Cold weather can cause purpling, deficiency or not. Don't worry about it.

Epsom Salt is magnesium sulfate, not like table salt, which is sodium chloride.

Cindy

Thanks for the clarification on the Epsom salts. Should I do a foliar application?

Here are some photos of what looks like deficiencies. I think the magnesium deficiency needs to be addressed.

Hopefully, these photos will post as this is my first attempt at posting pictures.

Here is a link that might be useful: Photos

I'm also growing in containers and in the ground. About half of my container tomatoes show similar signs of mg deficiency (least that's what I assume it is, the bottom leaves are exactly like your final photo). Many of my tops are more purple with rolled over leaves and purple veins. So I'd be curious to hear other suggestions.

I've been spraying with epsom salt and liquid worm casing for a couple weeks. It hasn't seemed to help. *shrug* Of course, maybe it'd be worse now without. Next year I'll be adding some Epsom salt to the soil mix. Wish Raybo was still posting. I believe he has an ongoing experiment with this?

Strangely, it does seem to depend on the plant. Anna's Russian, Black Krim, Krijna Oxheart, and Knin have it bad. Stupice, Brandywine, Cherokee Purple, Persimmon, Sungold, and Coustralee have little or no sign. All are in SWCs with identical soil and additives.

Okay, I figured out how to post the photos directly into the message:

Purplish new growth with mottled leaves:

Purple stems

Mag Deficiency

Should I try to correct these by giving them a balanced fertilizer and Epsom salts?

Any thoughts?

I would dissolve a teaspoon of Epsom salt in a gallon and water the plant(s) when they need more water. You may have an over-watering issue due to the yellow in the leaves of the last pic.

I would also spray the foliage with a seaweed/fish emulsion fertilizer.

JMHO.

Cindy

Thanks everyone for the input. I will let the soil dry out a some before adding any more water and then apply the Epsom salts and a Seaweed/Fish emulsion fertilizer. Hope it's not too late for the potted tomatoes as the upper leaves are starting to look like the those in the last picture.