Reputed to be the fastest-growing plant in the world! Can double in size
in a week during hot weather. Forms dense mats that impede water flow. Seeds can live 15-20 years. The State of California has spent
$45 million over 15 years to control water hyacinth in the Sacramento-San Joaquin Delta.
Invades streambanks and wetlands throughout the U.S. Persists year to year from root buds and from the root crown. Although not commonly sold in California, this plant is available for purchase on the internet. One plant can produce 2.7 million seeds. Has the potential to infest rice fields.
Ludwigia hexapetala, L. uruguayensis, L. peploides
Crowds out native plants and reduces water quality. Dense mats slow water movement and create habitat for mosquito larva, which can carry West Nile virus. Although there are native Ludwigia, do not collect them from the wild.
Illegal to sell in the US. Floating mats up to 3 ft. thick reduce
light and dissolved oxygen in the water so that few living things can survive. Common salvinia (Salvinia minima) may be sold, but species are difficult to tell apart.
The most widespread submerged invasive aquatic plant in California and a
serious problem in Lake Tahoe. Stems are brittle and break easily, starting new infestations when spread by boats or water birds.
'Alphonso-Karr' bamboo, 'Golden Goddess' bamboo or clumping bamboos
Bambusa multiplex 'Alphonso-Karr', Bambusa multiplex 'Golden Goddess' or Bambusa multiplex
Pond Margin or Bog. Useful as a hedge or screen. Rhizomes of clumping species stay close to the plant and will not invade surrounding soil. Height varies by cultivar, up to 35 feet. Do not plant running bamboos, which spread aggressively.
Submerged Plants. One of the best oxygenating plants. Has dark green leaves and provides food and shelter for fish. Dies back in winter. Grows best in fine sand but may need to be controlled in small ponds. (Sometimes also sold under the name anacharis.)
Sagittaria latifolia, Sagittaria montevidensis or Sagittaria lancifolia
Pond Margin or Bog . Striking arrow-shaped leaves and white flowers. Grows in moist soil or water 6 inches or more deep. S. latifolia grows 12 to 20 inches; S. montevidensis to 4 feet. Also try S. lancifolia (white swan or red swan) for a specimen plant with green or red stems and a 7-foot flower spike.
Pond Margin or Bog. Herbaceous perennial with flowers heads arranged in whorls of white, pink, or lavender. Blooms form a pyramid-like shape. Suitable for medium to large ponds, but may overwhelm a small one. 12 to 36 inches tall and up to 18 inches spread.
Pond Margin or Bog. A true water-loving iris that will do well in 6 inches of water. Flowers in white, purple, lavender, and pink. Yellow-blooming varieties are available, but rare. Leaves to 18 inches tall.
Floating or Rooted Emergent Plants. Tiny, free-floating perennial fern. Excellent pond cover for fish and other wildlife. Turns reddish-purple in the fall. To 1/2 inch high, with a spreading habit. May overwhelm a small pond.
Floating or Rooted Emergent Plants. A native plant with a dramatic yellow flower and round leaves up to a foot in diameter. Foliage is submerged in winter and emerges in spring. May take more effort to find for sale.
Lobelia cardinalis, Lobelia fulgens or Lobelia siphilica
Pond Margin Plants. A spectacular blooming bog plant. Tubular flowers resemble honeysuckle or salvia and attract hummingbirds. L. cardinalis and L. fulgens to 6 feet with red flowers; L. siphilica grows 2 to 3 feet with blue flowers.
Pond Margin or Bog. Annual or perennial. Fills out a 4 feet x 4 feet space in spring and summer. May die back then return the next year. Yellow flowers with reddish spots resemble snapdragons. Hummingbirds like it; deer don't. Also try M. cardinalis for red flowers.