So, my third year plants are having some troubles. Very yellow on the tabasco and the goat's weed with darker veins. My guess is either Magnesium or Iron or both. Since epsom salt is so cheap, I decided to try that first. Here are the plants today 4/10. Sprayed with dilute mixture of epsom salt ~1 tsp in a quart of water (=1.2 Tbsp / gal).