Nutrient
Iron or manganese deficiency
Iron and manganese deficiency show up as yellowing between the leaf veins while the veins themselves stay green, usually on new growth first. High soil pH is the most common reason the plant can't take up iron or manganese that's already present in the soil.
How to confirm it
- Check whether yellowing appears between the veins while the veins stay green.
- Note whether it shows up on new growth first, unlike nitrogen deficiency which affects older leaves first.
- Test soil pH, since alkaline soil is the most common reason these micronutrients become unavailable to roots.
Next Steps
Fixes connected to this cause
Test garden soil
A soil test helps separate nutrient guesses from actual nutrient problems.