Please look at these tomato leaves

[muck lover]

The leaves on my tomato seedlings are lime green instead of dark green and there’s yellowing on the older leaves between veins. I looked it up and think it’s magnesium deficiency.
I wasn’t sure if this occurred on very young plants though. They aren’t very old and are in a mpc with added nutrients.
Should I treat with Epsom salts or a general fertilizer?
They are Roma tomatoes.

[nickdub]

The weather has been v cold for the time of year - some of my plants, which are in an unheated poly-tunnel, look much like yours and in their case its down to the low night time temperatures having caused a bit of damage to the leaves.

[muck lover]

Maybe.....they are on a windowsill but I suppose they could have got chilled at night....
I’ll move them away from window if there’s frost forecast.

[muck lover]

Mind you they are still looking better than tomato and courgette plants I saw in b and q and last week in home base. Which were dead. Shrivelled and clearly dead. Must have got frosted. The hardy plants they had for sale like strawberries broad beans etc were all ok. The tender ones in both shops had snuffed it.

[Jungle Jane]

Careful you don’t get the leaves wet,the sun burns & causes pale patches that look like that.

[Penellype]

I know the feeling - these are my tomato seedlings:



The ones at the back are balconi, which have always been dark green. The ones at the front are Shirley which have been pale and yellowish for some time. I am going to pot the Shirley up soon even though I usually wait until the roots are showing at the bottoms of the pots and theirs are not.

What confuses me is that the plants are in compost from the same bag and have been kept under the same grow lights in a centrally heated room. I have 2 bigger Shirley plants downstairs which are a normal green colour, seeds were from the same packet.

[nickdub]

Must say your Toms do look a bit more like they have classical deficiency symptoms - no idea why - could the size of the pots have any bearing, or the feeding you do ?

[veggiechicken]

My early sown tomatoes have the same discoloured leaves. They've been consigned to the GH for the last week as I've almost given up on them. Never had this problem before.
Its reassuring that I'm not the only one. Very odd!

[Penellype]

My Shirleys were sown on 7th March in compost from a tomato grow bag (boasts feeds for 6 weeks). By my calculations we are only just about at 6 weeks now, assuming that the compost was being depleted of nutrients as soon as the seeds were sown. It really is odd.

[It never rains..it pours]

Need feeding (nitrogen or epsom salts deficiency) or over watering

I planted a couple of mine in 9cm pots using tomorite compost, they went yellow where as others in verve john innes didnt however they re greeened when feed them miracle grow + epsom salts

[Scoot]

My tomato plants are the same too. A lime green colour. Theyre still growing but just a light colour.

No idea why.

[lottie dolly]

I have broad beans the same,same seed,compost,same place to grow,yet still a hek of a difference from some planted earlier,the only thing different is,they were sown several weeks between,the idea to get a staggered growing,what a strange year this is so far.

[jackarmy]

Some of mine are like that although the majority ( all up th gh for a week now ) are fine, the ones that are suffering are the ones that are dripping wet, too much water ?

[nickdub]

Dripping wet certainly means too much water - best aim a little on the dry side, when the weather is cold - whether the excess water is linked to the look of the plants is another thing - no way to be sure.

[veggiechicken]

Some of mine are like that although the majority ( all up th gh for a week now ) are fine, the ones that are suffering are the ones that are dripping wet, too much water ?

Jack, are the leaves wet, or the compost? I "think" some of the problems with mine may be condensation dripping from the GH roof onto the leaves. They've been moved to a dried spot now.