White Specks on Sweet Potato Vine: Salt Buildup, Not Pests

Tiny white granules on indoor sweet potato vine leaves that scrape off and leave black spots are likely salt deposits from over-fertilization or root stress—not insects.

Why It Happens

• Excess fertilizer salts accumulate in leaf tissue, exude through pores (hydathodes).
• Root rot or poor drainage prevents proper water uptake, concentrating salts.
• Hard water contributes mineral deposits.

Fix

1. Stop fertilizing for 4-6 weeks.
2. Flush soil: Water thoroughly until water runs free from drainage holes (repeat 3x).
3. Ensure pot drains well; empty saucer.
4. Use distilled/rain water if tap water is hard.

New growth should be clean. If black spots spread, check roots for rot.