Water PoppyText Box: WATER POPPY (Hydrocleys nymphoides) Yellow poppy-like flowers. Small, green round leaves that cover the water’s surface. Grow to 6 inches above the water. Water depth 6-12 inches. Weather permitting we ship the tropical marginal and bog plants April through September. OUR MARGINAL AND BOG PLANTS ARE EITHER IN 2 INCH POTS OR BAREROOT Tropical marginal and bog plants will not survive the cold temperatures, if you live in zone 7 and below you might consider them to be annuals or bring them indoors in the winter. .