Underdeveloped pitchers on a Nepenthes ventricosa in a cool, cloudy spring are normal. The plant is simply waiting for warmer, brighter conditions to complete pitcher formation.
Keep all underdeveloped pitchers—they will open and color up once consistent sun arrives. In Oregon, summer often doesn't truly begin until after July 4th.
With proper light and warmth, the plant will produce numerous well-colored pitchers. No intervention needed beyond standard care.
Good growing!
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