Is that the Okinawan or Molokai potato? One year I had a Molokai sweet potato in a 15-gallon wicking container, and it did not form any potatoes after 6 months. This year I Kept up with fertilizing every month and I see potatoes forming near the top.
Copilot: If your goal is to grow large, high-quality sweet potatoes, consider using a fertilizer with an N-P-K ratio closer to 5-10-10 or 8-24-24. The higher potassium (K) helps promote bigger, healthier tubers. Also, supplementing with bone meal or wood ash can provide extra phosphorus and potassium while keeping nitrogen levels in check.