Questions tagged [diagnosis]

Gathering of information and facts to determine the root cause of a plant that is failing to thrive.

155 questions with no upvoted or accepted answers
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7
votes
2answers
109 views

Orange seedling leaf browning, curling, slowed growth? Please help!

I am a 1st time citrus planter. I planted an orange seedling in some potting mix after it germinated. Within the 1st few wks there was pretty impressive growth of leaves and height. it is now about ...
6
votes
1answer
100 views

Cycad - Zamia fischeri - large chunk from caudex

Advice please on what may have caused this large chunk to be taken from my specimen of Zamia fischeri? Background The plant was purchased about six months ago and I recently (three or four weeks ...
6
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0answers
259 views

Pinus sylvestris yellowing problem

I'm pretty new to gardening and I recently (~2 weeks ago) got a Pinus sylvestris 'Fastigiata' plant and I noticed that some needles started to yellow. Here are a few pics:- The yellowing is mostly on ...
6
votes
1answer
111 views

Roses in clay pot started to go bald

I purchased some roses in clay pots. They were very fresh and beautiful but after a while they were starting to go bald and their leaves turned yellow. What should I do? They are in open air and have ...
5
votes
0answers
417 views

What disease is affecting my Dypsis lutescens?

I received this Dypsis lutescens (palm) plant as a gift last spring, it had only two leaves and it was potted in nursery soil with sand. Recently I have noticed that the outer leaf started to form a ...
5
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0answers
252 views

What caused this red spot on my Haworthia plant?

My Haworthia plant has this strange red spot. I'm not sure what it is - is my plant okay?
5
votes
1answer
471 views

What is happening to our potato plants? (going black, wilting)

We have a row of 3 different heirloom potato varieties, 50 originally, of which we've lost about 15 to a problem we'd like to identify. The following photos show the start of the issue, through to a ...
4
votes
1answer
130 views

What to do for the young avocado plant with brown spots on its leaves?

I've read the answers to two similar questions but as the answers were opposing, i couldn't be sure what action to take. Here is what I have: Here (Figure 1) is my Avocado plant, which i had potted ...
4
votes
0answers
195 views

Cactus shoots drooping and turning olive

Hey Gardening & Landscaping SE, happy to be a new member! I am concerned for my cactus shoots and hope you are willing to help me out. Short version: My 3,5 months old cactus shoots are starting ...
4
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0answers
592 views

Why is my avocado plant dying with brown, decaying leaves?

A few years ago I grew an avacado plant from some seed and some time later leaves started turning brown and fell from the plant. I tried a lot, but landed on the thought that perhaps since it has ...
4
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0answers
308 views

Birch trees with peeling bark and black area on trunks

I am wondering about my trees in our front yard. They seem to be peeling much more than others in the neighborhood and have black patches on the trunk. Any info on what I should do?
4
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0answers
215 views

Why is my Eureka lemon tree losing leaves?

I have an Eureka lemon tree that was doing great over the winter. I repotted it with Miracle grow soil and it has slowly started to drop the leaves and it has a couple brownish colored limbs. I again ...
4
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0answers
547 views

Avocado leaves browning and dying

Anyone know what is going on with my avocado tree last year it was fine i grew it from a seed but this year the leaves have suddenly started browning and dying off and at first i thought i was over-...
4
votes
0answers
593 views

Why did my cilantro leaves get white and patchy?

I grow my cilantro on my kitchen counter with a grow light above. My cilantro starts out looking lush and green but quickly some leaves start getting white patches. It doesn't seem to kill my plant ...
4
votes
0answers
110 views

Why are my germinating mimosa pudicas dying?

I planted five Mimosa Pudica seeds in soil pellet. Three started growing, but two of them died after two weeks. Why, and how could I prevent this? I soaked the seeds in 30-35°C warm water before ...
4
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0answers
240 views

Dead branches and new growth on the same plant

I planted 5 Japanese Yews in the Spring and 3 of them have both dead/dying branches and new growth on the same plant. What would cause this? I live in North Texas. Thank you I believe they are ...
4
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0answers
145 views

What disease is affecting this rosemary?

