)
Million Pollinator Garden Challenge
Sep 24, 2016 9:31 PM CST
by the way, yuzu makes the best ponzu sauce for fish, or used as a dipping sauce mixed w/somen sauce for sukiyaki.

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