I don't know, Carol. Any shade-cloth should have a number on it that tells you the shade factor. A 50 would be a cloth that filters out 50% of the sunlight. A 70 filters out 70% of the light. If you can't find a number, you might be able to go to the HD home page, pull up "shade cloth" and see if the details are given there under the description of the product. Typically, depending on where one lives, the "stronger" the sunlight during the spring/summer months, the higher the shade factor you want. Thus those in the northern states might only need a 50 whereas those in S. Florida might need a 70. It also depends on what you are growing. My orchids are very sensitive to the infrared rays whereas my vegetable seedlings won't be as sensitive.
