Neodypsis decaryi - Triangle Palm A hardy palm with strong upright grey-green leaves reaching 3-5m long. Distinctive three sided triangle shaped trunk. Generally grown as an outdoor specimen in warmer climates, where they require humidity, adequate moisture and a well drained position. Used widely for landscaping around pools, buildings, patio feature plants, parks and gardens. Keep leaves free from dust. feed with a slow release fertiliser as required. Adequate warmth, filtered light and humidity also required.