Corsican Mint dying

bonaroJune 10, 2010

I am trying to propagate Corcisan Mint in the greenhouse and have several flats growing like mad. I water deeply every 4-6 days and finish with a shot of miracle grow. There is no chance of frost and I see no rust or powder.

My mint looks like it is frost damaged. Starting at one corner of the flat it is turning brown/black and dying off and its spreading.

What is going on and how do I stop it?

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tsugajunkie z5 SE WI

A picture would help. Do they need water every 4-6 days? Or might they need it more or less often? What strength are you using the fert and is it every time you water?


    Bookmark   June 10, 2010 at 5:15PM
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jean001(z8aPortland, OR)

Sounds like it's rotting.

    Bookmark   June 10, 2010 at 10:29PM
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I guess I presumed that since they were mint they would tolerate wet feet, I could be over watering. The greenhouse gets really warm so I try to not let things dry out.

I use a hose end sprayer to apply the MG

I have separated the healthy looking mint and moved to a shadier spot in the GH. I will water less but opinions are still invited.


    Bookmark   June 12, 2010 at 4:58PM
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dan_staley(5b/SS 2b AHS 6-7)

Not that those pix are helpful, but likely way too wet esp if those are solid trays on a watering bench. Stick your moisture meter in there and see what it sez.


    Bookmark   June 12, 2010 at 8:00PM
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jean001(z8aPortland, OR)

Classic damping off -- too much water.

Shallow containers have very poor drainage. Must have extremely porous planting mix for such containers.

OP said "I have separated the healthy looking mint"
If from the same flats as in the pictures, you very likely moved the disease organisms with them.

You may need to start over with clean containers and clean propagation stock. Then plant into the ground as soon as possible. If needed, protect on site until well rotted into the soil.

    Bookmark   June 13, 2010 at 1:38PM
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jean001(z8aPortland, OR)

Oops! I meant "well rooted into the soil!" (I imagine you figured that out.) :)

    Bookmark   June 14, 2010 at 10:41PM
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