My rosemary has been looking like this since last summer. It's currently getting worse. New leafs (if it develops any) soon have these white little spots on it. What disease is this? Maybe false ...
4
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0answers
577 views

What are these barely visible white spots and brown edges on my citrus plant?

I have a citrus plant and something else growing in a pot. The something else had some barely visible white mold-like spots for a few months, and now its and the nearby citrus plant's leaves are ...
4
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0answers
53 views

Whats wrong with my Jasminum Sambac?

Why it's getting sick, and what can I do to prevent this? Is this damaging, like spreading to other plants?
4
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0answers
506 views

Why are my bean leaves curled with white splotches?

My beans received fertilizer occasionally in the spring to get them going, and now each plant has several beans growing. However, I noticed that many leaves are curled, deformed (like an old scar), or ...
4
votes
1answer
52 views

What’s wrong with my mango tree?

The mangos sometimes fall off, but most of them develop like a split right in the middle where it’s curved (dry, then it falls off). This did not happen last year. We water it 2-3 times a week, ...
3
votes
2answers
69 views

Why are the new growths on my Sago Palm withering and turning yellow/vrown

I’ve had this sago palm for just over a week. When I bought it, the new growths were already a little bit sad looking, and they’ve since deteriorated. The older parts are healthy and green, and have ...
3
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0answers
78 views

What is wrong with my Hydrangeas

My hydrangeas were looking beautiful until a few weeks ago. Then I started noticing that some of their leaves had these gray powdery looing spots on them, their blooms started having brown spots and ...
3
votes
1answer
56 views

Tomato Plants Suddenly Weak, Falling Over and Yellowing

My tomato plants were doing great till a few days ago. Suddenly they started getting these white patches on the leaves, especially the leaves at the top and new leaves at the bottom. Some leaves, ...
3
votes
1answer
136 views

Is my red oak tree dead? Only suckers growing:(

I need help! I got this tree approximately two years ago May 2017 to be exact and it was fluffy lots of leaves!! However, this year it did not grow any new leaves only suckers, can anyone please give ...
3
votes
1answer
50 views

Indoor plant leaves blackening- help! It may take over second plant

One leaf is almost completely curled and black and the others have started progressing with the same thing. It’s been sitting with direct sunlight by the window during our winter in Maryland. Is it ...
3
votes
0answers
36 views

Buxus sempervirens - Deformed leaves

Can anyone help me? Suddenly my Buxus sempervirens appeared with the new shoots with deformed leaves. I'm in zone 9. It has not been cold though, and yes, it's a lot humidity every night.
3
votes
0answers
40 views

Why aren't my year-old apple seedlings thriving?

I planted a variety of seeds from apples from a local orchard. They have been growing for almost a year. They are about 8" and have suffered aphids and a white powdery fungus. I have sprayed plants ...
3
votes
0answers
146 views

What are these brown and white patches on my jelly bean succulent / sedum rubrotinctum?

I recently bought this jelly bean succulent but I didn't notice these brown and white spots. I really should've check the plant, but I just love succulents and I was too excited. Seems like the white ...
3
votes
0answers
166 views

Kalanchoe - thin leaves and white spots

This Kalanchoe has been losing leaves for a while now, the existing ones seem thin and white spots have appeared. I have repotted it recently and it has shown signs of improvement, but it still does ...
3
votes
1answer
93 views

Browning aloe leaves - what do I do?

My aloe plant is currently browning a little. I reported it about six weeks ago into a cactus and succulent mix. I separated some of the aloe pups to grow, they’re currently doing something similar to ...
3
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0answers
516 views

What’s wrong with my wilting aloe Vera?

I’ve been trying not too water it too often or too little but it’s just looking sad. What do you think could be the cause of this and can it be saved?
3
votes
0answers
379 views

Dark spots on cactus?

