Tropical Water Lily: 'Panama Pacific,' ocean blue along with some purple too, is well suited for ponds of all sizes. Fragrant, dark violet-blue flowers appear from July through September. Lasting 3-4 days, blooms open during the day but close at night. Lily pads have heavy purple freckling and crinkled leaf edges. Plant roots in containers filled with heavy soil; submerge so the water level is 6-18 inches deep over the container.