Questions tagged [diagnosis]

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

200 questions with no upvoted or accepted answers
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284 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 ...
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1answer
307 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?
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0answers
126 views

What is wrong with my Hydrangeas

My hydrangeas were looking beautiful until a couple 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 ...
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0answers
252 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 ...
5
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1answer
1k 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 ...
5
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0answers
294 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 ...
5
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0answers
324 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 ...
5
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0answers
528 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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1answer
61 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, ...
5
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1answer
2k 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 ...
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30 views

Could my courgettes have mosaic virus?

This was my first time (attempting) to grow courgettes. I used Cucurbita pepo Black Beauty seeds and all seemed ok to start with. I possibly planted them out too early (mid April) as had some ...
4
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1answer
83 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
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1answer
198 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 ...
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485 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?
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2k 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
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0answers
203 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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212 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
760 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 ...
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0answers
55 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?
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0answers
2k 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 ...
3
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2answers
57 views

Lilac Tree Branches Suddenly Dying

I have a Japanese Lilac Tree that was fine 2 weeks ago now there is 2 dead branches and 1 that is starting to die. They are not isolated and are random, with the first near the base of the canopy one ...
3
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0answers
25 views

White branches on citrus tree, is this normal?

I'm seeing the branches to my citrus tree turn white. When I cut them, it's all dead. Is that normal or is it a fungus or something ? Please refer to the attached photo. It's happening to several ...
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21 views

NUBS falling off OKRA PLANT

I have healthy okra plants based on leaves and trunk observation, with small buds that are taking too long to blossom. They are planted in 5 liter pots. I found 1 flower that has dried up and fallen ...
3
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1answer
195 views

What is wrong with my kalanchoe blossfeldiana?

I bought this lovely girl for my mom last May at Vons, and kept it alive since then. It's been in continual bloom. It gets plenty of shade and sun, and I bring it inside at night and back out in the ...
3
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2answers
237 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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1answer
538 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
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0answers
38 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
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0answers
47 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
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0answers
208 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
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0answers
241 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
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0answers
637 views

Why are my tomato plant leaves turning brown, shriveling, dying?

This has been progressive over the last 6 weeks, leaves turning dry, brown and getting very thin and shriveling like paper on a Tomato "Blue Berries" cherry tomato plant. The closest I could guess ...
3
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0answers
729 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
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0answers
540 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 ...
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0answers
70 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
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0answers
1k 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
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0answers
626 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
737 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?
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0answers
46 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
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0answers
95 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
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0answers
455 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
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0answers
1k 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
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0answers
270 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
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0answers
17 views

Unknown discoloration on tomato plant: how serious is this?

One of the tomato plants in our garden has discoloration both on the upper leaves and on one or two of the fruit, as here: How serious is this, and how should I address it? Is the plant salvageable? ...
2
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3answers
41 views

What is damaging my tree Aloe?

I've had a Aloe plant for many years, mostly indoors. I finally repotted it a couple of months ago and split most of the pups off. All of the plants seem to have some sort of disease since then, ...
2
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0answers
49 views

What is this dark brown liquid my cat palm is producing?

Today I have noticed that one of my cat palms is producing a dark brown liquid on its stem. It is a female palm, which is producing seeds right now and all the leaves are green and healthy. Since I ...
2
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0answers
17 views

What are these yellow spots on my Melocactus concinnus?

I purchased this Melocactus concinnus online a couple of months ago. I don't remember seeing those yellow spots on the bottom half of the cactus. It's possible, however, that I just didn't pay close ...
2
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0answers
24 views

Tiger aloe, is developing brown spots and is browning

So i have had this tiger aloe for almost a year now. it always seemed fine. but recently it has developed dry spots, and the inside of the plant is browning (see picture). I water it once a month by ...
2
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0answers
11 views

Indoor Palm Browning

I am new to indoor plants. I have an indoor palm I purchased in late January. I am trying to find the proper watering dance with this guy. In some ways it looks healthy as there seems to be new ...
2
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0answers
32 views

Potted herbs dying in small outdoor “greenhouse”

First time plant owner here. I'm trying to get some potted herbs growing on an outdoor terrace, zone 6-7. Intermittent full sunlight ~3-4 hours a day, partial shade the rest of the time. Birds have ...
2
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0answers
45 views

What's wrong with my pilea peperomioides?

I recently moved this little Pilea to a windowsill of a south-east facing window. This means it gets some direct morning sun, whereas before it was in a room with a skylight and only got indirect ...