My tomatoes are dying

hamster_2010July 14, 2010

I have a bunch of tomato plants. They are all about a foot tall, in five gallon containers, and, up until recently, they were looking healthy and happy.

Several days ago, some of them suddenly died. Leaves start to wilt, the stem loses its strength and the whole plant lies on a side and dies, the whole thing happens in a matter of two to four days. In this manner, I have already lost five plants, and one more looks like it's headed the same way.

Here's a plant that's in trouble:

http://i26.tinypic.com/2niso4i.jpg

Here's a dead plant:

http://i32.tinypic.com/k94yw.jpg

No sign of any pests or insects.

Any idea what it could be? I don't think it's under/overwatering, and it seems to be too rapid for that ... My wife fertilized all containers generously with 15-15-15 fertilizer about a week ago, could that be the cause?

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tsugajunkie z5 SE WI

Cooked roots or poor drainage? Have you done this before in black platic bags with that soil? Also appears to be some type of crown rot in the pic of the dead one.

tj

    Bookmark   July 14, 2010 at 9:32PM
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jean001(z8aPortland, OR)

What are the containers filled with? If regular soil, I bet that's at least part of the problem.

    Bookmark   July 14, 2010 at 10:36PM
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Dan Staley

First guess is you are cooking the roots. Fert may have exacerbated stress. First pic looks like ordinary garden soil in bag, not sure why that was done, surely a cause for decline. Second pic looks like cooking the roots and suffocating them in a mixture of garden soil and potting mix.

Containers should be potting mix only.

Dan

    Bookmark   July 15, 2010 at 12:42AM
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hamster_2010

Cooking the roots is an interesting theory. But it's been relatively cool all this time, highs of 80 or less. Yes, it is garden soil (essentially almost pure sand) mixed with some compost. I have a bunch of grape vines happily growing in that mix. I have one bag with a tomato planted in potting mix, that tomato does quite poorly. The biggest tomato plant I have grows in pure garden soil without any amendments.

I flushed the plant in the first picture with a couple of gallons of water, to get some of that fertilizer out, we'll see what happens.

    Bookmark   July 15, 2010 at 8:28AM
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Dan Staley

Cool temps are one thing, black surfaces absorbing maximum solar incident radiation is another. Combine that with garden soil in containers inhibiting moisture movement and harboring pathogens, and you have an excellent chance for encountering problems.

Scroll thru the 'Container Gardening' forum on this board for discussions on the issues with native soil in containers - should be ~hundreds over the years.

Dan

    Bookmark   July 15, 2010 at 9:59AM
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