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.

1428 questions
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Why are the leaves of my pea plant (little marvel) drying up and turning brown?

The pea plant (Pisum sativum) was grown in an ebb & flow hydroponics system until it failed; now it's in a deep water culture unit. I noticed that the leaves were turning brown/grey. I thought this may be a disease so I sprayed Daconcil when needed,…
linuxrules94
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What is this anomalous growth on my oak leaf?

I found an interesting lesion on an oak leaf in my back yard (Upstate South Carolina). What is it? I am asking about the marble like structure since I am fairly certain that the larva (shown at link) belong to an acorn weevil.
Dale
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How do I keep "cat grass" alive?

Sometimes I buy a little carton of grass at the pet store for my (indoor) cat to nibble on. She likes it but it always seems to die off within a week or two. I'd really love to have a sustainable grass colony if this is possible. What can I do to…
augurar
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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 on their skin. What could be causing this? I…
Matthew Ruston
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What insect eats petals and what can I do to kill it?

My geraniums loved being outside the front window of my house. They've been thriving there for over two months now and I thought I'd finally found a winner (it's too hot for pansies and other daintier plants). Now they're getting eaten alive. I've…
Michael Todd
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Lemon tree leaf deformation

My lemon tree leaves are deformed and some have holes (see pictures). Any idea what is causing it, and how I can stop it?
Ron Harlev
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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 up until now new, healthy looking leaves have…
Eyal
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Why is my phalaenopsis' keiki (orchid) not thriving?

About five years ago, I bought a fully grown and blooming Phalaenopsis orchid. After a month or so, the blooms fell off as expected. I continued to care for it as directed, but it never flowered again. Instead, it produced four keiki, which I…
samiz
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Why is my cactus purple?

This has been going on for a while (about a year), one of my cacti has turned purple. I've just replanted it after its pot fell and broke (no, it did not spend the year on the ground). What is the cause of this and what should I do about it? I put…
kotekzot
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Why is my pear tree dying around the blossoms?

Shortly after the blossoms fell on my pear, areas around the blossoms started to turn black and die. This is spreading. Although the dead areas tend to be on the end of the branches, there are exceptions where a branch may have 2 or 3 dead zones…
winwaed
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Jade: Can I repot and/or take cuttings?

I've read other questions on this and other forums on Jade plants, and haven't quite found an answer. My Jade plant is 20 years old and about 3" in diameter at the base and 4' high. It seems to never have been sick, except for a sunburn 10 years…
Gordon
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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 ago) repotted it into the current, larger pot. It has…
andrewbuilder
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What is damaging my pepper plant?

I noticed about 4 days ago that leaves on one of my peppers got soft and started to hang down a little. I thought that it just needs some water so i watered it along with my 2 other peppers. Today the same pepper looks like it again needs more…
Michał Górecki
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Why are my basil seedlings failing to thrive?

I have grown basil from seeds in a large pot. They have germinated but are now failing to thrive. They are now about 3 weeks old. They get the afternoon sun and are watered daily. I applied Seasol a couple of times, but am still not having any…
Apprentice Greenthumb
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What would cause branches in the middle of a pear tree to die?

I had a really nice pear tree. Last year I saw a dead branch in the middle of the tree so I cut it. But this year there are a lot of dead branches in the middle of the tree. I'm afraid I'm doing to lose my tree. Is there anything that could cause…
the_lotus
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