water cover

Water Snowflake (Nymphoides indicum variegata)

  • Hardiness: Zones 8 – 11
  • Height: 6″
  • Flower: White frilly flowers
  • Foliage: Small circular green or varigated pads float across the surface giving a look of miniature waterlilies
  • Comments:  A great surface marginal plant that spreads quickly

 

Salvina Natens

  • Hardiness: Zones 7-11
  • Height: ½” high on surface of water. Flotation is made possible by pouches of air within the leaves.  
  • Flower:      None
  • Foliage: The stem is floating, filamentous and branched. Sets of 3 leaves form on a stem: 2 small green hairy ones above water and one that serves as the root structure below the water. These small units reproduce rapidly.
  • Comments: Salvina blocks sunlight from reaching very far underwater and removes nutrients, which also prevents Algae from developing. 

Fairy moss (Azolla caroliniana)

  • Hardiness: Zones 5-11
  • Height: Less than 1″
  • Flower: Not showy
  • Foliage: Lacy bright green fronds that turn reddish in full sun, forming multilayer free-floating mats 4 cm thick
  • Comments: Leaves normally not eaten by fish; overwinter indoors; naturalized in shallow ponds, ditches and sluggish streams. The sporophyte of Azolla caroliniana commonly survives throughout the year in temperate areas (with hard frosts and prolonged ice cover). It is the best adapted of all species for subsistence on mud.

Parrot feather (Myriophyllum Brasiliensis)

  • Hardiness: 5-11
  • Height: 6″ – 12″
  • Foliage: Small leaves in whorls; aerial foliage have a deeper blue-green color, red stems
  • Comments: Often used in aquariums as an oxygenator; submerged plant but will root and develop aerial foliage in shallow water;
  • obtains nutrients directly from water; soil planting not necessary
  • The larger variety Myriophyllum Aquaticum can become invasive and is being removed from many suppliers availability list.

Water hyacinth (Eichornia crassipes)

  • Hardiness: Zones 8-11
  • Height: 6″
  • Flower: Pale blue to lavendar flowers with yellow spots on 6″ spikes
  • Foliage: Balloon-like petioles swollen with spongy tissue; rosette of pale green, shiny, rounded leaves
  • Comments: Requires abundant sunlight and warm temperatures; long feathery dangling roots;
  • Varieties: Dwarf Hyacinth – grows to 6″ – 10″ in height; Florida Native Hyacinth – grows to 12″ – 18″ in height in Alberta 
  • Invasive in warmer climates
  • water hyacinth