[Yorkie]

I'm not familiar with the product (nor am I that familiar with fertilisers!!), but can you look at its label for where it gives the ratio of N:P:K, something like 2.3 - 7 - 23, or 7 - 7 - 7, or 0 - 15 - 8 (you get the gist, it's three numbers in a row).

[Sam Dodd]

I'm not familiar with the product (nor am I that familiar with fertilisers!!), but can you look at its label for where it gives the ratio of N:P:K, something like 2.3 - 7 - 23, or 7 - 7 - 7, or 0 - 15 - 8 (you get the gist, it's three numbers in a row).

Oh it's pure phosphorus - no N or K at all! I just hung the silver blanket, fingers crossed...

[Sam Dodd]

I'm not familiar with the product (nor am I that familiar with fertilisers!!), but can you look at its label for where it gives the ratio of N:P:K, something like 2.3 - 7 - 23, or 7 - 7 - 7, or 0 - 15 - 8 (you get the gist, it's three numbers in a row).

Well you'll never believe this but I just found a truss on each of five plants! Right near the top - none on the thick main stem yet - BUT THERE ARE TRUSSES! On five out of the nine plants! Pic attached

[Yorkie]

Wahey! 

I'd probably avoid the phosphorus for now - it's mainly aimed at roots rather than leaves or flowers/fruits.

Once the first truss has set, i.e. you have little green tomatoes forming, you can switch to tomato (highest nunber is K) fertiliser.

[Sam Dodd]

Wahey! 

I'd probably avoid the phosphorus for now - it's mainly aimed at roots rather than leaves or flowers/fruits.

Once the first truss has set, i.e. you have little green tomatoes forming, you can switch to tomato (highest nunber is K) fertiliser.

Oh dear I thought 'set' meant formed, as in 'has appeared' so I fertilised with tomato feed today as per pack instructions. *. Well I hope that doesn't mess things up but will cross my fingers. The foil is very noisy in the wind hah but maybe that'll help too.

Thanks SO MUCH for all your help and encouragement, plus everyone else on here who has been lovely too, watch this space! Will post pics of various stages in time...

[Yorkie]

Don't worry too much about it! The tomatoes will survive 

[Subversive_plot]

Looking at the photos, the masonry wall is blocking some light.  As soon as those plants grow taller, and increase sun on the leaves, they will develop the trusses you are waiting for.  You may be able to speed that up if you can elevate the pots they are growing in.

Otherwise, your plants look fantastic.

[Sam Dodd]

Looking at the photos, the masonry wall is blocking some light.  As soon as those plants grow taller, and increase sun on the leaves, they will develop the trusses you are waiting for.  You may be able to speed that up if you can elevate the pots they are growing in.

Otherwise, your plants look fantastic.

Thanks so much for the lovely compliment. Yes that wall is a pain in the backside. The thing with elevating tho is that there's the ceiling above so whatever ends up nearer the top will also be cut off - haha can't win! But I'll try it. Thanks so much

[Sam Dodd]

Update: all plants got trusses! The flowers were setting well, and one plant started producing tiny green toms, so I was over the moon. However, then freezing winds and lack of sun hit, after a particularly hot spell, so unfortunately several plants have dropped blossoms without setting toms, which I'm devastated about. BUT, one plant is still doing well. So it's not the end of the world 

[Fairy Plotmother]

I suspect patience will reap rewards.

I agree! I know! Patience with growing veg or flowers is not one of my virtues. I haven't any trusses on my gardeners delight either and they are in full sun! I have learned (the hard way) that too much fiddling, care and attention is bad for the garden. the foil curtain is a good idea.... and give them another week or 10 days and I'm sure they'll produce. Good luck

[Sam Dodd]

Current status 

[Yorkie]

It may take a while for them to ripen, but be patient.

[Sam Dodd]

Update! Very happy with development. Hope everyone else's crops are going well!

[Jomodu]

May be an old wives tale but I was always told NOT to take ogg side shoots of Gardener’s Delight tom plants - just to let them grow. I know Monty Don has said this as well. No expert but could this be a reason?

[mumofstig]

Here in this article Monty confirms that GDelight is a cordon

'Gardener's Delight' and 'Shirley' are cordons

and earlier in the text says that cordons

…. need supporting from almost the first and it is normal to remove all sideshoots ...

  https://www.theguardian.com/lifeandstyle/2001/sep/09/gardens