A Few Yellow Leaves

[Canes1]

Not sure if it's a big deal but I had a few leaves,older ones,starting to turn a little bit yellow maybe a few dark spots, did some research on here and looks like in need of ferts,any help would be great.

Thanks

http://imgur.com/zXB4o5K

 

[robbyjoe01]

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Hope this helps

 

[Justosmo]

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Hope this helps

Annnnnnnnnnnnnd that's saved on my phone now lol

 

[cone9]

Helpful graphic!

 

[mrgrowguy]

Here are a few similar charts if you're interested
 

 

 

 
I realize they are canna plants, but as for deficiencies, they are super similar.
 

 
And sometimes, just adjusting the PH can change what your plant takes in...  Rather, I should say, focuses on taking in.

 
 
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[Canes1]

Thanks guys,it looks like magnesium or nitrogen deficiency. What's the easiest way to fix it.

Thanks