What's your question? Ask

Rhododendron Plants

Q.Yellow leaf drop

Zone England | Anonymous added on September 19, 2020 | Answered

Hi, my rhododendrons, but mainly the 8 year old one is dropping leaves that are yellow, some of the branches are yellow too. I fed it in early spring and given a tonic at least 3 times during the summer, the last time being about 2 months ago, but it has been like this the whole summer and now as the weather is cooling overnight, it appears worse.
Also, all the others are experiencing the same including my azalea.
I believe when they require water they also have yellowing leaves, so I have been watering as required.
Also, there does appear to a mild weevil attack going on , but I used a weevil killer for this, although I am not sure if they have been eradicated.
Is there anything else I can do before winter.?
Thank you in advance.

A.Answers to this queston: Add Answer
GKH_Susan
Certified GKH Gardening Expert
Answered on September 20, 2020

It sounds like your plants have a case of chlorosis, or iron deficiency. Amending the soil with sulfur and providing an iron fertilizer will help correct the problem. This applies to your azalea, as well.

Here are articles that will help:

https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/issues-with-rhododendrons.htm
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/common-azalea-problems.htm
https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/yellow-rhododendron-leaves.htm

Was this answer useful?
00

Log in or sign up to help answer this question.

Did you find this helpful? Share it with your friends!

You must be logged into your account to answer a question.

If you don't have an account sign up for an account now.

Looking for more?
here are more questions about...
Rhododendron Plants
Join Us - Sign up to get all the latest gardening tips!

Do you know a lot about gardening?
Become a GKH Gardening Expert

OK