Questions tagged [diagnosis]

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

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18
votes
6answers
42k views

Why has our lucky bamboo turned yellow?

Our lucky bamboo has turned yellow in a very short time, after we've had it for almost 2 years. We've trimmed all yellow leaves, and changed the pebble to clean the green algae - what else can be done?...
22
votes
3answers
13k views

Insect infestation on my pepper plant, what do I do?

I have spotted that one - and only one - of my peppers plants has a number of small black flies of some type hanging around the soil. And while writing this I've just spotted that one (and only one!) ...
16
votes
4answers
19k views

How should a lemon tree with yellowing leaves, peeling bark, and small fruit be saved?

Our lovely lemon tree is in trouble... We live in Northern California. Starting mid-last summer our tree began yellowing. We've called an arborist out to the house but the advice has been pretty ...
9
votes
2answers
25k views

Why is my cactus droopy?

I have a cactus (pictured) which I bought about a month or so ago. It has been slowly drooping, although the tag said to keep it dry in winter and I have only watered it once when I re-potted it. The ...
27
votes
2answers
983 views

How do I help my kitchen window herb garden thrive?

For the last couple of years, I've been nursing along a sort of kitchen window herb garden consisting of cilantro, parsley, basil and chives. What I've done is bought live herb plants at our local ...
13
votes
1answer
4k views

How do I prevent my berry leaves from getting scorched in the sun?

Raspberries are plants that require good exposure to sun. However, my black-raspberry plant has been getting scorched of late. Typical signs of sun-scorching are when the older leaves start drying out ...
9
votes
4answers
4k views

Are my Emerald Arborvitaes recoverable?

I bought 31 thujas a couple of months ago and some of them are really struggling. I installed a drip line a week ago, but am wondering if these trees are completely dead. Here are a bunch of ...
6
votes
4answers
7k views

Ants and white/gray/brown spores all over my gardenia

I planted my gardenia four or five months ago. I noticed, recently, that (a) growth has stunted, and (b) there are ants all over the plant (base, leaves, etc.). There are also white little dots (...
4
votes
1answer
988 views

Identify this Insect or Fungus. Possible Scale

I do not know the name of the plant and I have battled brown scales on my ficus before at my office. What is attacking this plant? Could it be some type of white scale? It is not mealybugs.
16
votes
2answers
2k views

What are these cracks on the bottom sides of my tomatoes?

Recently I noticed the following cracks and small holes on the bottom side of my better boy tomoato plants. I am in Maryland and we have not had a lot of rain the past month however I regularly try ...
6
votes
5answers
7k views

What is happening to the leaves of my Ipomoea (Morning glory)?

What could be the reason to cause this discoloration of the leaves? The discolored parts you see here get thicker over the time until the green color disappears. It does not seem that the leaves dry ...
12
votes
2answers
1k views

What is the problem/disease that causes bobbly peach tree leaves?

What is the likely cause of the bobbly forms on the leaves of a peach tree? Does it matter or is it just some natural anomaly that doesn't affect the tree's health? If is it a concern how can it be ...
12
votes
2answers
3k views

What is this brown, shell-like thing growing on the stalk of my avocado plant?

Could you please help identifying this brown shell-like thing growing on the stalk of my avocado plant? There are several of these. It looks like a little shell (with the appearance of a woodlouse's ...
14
votes
3answers
5k views

Why have my tomato leaves started yellowing at the base?

One of my tomato plants (Better Boys if that matters) has a few leaves that have started yellowing on the lower branches. Not sure if they aren't getting enough water, or if they are diseased or what. ...
7
votes
1answer
8k views

Why are my Dracaena marginata leaves getting brown spots and falling off?

My dracaena has been losing a lot of leaves recently, and it seems to me that they all have brown spots. They turn yellow and then they fall. My mom says nothing has changed in the way she watered it ...
4
votes
1answer
4k views

What could cause brown spots on the leaves of a Song of India plant (Dracaena reflexa)?

As you can see in these pictures our Song of India (Dracaena reflexa) is having some problems. I say it is too much water, while my wife says not. What do you say? Click any photo for full size
4
votes
1answer
2k views

What is wrong with my lemon tree? [duplicate]

Below is a picture of my lemon tree, which now have some sticky web infection. See left corner on the first picture. On the second picture is a close up of something that is being spread from the ...
26
votes
3answers
51k views

Why has my mint plant gone all woody/sparse/stringy?

