Nitrogen deficiency
What it looks like: Older leaves yellow first, plant growth slows, stems may look thin, and the whole plant can look pale.
Organic cure list:
- Top-dress with finished compost.
- Add worm castings around the root zone.
- Use diluted fish emulsion or alfalfa meal during active growth.
- Improve soil biology with mulch outdoors.
Prevention note: Feed lightly but consistently during active growth and avoid waterlogged soil.