Water-garden plants designed for bogs or ponds can really add a nice touch to the different textures of a water garden. While there are many bog-garden plants that are foliage only, there are some that will flower. Possible water-garden flowering plants include the water hyacinth, American lotus, soft rush and pickerelweed.
Water hyacinth, or Eichhornia crassipes, is from the Pontederiaceae, or pickerel weed family of plants. It is a floating aquatic plant with spoon-shaped leaves and purple roots that hang. There are 6-inch purple/blue or lavender flowers, numbering five to 20, from a center rosette. Water hyacinth needs full sun and propagates via offshoots. It is considered invasive and a pest to control.
American lotus, or Nelumbo lutea, is from the Nelumbonaceae, or lotus family. It is an aquatic perennial with floating leaves in bluish green. Pale yellow flowers on stalks can be seen about 10 inches across with a shower head looking seedhead. American lotus requires full sun and will propagate via seeds or dividing the rhizomes.
Soft rush, or Juncus effuses, is from the Juncaeceae, or common rush family. It is a perennial aquatic grass with soft cylindrical stems and flowers are in compact clusters on a stem. Soft rush needs full sun or partial shade to grow and may turn brown or die off (to resprout in spring) in cold climates. Propagate via spring season division of roots.
Pickerelweed, or Pontederia cordata, is from the Pontederiaceae, or pickerel weed family. It has 4- to 8-inch spongy leaves with 6- to 8-inch violet blue flowers on 2- to 3-foot stalks. Pontederia cordata needs full sun or filtered sun and can be propagated via dividing the rootstock.