tomato leaves turn yellow and purple

karthikasJune 23, 2012

Dear all,

I am an amateur gardener. I have some pots in the balcony and I grow flowers and herbs like mint. I do not have problem with them. A month back, I planted some tomato seeds (just the seeds from store-bought tomatoes) in a pot and used the normal soil got from a supermarket. It says that nutrients in it are sufficient for 4-6 weeks. But, the supermarket lady warned me that it will not be sufficient for plants yielding vegetables and fruits and said I need to top up with fertilisers later.

The tomatoes plants grew; there were many plants in the same pot and all was well till a couple of days back. The leaves at the bottom of the plants started turning yellow. Very soon, the whole plant had a purplish hue. And the underneath of the leaves (veins) turned dark purple. A couple of leaves have shrivelled up almost died. In some places, I can see yellow and purple patches. I googled for info, but I am unable to decide whether it is a phosphorous (or some other) deficiency or a disease. Could anyone here kindly help me?

The temperature here varies between 10 and 25 deg C now.

Thanks in advance for all your replies!


Thank you for reporting this comment. Undo

My recollection is that phosphorous sounds right for purple. And perhaps nitrogen for yellow. Determinate tomatoes get to be big plants. Indeterminate tomatoes make determinate tomatoes look small (7 to 10 feet). The "pot in a pot" looks small for a big plant. I'm thinking you need to fertilize.

Add some NPK, add some mirco-nutrients if possible, fish/kelp fertilizer is good. Micro-organisms in the soil is good.

Compose is good. Tomatoes can be buried deep, the underground stem grows roots. So at a minimum you can toss a bunch on top next time before you water. If you are going to transplant, mix it in the hole.

I'm trying a dose of old horse dodo this year for each plant. Plants are big, have flowers. It may nave been too hot to set fruit in the past week.

    Bookmark   June 23, 2012 at 7:39AM
Thank you for reporting this comment. Undo

Clay is correct about the purple being phosphorous deficiency.

The other glaring problem is if you had many plants in a pot that size there would be too much competition. Realistically, 10 gal pot is the minimum size for 1 indeterminate plant (I would recommend no smaller than 25 gal. but many people claim success at 10 gal.) Fertilize and cull the weaker plants leaving the healthiest one.

    Bookmark   June 23, 2012 at 5:13PM
Thank you for reporting this comment. Undo
jean001a(Portland OR 7b)

They're starving.

Further, way too many in one pot.

Sacrifice the least vigorous by snipping them off so that you can retain the root system of the one plant in good condition.

    Bookmark   June 23, 2012 at 8:42PM
Thank you for reporting this comment. Undo

Thanks to all of you for your suggestions. I am following your suggestions - applying fertiliser, repotting and getting rid of the weak plants. I will let you know if they survive... Hope they would. Thanks to all of you for your time!

    Bookmark   June 30, 2012 at 2:13AM
Thank you for reporting this comment. Undo

Plant 1

    Bookmark   August 21, 2012 at 3:17AM
Thank you for reporting this comment. Undo

Stiull healthy fruits of plant 1.

    Bookmark   August 21, 2012 at 3:18AM
Thank you for reporting this comment. Undo

Finally, plant 2. Sorry for so many posts.

    Bookmark   August 21, 2012 at 3:23AM
Sign Up to comment
More Discussions
Should I grow white tomatoes?
I have Great White seeds and already sprouted some....
fertilizer recipe for tomatoes?
First I found something in the local hardware store...
Sorry, Don't like Sungold
Contrary to popular beliefs I find them much too sweet,...
Please Critique Selections for 2015
My garden each year seems to expand here in N. Indiana...
Why Black Krim Tomatoes grow like that.
Started seedlings of Black Krim Tomato in Asia last...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™