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My peppers and chillies have really pale leaves.  I've been giving them the Tomorite when I feed the toms.  What are they short of?

Funny you should mention that - no pic at this time of night, but my chillies have the same problem. Only difference is that they are in a grow bag which seems to need less water than the 1/2 bags on end. Otherwise, same regime. = Tim

Could it be a potassium decifiency?

If it is, & you're feeding them high potash, then there's a contributory cause? And mostly, I thought of an N deficiency?? No clue. = Tim

Generally pale leaves are indicative of a Nitrogen deficency. Potassium mostly shows as a marginal chlorosis on the leaves, rather than the whole leaf.
Low N can be the result of a few things. Tomorite does supply some N but it may not be enough in your situation. Nitrogen is washed out of the soil very readily (it is highly water soluble) so if you have been overwatering, or you have had a lot of rain, it may not be available to the plant. Additionally, if it has been too cool for the plant then metabolism of N may have been disrupted. This will also show up as pale leaves.

I can see that could be it they aren't too warm and have been v.damp.  They are getting moved to a warmer/drier spot.  What will give them nitrogen?  I've got Phostrogen.  Thanks

  Someone else will have to advise you about a high N fertiliser in the U.K.. Dried blood is an organic source if you are prepared to use it (it will act more slowly than a synthetic chemical source).
 If you can I would move the plants to somewhere warmer and drier and wait for 10 days to see if they turn darker. Tomorite is formulated to provide enough N during cropping so, if you have been using it, there may be enough in the soil already. Adding N, if there is sufficent already, may create other problems, due to excess salinity. Are they flowering and setting?
 

Can but try - I'm giving mine a foliar feed of 'Baby Bio' -
N10.6:P4.4:K1.7. = Tim

Mine have fruit and flowers.  The chillies are a couple of inches and the largest of the peppers is about 3". They are going to the conservatory which can be toasty! On second thoughts, I think I'll put half in my little flappy plastic greenhouse just to 'hedge my bets'.  Thanks for the help.

I have read that peppers enjoy a foliar feed with epsom salts - I believe it's because of the magnesium.

I couldn't find Epsom salts in my local chemist, so I bought generic magnesium sulphate and they didn't seem to mind. The chemist thought I was mad though  :o

They shouldn't need it. = Tim

Have you checked the pH of your pepper soil Tim? The pale upper leaves could be iron deficency.

Just did - the meter says 7.5-8. But so it does on our tap water, which is normally 6.5!!
Remember we're in bags. = Tim