I grew my mint plant in a pot to contain the roots, and that has worked well for 3-4 months. However, the plant is not really producing fresh leaves now. Is there anything I can do?
17
votes
14answers
53k views

How do I get rid of pill bugs in my vegetable garden (or is it even the problem)?

I have had multiple plants in my vegetable garden that have seemed to just vanish from the garden over the period of about a week. I have notice pill bugs eating the remains of the plants. They seem ...
3
votes
1answer
400 views

Orchids not flowering

I have these orchids that I bought three years ago, and they are not flowering. At the beginning they almost died because of insufficient light in my home. I moved them next to an always-on artificial ...
22
votes
4answers
53k views

Why did my jalapeños turn black?

Last year I grew jalapeños. The fruits were tiny, but I was able to harvest a few handfuls. I noticed that many of them started to turn black on the plant. They were still edible, and they weren't ...
15
votes
3answers
28k views

Why does my cilantro have thin leaves? Why is my parsley not growing? When will they be ready for harvest?

My cilantro (planted outside, full sun from about 11am to 6pm) doesn't have the broad leaves that I see when I buy it in the store. I planted it in May. When should I expect it ready for harvesting? ...
14
votes
6answers
89k views

How do I encourage morning glories to bloom?

I know that many of you will find this unbelievable -- but my morning glories did not bloom this year. For those of you that live where morning glories are a perenial that borders on "weed" this ...
14
votes
2answers
5k views

Why are there kinks in my aloe vera leaves?

On several of my aloe vera plants, the leaves suddenly became kinked. The leaf would get very thin in a spot and bend over. It starts near the tip and is most noticeable on older leaves. What is ...
14
votes
1answer
11k views

Why are my peach leaves turning orange?

During summer, the leaves on my peach tree turn an orange-green shade. Is this normal? Is this a response to heat stress, drought, or something else (e.g. mineral deficiency during high heat ...
13
votes
2answers
4k views

Why are the blooms dropping off my zucchini without fruiting?

As you can see from the pictures the blooms look as if they just release themselves and leave the beheaded stalk. There doesn't seem to be any fruit growing at all. Is there something that I am doing ...
6
votes
1answer
383 views

What's affecting this tomato plant? [duplicate]

Can anyone tell what's wrong with this tomato plant? Is it disease or deficiency? My areas been having issues with late blight the last few years. One spot seems to have a concentric circle around it ...
5
votes
3answers
1k views

What's wrong with my tomato plant?

This is a Great White plant, planted about 30 days ago. It has yellowing leaves with black spots, all tge leaves are drooping, and there are very few flower buds. I'm afraid I might need to dispose of ...
19
votes
1answer
13k views

What is my citrus deficiency, based on leaf appearance? And how to treat?

In the images of my citrus below, you can see the leaves are paling towards the edges. What is the deficiency and how can I fix it? The soil is clay-dominated with some sand and coloured red, ...
11
votes
1answer
6k views

What could be causing rot to appear on the skin of my bell peppers?

I have a set of four bell pepper plants that I am growing in 12" containers in my backyard. They've been growing alright until the fruits on the plants have started to develop what appears to be a rot ...
11
votes
1answer
2k views

What is this tree-like houseplant with long thin leaves? Is it sick?

Can somebody identify this plant? I received it for my Dad's passing and it isn't doing so well. I just moved it and it may be in shock.
5
votes
1answer
49k views

What are these lines on tomato leaves? [duplicate]

I have planted some tomatoes in my garden. The plants have started showing white lines as shown in the picture. Is this some disease? If yes, What kind of disease is this? Is it safe to eat tomatoes ...
5
votes
3answers
28k views

Why are the leaves of my Peace Lily wilted and black?

I recently bought a flowering house plant. I may have watered it too much, me thinks. Since my apartment gets little natural light, I put it outside on the patio the other day in direct sunlight, only ...
5
votes
1answer
595 views

Can anyone identify this infection with my Mango Tree?

