Silk Pittosporum Bushes. Silk Pittosporum Plants. Silk pittosporum plants are not made from real silk. Silk pittosporum plants are made from synthetic fabrics, plastic coated iron wire. Silk bushes silk plants come un-shaped. Size is from the bottom stem to the top of the tip leaf. Products: Due to each monitor screen / tablet difference / mobile phone, the item's colors might be slightly different from the picture shown.