Nepenthes ventricosa & 'Deroose Alata' Not Pitchering: Humidity, Light, and Fertilizer

Grower's N. ventricosa and 'Deroose Alata' produce leaves but pitcher buds blacken. Neighbors (N. copelandii, N. × miranda, N. alata) pitcher well. Conditions: SW window, 4 hrs direct sun, watered 2×/week.

For N. ventricosa

• Increase humidity: pebble tray, slightly wetter soil.
• Light fertilizing: 1 tsp/gal orchid or seaweed fertilizer, foliar, every 2 weeks. Stop if already fertilizing heavily—excess = leaves only, no pitchers.

For 'Deroose Alata'

• Likely light deficiency. Despite 4 hrs sun, may need longer days or brighter intensity. Wait for spring/summer.

General

Send photos for finer diagnosis. Seasonal day-length increase often triggers pitchering automatically.