The blisters seem to be spreading only to the older (darker, interior) leaves, and the sap is dripping out of the blisters (literally raining down) What is this?
5
votes
2answers
52k views

Why did my young cucumbers turn yellow and fall off?

small cucumbers turned yellow http://imagizer.imageshack.us/a/img537/2604/223Te1.jpg My baby cucumbers turned yellow and fell off. I have 2 cucumber plants that produced 8 cucumbers each, however, ...
4
votes
2answers
202 views

What is this “palm” looking houseplant and how do I take care of it?

I'm not sure what this plant is but I've had it for for 3-4 years. I've watered it about twice monthly and it's right by a giant window. For the last month, the branches have been getting weaker and ...
4
votes
1answer
49k views

Why are my Aglaonema's leaves turning yellow rapidly?

I have an Aglaonema (also commonly known as a Chinese Evergreen) at my desk at work. Over the past month or so, its leaves have been yellowing and dying rapidly. This is how it looked today, a Monday; ...
3
votes
1answer
2k views

Tiny Yellow spots on Dracaena Reflexa Pleomele. What I am doing wrong?

It's not on all leaves, but, let's say, on 70% of the leaves. Well-drained soil. Medium-bright indirect light. I water it every two days, ~250ml water. It was fine a few days back, but now the leaves ...
6
votes
1answer
24k views

A visual reference to nutrient deficiencies in plants [closed]

Often times we cna look at the leaves of a plant to determine what nutrients are missing in the soil which the plants need. It would be nice to have a repository of images with accompanying ...
6
votes
4answers
4k views

What is killing my bell peppers. Holes in leaves and blackened

I live in Montreal Québec and have planted bell peppers in a new raised bed. All was well for two weeks and then the leaves started to cup, develop holes and now are now starting to have black marks ...
12
votes
5answers
134k views

Why is my new Acer tree dying?

I recently bought a small red Acer and moved it into a more permanent pot. It's about 2 1/2 feet tall and since I've moved it, the leaves have started to brown and shrivel like a dead leaf would in ...
9
votes
2answers
8k views

What is happening to the leaves of my avocado?

I have an avocado plant in my outdoors balcony. It's been growing nicely, but there are small brown dots/holes in the leaves for some time now. I don't see anything in the underside of the leaves, and ...
15
votes
1answer
42k views

What causes black spots on my apples?

I've got an apple tree in the garden which has produced a good crop, but most of the apples are covered in black spots: What is this? It seems to be some sort of fungus, but what's the best way to ...
14
votes
2answers
368 views

What is causing this damage on my apple tree?

UPDATE On inspecting all the other branches, I found one of the branches in the following state. It shows the bark beginning to fall off the tip, explaining how the other branches have developed.I cut ...
14
votes
6answers
68k views

My indoor plant has an orange mold-like substance growing on it and has tiny white bugs. How can I remove it?

I have my very first plant in my cube and it seems to be doing just fine. However, there is an orange mold-like substance growing on the top of the soil, and I can see a few tiny white bugs crawling ...
12
votes
5answers
150k views

What causes cucumber leaves to turn yellow, brown, wilt, die, and the plants to stop producing?

Every year it seems my cukes will go gang busters then suddenly the leaves turn yellow (starting with yellow spots), then turn brown, wilt and slowly die off. This all happens from the root crown and ...
12
votes
2answers
4k views

How can I revive wilted water basil plants?

I bought these basil plants from the store. They looked a little droopy and wilting. They came with several bunches and they were half off and discounted because they've been there in the store so ...
11
votes
1answer
6k views

Why does my pepper plant have yellowing, drying and curling leaves?

One of my pepper plants has so far suffered from pests, blossom end rot and odd skin blemishes and unfortunately the plant is now taking a turn for the worse and looking rather unhealthy. The leaves ...
11
votes
3answers
42k views

Why does my blueberry bush have brown/scorched leaves?

I recently purchased a dwarf Northsky blueberry bush from a mail order company. When I recieved it, roughly 15-20% of its leaves had the appearance of being burned or scorched; the bad leaves were ...
9
votes
1answer
5k views

What are these red spots on the leaves of my boysenberry plant?

Previously, I had issues with the sun scorching the leaves of my berry plants. Now that the heat has cooled down, those leaves are back to normal. However, a lot of the leaves on my boysenberry plant ...