Oncidium Classic Custom Blended Mix by Orchid Supply Store is hand made when your order is placed. Made from the finest ingredients available & are perfect for the plants in your collection. Starting with New Zealand Medium Bark, this mix contains TruFace, Extrusive Volcanic Pumice, Akadama & New Zealand Sphagnum Moss. Orchid Supply Store Custom Blend Mix. Orchid Supply Store Custom Blend Oncidium Classic Mix