Plant organ used for photosynthesis

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14
votes
4answers
11k 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 ...
11
votes
4answers
13k views

Sudden Outbreak of Yellow Leaves on Tomato (and Other) Plants

My mother was in a panic this morning. She called me over to help her with her garden because many of her tomato plants had suddenly developed yellow leaves, many of which (but not all) also have ...
10
votes
1answer
1k 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 ...
11
votes
1answer
4k views

How can I help a sunburned jade tree recover?

I put my jade tree out to get some sun yesterday, and apparently the sun was a little too blazingly direct. Instead of the healthy red edges I was expecting to see, several of the leaves are now ...
9
votes
2answers
922 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 ...
4
votes
4answers
2k 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
1answer
617 views

What are these spots under the leaves in my cut flowers?

I have got a bunch of flowers, and under the leaves I noticed that there are a lot of spots. I do not know what type of leaves they are and I am not sure if the spots are eggs. Should I be worried ...
10
votes
3answers
8k views

What are those red dots on the leaf stems of my cherry trees?

While inspecting another problem I observed that most of the leaves are having two red dots (or very small bulbs, maybe cocoons) at the stems of their leaves: it is something harmful or even a pest? ...
5
votes
1answer
3k views

Leaves at the tip on new branches of my cherry-trees are wrinkled

On my cherry-trees I observed that the leaves of the tips of newly grown branches are wrinkled and inside there is something which simply said looks like black dirt. The leaves do not look damaged, ...
4
votes
1answer
786 views

How to grow new leaves on rubber plant after they fall off

I have a rubber plant that lost quite few leaves shortly after we got it. We've got it back on track and are seeing some new chutes, but I'm wondering if there's a way to grow new leaves on the stems ...
2
votes
1answer
119 views

Should I let my basil leaves age?

Is it okay to let the basil leaves "age"? Like the leaves at the lower part of the stem. I pinch back my basil plant at the top, so the leaves at the bottom doesn't get touched and grow larger. I have ...
10
votes
1answer
3k 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 ...
6
votes
1answer
2k views

Why is my Swiss chard suddenly wilting?

I live in Brooklyn, New York, U.S.A. This Swiss Chard has been doing well so far this season, and all the largest leaves you see here were green and strong as recently as a few days ago. We had the ...
6
votes
1answer
506 views

Why is the foliage turning yellow on this climbing indoor vine?

I've had this plant in water until it grew enough roots and a few more leaves. I'm not sure what kind of plant this is, but its starting to grow longer; when it was only one little leaf when I rescued ...
4
votes
1answer
912 views

Dry brown patches on cayenne chilli plant leaves, leaves starting to curl, tiny black spots

Note: I have posted a previous question regarding my chilli plants, its details may help in diagnosing this new issue. You can see it here: White, fur like strands and spots on underside of chilli ...
12
votes
1answer
8k views

What does it mean if my tomato leaves are curling?

The leaves on my tomato plants are curling up and I'm wondering if they are getting enough water. The leaves are still green and there are tomatoes on the plant, but I didn't know if that was a sign ...
10
votes
1answer
692 views

What causes spruce branches to drop their needles?

I have a spruce tree that has a problem. Every year, some branches suddenly drop all of their green needles and die. I would like to prevent this, but I don't know what the cause is. What causes this ...
8
votes
1answer
700 views

Can I cover an evergreen shrub in winter?

I have a small evergreen shrub that gets frost burn in winter. I had been told to use tar paper on it over winter, but I was concerned that since it is a broad-leaved evergreen it might need light in ...
7
votes
2answers
15k 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 ...
6
votes
1answer
2k 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 ...
5
votes
2answers
133 views

Does my very young Eureka lemon tree have leaf disease?

I have had a small sprout of lemon tree (Eureka lemon, if I trust the label) for a few months, and for the past two it has been looking weak and sick. In particular, it's not making new leaves (...
5
votes
1answer
200 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 ...
4
votes
1answer
481 views

Grapes leaves too dry - is that normal?

Recently I noticed my green grapes leaves don't look too good. There's nothing like scales or ants or any other sign of parasites. Only older leaves are affected, new ones are fine as you can see on ...
4
votes
1answer
2k views

Why are the lower leaves of my tropical Guava yellowing and dropping?

I had a Century Guava (世紀芭樂) shipped over from Taiwan to zone 9 California. It is nearly 6 feet tall. I planted it in the biggest container that IKEA sold, 20 inches wide, 2 feet deep. I drilled many ...
4
votes
2answers
2k views

Why is my Australian Tree Fern's leaves curling up at the ends and looking kind of burnt?

I have an Australian Tree Fern and its leaves are starting to turn 'crispy' at the tips. One branch looks like it's been burnt almost. Can anyone tell me why?
4
votes
1answer
1k views

White, fur like strands and spots on underside of chilli plant leaves

I am growing scotch bonnet, jalapeno and cayenne pepper plants indoors from seed. The scotch bonnet plants have what looks like white fur growing around the veins on the underside of their leaves. ...
3
votes
1answer
314 views

Which plant is this? “Dead ends,” pruning, watering tips

This plant has been in my possession since last summer (I moved into a new, and otherwise empty, apartment one year ago). I wanted to keep it, but because there are no labels, I decided to water it ...
2
votes
1answer
523 views

Golden Pothos Leaves Are Regularly Dying

I have a very interesting set up and had questions about the differences across our factory floor. We have three columns of Golden Pothos that are numbered about 96 plants (unless the irrigation ...
2
votes
1answer
853 views

What is wrong with this tomato plant with yellow and black spotted leaves? [picture]

What is wrong with this tomato plant? The yellow with black spots has been spreading through the plant. I am hoping someone knows exactly what this is and how I can treat it or prevent it.