Houseplants forum→Avocado leaves and stem turning black.

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Glasgow
patdowd
May 31, 2020 6:33 AM CST
Hello,
I have an indoor avocado tree. Its around 4 years old, about 8ft tall. So far its been reasonably healthy, a few brown tips but nothing significant. However, over the last few weeks leaves on lower branches are turning black. This usually starts with the the leaf veins becoming a bright, contrasting yellow. Then the areas around the veins turn brown, then black, and then the leaf falls.
At the moment its only a few older leaves but I've noticed the process has begun on the newer healthy leaves as well which makes me worry its a more serious problem. The stem is also turning black in places. I recently moved it to a sunnier window and so I suspected it might be sunburn, but I'm now wondering if its related to the leaf problem.
If any one has any tips on whether this is a pest/ nutrient/ watering problem then I'd really appreciate it.
Many thanks in advance!
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Name: Will Creed
NYC
Prof. plant consultant & educator
Image
WillC
May 31, 2020 9:47 AM CST
Please post a photo that shows the entire plant and its pot. How do you determine when to water and how much do you provide?

When was it last repotted?
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
I now have a book available on indoor plant care
Glasgow
patdowd
Jun 1, 2020 4:54 AM CST
The pot is around 20l, it was last repotted about a year ago. I usually water when the top inch or so of soil is dry, and I water until it drains from the base. I give it a liquid fertiliser twice during each growing season. It was moved home a couple of months ago and its new spot is south facing and gets a lot of direct sun. Its put on new growth since the move, the top two branches are mostly from the last month, I thought this had probably used up a lot of nutrients so i gave it a light feed about a week ago when the leaf issues started showing. The blackness on the stem appeared a week or so before that.

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Name: Will Creed
NYC
Prof. plant consultant & educator
Image
WillC
Jun 1, 2020 7:24 AM CST
That is one of the older and better-looking home-grown Avocados that I have seen. You have managed to get it to branch nicely.

I suspect your Avocado is simply reacting to its new location. In addition, Avocados will normally lose some older lower leaves as they age. The black spots and streaks on the stems are not a sign of a problem.

Keep up your good care! What are your plans for it as it reaches the ceiling
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
Contact me directly at [email protected]
I now have a book available on indoor plant care
Glasgow
patdowd
Jun 1, 2020 8:53 AM CST
Thanks for the advice! Yeah its quickly outgrowing indoor life but putting it outside isn't really an option. I'll keep pruning it back to keep in a manageable height and hopefully encourage a bit more lateral growth.

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