Potted mint w/spreading black spots/edges NOT rust

chumletteNovember 18, 2009


I just bought a small, healthy-looking mint plant at my local farmers market and put it in large pot after carefully pulling apart the roots, as shown by the farmer. It is in a bright, but not hot window (bright earlier in the day than later). I planted it in Miracle Gro Organic potting soil. It keeps getting large black and brown spots that seem to spread, as well as black edges. Then those leaves look like they are wilting. I'm trying to keep it moist and not too wet/dry.

I did some research and found photos of rust and it does not seem to be that disease.

I wonder if I am watering inappropriately? I tried to let it dry out (even though the farmer told me to keep it moist) but that didn't help. Then I've kept it moist, but that didn't help.

Weirdly enough, I noticed a similar problem on two leaves of my new sage plant also -- and that one is a few pots away from the mint. A coincidence?

I love herbs and would prefer to grow mint myself if possible. I live in a high-rise apartment building and cannot put it outside. We had mint growing practically wild in my backyard as a child and have read of people having good luck with it in a kitchen garden. Plus, I am good with plants, so hope I can figure this out. Many thanks.

I'm not sure how to post a photo, so I included a link to a badly-taken photo of the problem. (I'm not much of a photographer.)

Here is a link that might be useful:

Thank you for reporting this comment. Undo
nygardener(z6 New York)

Plants sometimes get shocked on the move from a cool, humid environment to a warm, dry one. You should let the top half inch to inch of soil dry out thoroughly between waterings. Beyond that, the plant would benefit from cool nights and some fresh air on non-freezing days (and a humidifier during the winter).

    Bookmark   November 21, 2009 at 10:18PM
Thank you for reporting this comment. Undo
nygardener(z6 New York)

A fan creating a light breeze also helps ... and plenty of direct sun.

    Bookmark   November 21, 2009 at 10:24PM
Sign Up to comment
More Discussions
thyme as a house plant
HAPPY 2015 with snow on the ground (just a dusting)...
Why is my basil wilted?
My roommate picked up this basil from the grocery store....
Mold on Dirt
Couple of questions. I am using the Burpee Greenhouses...
Leaning Basil
I have this basil I grew from a cutting and since I...
Where can I get Equisetum arvense or Horsetail
I've been looking for Equisetum arvense or Horsetail...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™