I just purchased a package of plant bulbs from walmart. The package says they are hybrid aponogeton bulbs. It says they are easy to grow and only need to be dropped into the tank. It says they will be 6'' to 8'' tall in 15 days and in three to four weeks they should have white and pink flowers. I have never bought aquarium plant bulbs before. Have any of you bought these bulbs from walmart? What has your experience been like with them?