I'm a little confused. When one clicks on the garden size (see screen grab below), there seems to be a huge gap between Large Garden - 100-1000 square feet, and Medium Yard - 1/2 acre or less. An acre is 43,560 square feet, and 1/2 acre then would be 21,780 square feet. It looks like anything greater than 100 square feet but less than 21,779 square feet is without a category. Can you elaborate?