Here are some basic guidelines for the number of plants to use in common sizes of ponds. In a 4'x6' pond use 1 lily, 5-8 bog plants, 3 floaters, 24 submerged plants. A 6'x11' to 11'x11' pond use 2 lilies, 9-13 bog plants, 6 floaters, 44 submerged plants. For 11'x11' to 14'x16' ponds use 3 lilies, 10-15 bogs, 8 floaters, 90 submerged plants. A 16'x10' to 16'x21' pond uses 5 lilies, 13-18 bog plants, 12 floaters, 160 submerged plants. 21'x21' to 26'x 26' 7 lilies, 20-28 bog plants, 15 floaters, 200 submerged plants. For more tips on plant care please visit Richdeer3 Pond Supplies