My elderly relative has asked me to do a research on her cactus which has recently got these dark spots: I poked them and they are dry and hard when you touch them. There is no liquid or mush. They ...
3
votes
0answers
42 views

Plum tree set fruit but now it's all gone

My plum tree - 4 years old but pruned incorrectly in 2nd year so was hoping for fruit this year - blossomed beautifully and tiny green fruits appeared. Now a few weeks later I can't see any fruit on ...
3
votes
0answers
873 views

What can I do to stop my Avocado from losing leaves?

My Avocado plant's leaves are all turning brown from the tips and a good amount has fallen off. The browning has been progressing throughout the winter (and maybe also before that). I usually water it ...
3
votes
0answers
366 views

How to revive a bonsai that was repotted after it was dying of overwatering?

I have a 15 year old Chinese Elm which I bought last year in April and keep indoors. It is placed next to a window, but due to british weather it doesn’t get very strong light. The bonsai survived ...
3
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0answers
596 views

What is wrong with my cactus? (Red spots)

Is it dying? There are these weird red marks, is this a fungal infection or sunburn?
3
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0answers
41 views

Blackberry Old Growth on Primocanes Dying

My row of Natchez blackberry is experiencing some mysterious die back. These are primocanes, the floricanes have been pruned out for some time. About 6 weeks ago the leaves begin to turn purple, then ...
3
votes
0answers
2k views

Brown spots on herbs - treatment and are they ok to eat?

The leaves on all my garden herbs (mint, sage, oregano, thyme, lemon balm) get yellow-brown speckles from late spring, which by late summer almost entirely cover the leaves. What might this disease (...
3
votes
0answers
77 views

Are these roots healthy or bad?

Related: Tiny Yellow spots on Dracaena Reflexa Pleomele. What I am doing wrong? I am having trouble taking this plant out to examine the roots. I have used some technique to take it out but it is not ...
3
votes
0answers
369 views

What is this substance that looks like red sap on my cucumbers?

I have this weird red sap on a few of my cucumbers. I was wondering if anyone has seen this before? These cucumbers were grown in our conservatory in the back garden (facing south) in pots, grown up ...
3
votes
0answers
941 views

What can cause a Gasteria leaf to suddenly shrivel and turn greyish brown?

I have three succulent plants that I believe are Gasteria. One leaf in one plant has suddenly shrivelled and turned pale greyish brown. Sorry, no matter how I try, the colour in the picture is not ...
3
votes
0answers
238 views

Strange brown/dead spots on leaves?

What I have here is a plant which is being affected by something which is making certain spots of its leaves appear to be unhealthy. Does anyone have any idea what's going on? Is this something that ...
2
votes
1answer
58 views

What are these white things on new leaves?

I have roselle planted. But I see these on the leaves. What are these? Edit: Added closeups
2
votes
1answer
65 views

Why is my lilac tree leaves turning brown already?

I have never seen my lilac bush do this before. It's a very old lilac and Bloom the color I've never seen before. I have lived at this home for 11 years and I've never seen the bush but this bad.
2
votes
1answer
252 views

Why are my Monstera's leaves turning brown and drooping?

I just bought my plant last month, and recently the leaves have been getting brown spots on them and the leaves and stems are weak and drooping close to the ground. I kept it in the same pot I bought ...
2
votes
1answer
26 views

Avacado sprout dying

My seed sprouted but it started to drying out from the top . Not sure what went wrong.
2
votes
2answers
52 views

Why are my aloe’s leaves flattening?

In the past few weeks some of my aloe’s leaves are becoming flat. What is wrong with it? Is there anything I can do? .
2
votes
0answers
27 views

Yellow spots on cactus, brown spines

I have a cactus in which some yellow spots are appearing, some are starting to turn brown even. Then the spines seem to be dark brown on the top and white on the sides. Not sure if that's normal. I ...
2
votes
0answers
20 views

What causes curled leaves in ctetanthe pilosa?

I have recently purchased a small ctetanthe pilosa, about 6 inches tall. I have it inside with morning sun through glass window. Temp outside is cold winter between 3 degrees and 10 degrees at the ...