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Home Q & A Board Biology-Related Homework Help Zoology and Botany (Moderator: ehd123)
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Danyael Danyael
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9 years ago
I just saw my new bought sunflower like this. I'm new to this. Can I ask why?
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wrote...
#1
9 years ago
This is natural phenomenon
Danyael Author
wrote...
#2
9 years ago
Quote from: nicetell (9 years ago)
This is natural phenomenon

Everything is. What I'm trying to ask is "What Causes It?"
wrote...
#3
Educator
9 years ago Edited: 9 years ago, bio_man
Lack of nutrients in the soil OR too much fertilizer.
wrote...
#4
9 years ago
Upwards Arrow Over-fertilization causes leaves to yellow.

Symptoms and signs of over-fertilization:

Crust of fertilizer on soil surface.
Yellowing and wilting of lower leaves.
Browning leaf tips and margins.
Browned or blackened limp roots.
Defoliation.
Very slow or no growth.
Death of seedlings.
Source  http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/over-fertilization
Danyael Author
wrote...
#5
9 years ago
Thank you.
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