Using barriers to prevent pests from reaching plants is one of the simplest, oldest, and most effective ways to prevent damage. Most of the methods for protecting plants with barriers are familiar to organic gardeners. However, there are recent technical improvements in materials that make barriers more effective than ever before.
Floating Row Covers
Floating row covers don’t really float. They are lengths of synthetic fabric that are so light-weight they appear to float when draped over your plants. The covers look like the white interfacing used in clothing and are made of spun-bonded polypropylene or extruded plastic. They let in more than 80% of the sunlight that shines on them, and rain and irrigation water can pass through them.