Tomatoes, the taller they grow the more yellow the leaves?

[Palmers-patch]

I’m wondering what I am doing wrong with my tomato plants this year. I grow them in growpots in growbags in the greenhouse. The growbag has a hole in the base and is next to the soil. This has been a successful method the last 3 years but this year the taller they grow the more yellow the leaves become (see photo, the 2nd photo looks down on the growing Alicante plant which started off very healthily) There are 6 plants in the greenhouse, 2 Moneymaker, 1 Shirley, 1 Alicante and 2 Sun Baby. The sun baby’s leaves have practically curled up rather than gone yellow.Last year I did Sun Gold in the same way and they were fantastic. On the other side of the greenhouse there are 2 very healthy cucumber plants grown in the same way. Anyone any ideas as to where I am going wrong?

[veggiechicken]

Are you feeding them?

[WendyC]

I'd agree with VC, they look hungry to me. I'd go for a general liquid feed, with a good amount of nitrogen in, to get them going. When the fruit is setting you can switch to a tomato feed.

[Thelma Sanders]

The purple tinge looks like Phosphorus deficiency what make are the grow bags?

[Potstubsdustbins]

A good high nitrogen feed such as miracle grow plus a spray of Epsom salts should do the trick

[jackarmy]

When my toms are lookin like that i simply play them this

https://www.youtube.com/watch?v=WlBiLNN1NhQ on a loop

[Palmers-patch]

Many thanks everyone, they have had tom feed but I will try the Miracle Grow, then more tom feed, nothing to lose now. I was worried I was over watering but the cucumbers are fine. Grow bags were a make I'd not seen before from a local garden centre, I turned them over because I didn't like the packaging so I'm not sure, will try and look underneath! Will try the epsom salt spray, not done that before...

[Palmers-patch]

And I may even try the Life of Brian song!!!!! Thanks Jackarmy

[jackarmy]

Id highly reccomend it pp

[Python15]

A good high nitrogen feed such as miracle grow plus a spray of Epsom salts should do the trick

I've never used Epsom salts before Pots, is it literally a spray? If so what sort/mix of solution is used.

[Potstubsdustbins]

^^^^^^^^^^ I use 2 table spoons to a gallon of water and apply as a foliar feed using a hand spray.

[Python15]

Many thanks Pots, I will certainly keep this in mind!

[Valleyman]

Epsom salts is brilliant. As a grower of toms in pots I was cursed for years by diseased looking lower leaves and unhealthy looking upper foliage. Food didn't seem to help. I just thought that was the way tomatoes looked.

Turn out magnesium deficiency is a big problem for tomatoes. Now I spray with Epsom salts the leaves are a really dark healthy green. Even the toms grown in the ground look so much better.