Purchase molded coco liners for 16" diam. x 10" deep flower baskets.  Our replacement coco liners are thickly molded with natural latex and normally last at least two years depending on weather conditions, amount of water, etc.  The premolded liners are ready to fit right into your wrought iron flower baskets.
 
Coco coir is the fiber resulting from the processing of coconuts (the removing of the "nut" from its fibrous encasing). The coir fiber is a by-product making it quite renewable.  Disposal is easy and environmentally sound.