Allotment Gardening Advice Help Chat

Growing => Growing in Greenhouses & Polytunnels => Topic started by: the Kergan on July 31, 2012, 17:46

Title: Tomato plant leaves
Post by: the Kergan on July 31, 2012, 17:46

Noticed in the last day or two that my tomato plant leaves are turning a dark purple colour along the edges of the leaves and they seem to have lighter and darker green tones to the leaves.

I did cut the foliage back on them quite harshly at the weekend to let more light in to start ripening the fruits on them. This is happening on all 8 plants in the greenhouse.

Could it be stress from taking off to many leaves and branches or perhaps the quite sudden drop in temperature in the last couple of days. Or perhaps some type of virus

Title: Re: Tomato plant leaves
Post by: Yorkie on July 31, 2012, 18:00

Leaves can turn a bluey colour if they get too cold, and there have been some chilly nights here recently.  Not sure whether it's the same in your part of the country - do you have a max and min thermometer in your greenhouse?

Unlikely to be a virus but you shouldn't remove too many leaves as it stops the plant producing energy.

Title: Re: Tomato plant leaves
Post by: the Kergan on July 31, 2012, 18:28

Yep the max and min thermometer showed it was down to 11 last night

Title: Re: Tomato plant leaves
Post by: mumofstig on July 31, 2012, 18:56

It may be Potassium deficiency

See the RHS advice
http://apps.rhs.org.uk/advicesearch/profile.aspx?pid=456

Title: Re: Tomato plant leaves
Post by: the Kergan on July 31, 2012, 19:33

I fed them tonight with tomato rite as I do every week. I might sprinkle some blood fish and bone around the top of the pots and water it in tomorrow.