Gardening and Landscaping Stack Exchange
Gardening and Landscaping Stack Exchange

Questions tagged [diagnosis]

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

For questions about a plant that's failing to thrive, and where the cause is unknown (it could be disease, pest, or environmental). Ideally, the fullest possible description of the symptoms and growing conditions should be included, as well as close-up pictures of the affected part and other parts of the plant.

Model Questions

These questions are good examples of how to ask an effective diagnosis question. Note the photos and descriptions as well as the descriptive title.

1464 questions
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Found on a Red Cedar. What is it?

We were walking around on our land a few weeks ago and saw these things on some Cedar trees. Never seen them before. Is it a bug in there or something else? We are in Northern KY. This thing was hard, we had several. I cracked one open and it had…
NKY Homesteading
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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 podocarpus.
P. Butler
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I can’t figure out what’s wrong with my aloe

I’m getting worried about this little plant. It was potted about two weeks ago, I watered it on Sunday (waited about a week after putting before watering the plant). Now the bottom leaves are yellowing, and another higher leaf is starting to yellow…
Mollie
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pencil pine trees

Pencil pines are planted in a concrete border and right next to and below our retaining wall, they have grown very tall and the trunks have nearly outgrown the border. What damage will they cause to our retaining wall and garage wall as both walls…
Deb
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Bartlett pears are all shaped like apples this year

This year for the first time all the pears on my 13 year old Bartlett pear tree are in the shape of round apples I am in South Carolina. Is this some sort of a deficiency. The tree looks normal. And the fruit has always been pear shaped until this…
C O
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What are the ideal conditions for Lobelia cardinalis

I have been trying to attract hummingbirds for a few years by planting flowers that they like. Two of these are Lobelia cardinalis and Lobelia siphilitica. They are both said to: be perennial need constant access to water but not to be sitting in…
kevinskio
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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 unexpected cold spells but I kept them covered at night.…
Ginoclock
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Why is my aloe vera plant having plant spots?

My aloe vera plant is having black and brown spots. Help me figure it out .
Aviral Saxena
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Rose rosette starting?

My first scare. I am familiar with new red growth but this. I did just feed a few weeks ago and I am seeing a lot of new growth, new red growth, new green leaves on all my roses. This is a new plant this year and the canes are all small. Noticed…
Jennifer
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What are my new blueberry bushes doing?

I bought 2 blueberry bushes mid spring and planted them in my yard. They now have this new growth I have never seen on any of my other blueberry plants. The new growth limbs are long and thin with lots of small branches. The ends of the branches…
Taz
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Raised bumps on my succulents

Recently I discovered these spots on some of my succulents. It had been raining heavily a week back, and now it's quite sunny. I haven't watered it since the rains fell. The spots are raised, and don't move. Some of the bumps have turned brown while…
Menang Aier
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Old concrete posts

We moved into a 1950's bungalow 18 months ago and first job in the garden was to take down unsaved block wall but every 9' or so was concrete posts held up by concrete/cement that was blue in colour we have since planted a hibiscus hedge (I have…
Cerisg
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What's wrong with my ornamental grape vine?

For the last 2 years my (10 yr old) grape vine has developed a disease which I believe to be powdery mildew. Last year I sprayed early with Bayer Fungus Fighter a few times but no improvement. This year I've been spraying very 2 weeks but it's…
Alan Johnston
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Will grape ivy harm oak and sumac if allowed to spread?

I see what I believe to be grape ivy growing on oaks, sumacs and other chaparral in the San Diego back country. Will this harm those plants if allowed to spread?
Terry Bowen
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Diagnosis - sick blueberry plant

I ask for help on behalf of my mother, who has a potted blueberry plant in her garden: the label says Vaccinium corymbosum, "giant American blueberry". About a month ago my parents left for a week, and since no one was there to water the plants it…
TheMadcapLaughs
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