Water Sprite

Ceratopteris (water sprite)
Up to 20" tall. Exists as rooted or floating specimens. Good fry shelter, shade plant. Baby plants grow on older leaves. Confused with Hygrophila difformis sometimes. Several different species and/or forms, which may require more light than others.

Green Hygro

Hygrophila polysperma (green hygro, Indian hygro)
Spreads like a weed. Green under medium light, but gets brownish tinge (and grows larger) in high light. Sunset and variegated varieties are available, but harder to grow.

Valisneria

Valisneria
Grass. Reproduction by runners. Some find it grows wildly, then mostly dies off, in a cycle. Wide temperatures 59-86F. V. spiralis (Italian val) has ribbon-like leaves up to 20" and throws up a spiral stalk when flowering. V. tortifolia grows corkscrew leaves, hence its name Corkscrew val. Other common species: V. gigantica (Jungle Val).

Cabomba

Cabomba (fanwort)
Stems up to 20" (50cm) tall. Leaves resemble fine pine needles, fanning out from central stem. Pair of leaves at each node. Will tend to break apart and litter the aquarium if light is too low. Difficult to grow; needs high fertilization.

Floating fern

Azolla (floating fern)
Floating fern that grows out in triangular rafts. Buy at water garden stores.

Water lettuce

Pistia stratiotes (water lettuce)
Very demanding plant that prefers full sun (where it will grow the size of actual lettuce) over aquarium conditions (where it might be the size of a quarter). Reproduces by runners. Buy at water garden supply stores.

Orchid Lily

Barclaya longifolia (orchid lily)
10-20" delicate brownish or olive-green leaves, moderately-undulated margins. Likes warmed substrate and warm aquariums (75-82F). Foreground single plant. Often rots on transplant. Flowers and seeds easily by sending a stalk to the surface, or will remain submerged and closed (seeds still viable). Very difficult to grow.

hard to kill plants

Many hobbyist think that aquatic plants are impossible to keep or grow. Wwell think again. The hardiest plants are here available to most hobbyist . The "Java Fern" and the "Anubias " plants are the easiest and hardiest of all aquatic plants. These two species require minimum lighthing and care.
Both grow and propagte at a minimal good growth.The java fern propagates by rhizome and its leaves shoots baby plants. As for the anubias the come in several varities. the "nana" and "barteri" variety are so far the most popular. The other advantage you will have with these aquatic plants is you literally can put or house them with even tropical fish that just cannot resist to nibble on plants. so all in all recommended for begginers and all who love aquatic plants.

Water milfoil

Myriophyllum (water milfoil)
Temperate water plant that needs good lighting. Good for background. Fine, green to reddish green leaves, depending on the species. Produces coarser leaves above water, which will flower.

Cardimine lyrata

Cardimine lyrata
Beautiful, delicate plant. Small (1/2 - 1") heart-shaped leaves with wavy edges on a thin stem. Grows roots above water at each node. Tolerates cold water very well; will overwinter outdoors at temperatures around freezing, even when emersed. Leaves look kind of like Hydrocotoyle sp., but stem is straight

Bacopa

Bacopa (water hyssop)
A bog plant that grows OK underwater, background or filler plant. Pale green-to-red fleshy leaves, up to 16" tall stem. 68-78F. Makes good background or side plant, in groups.

Plants and pots

Many aquatic plants are now sold in potted rockwool. Plants with delicate roots, such as Cryptocoryne and Anubias, are usually best left in the rockwool wadding, especially if you have to move them around in the tank. Leaving them potted also can reduce transplant shock; otherwise you must be patient and allow the plants time to recover in their new substrate. You can bury the pots in your gravel to conceal them. Some folks like to cut away the plastic pot, and just leave the plant in the wadding so it can grow out into the substrate.

Amazon Swords

Echinodorus (Amazon swords)
Most are good as single highlight plant, or background groups in large aquariums. Like high levels of fertilizer. Can grow emersed. Reproduce by adventitious plants on end of stalks runners, or root division, depending on species.
Common species:
1. bleheri, paniculatus, amazonicus: Your generic amazon swords, usually available in small, medium or large. Light green leaves can be over 20" (50cm). Produces plantlets directly on the flower stalk.
2. cordifolius (radican sword): heart-shaped leaves. Likes being emersed; will flower in open-top aquarium. Sends floating leaves if illumination is low.
3. major/maior (ruffle sword)
4. osiris (melon sword): blood-red slightly-undulate leaves.
5. parviflorus (tropico sword): smaller variety.
6. tenellus, quadricostatus (pygmy chain sword): leaves up to 6", 72-86F. Fast reproduction by runners; can create a lawn on large enough tank. Small plants; nice foreground display.

Temple Plant

Hygrophila corymbosa (giant hygro, temple plant)
Also known as Nomaphila stricta. Light green leaves, sometimes with reddish veins. Easily grows out of the water, where leaves turn dark reddish green. Big plant; makes good corner/background in large deep tanks. Grows quickly given high fertilization. Fairly hardy. Another species with similar appearance and requirements is narrow-leaved hygro (probably H. augustifolia).

Crystalwort

Riccia fluitans (floating liverwort, crystalwort)
Big tangly glop like Java moss; good livebearer fry cover. Grows fast under high light.

Arrowhead

Sagittaria (sag, arrowhead)
Straight-bladed green grass. Many different varieties, some small foreground plants, some rather big. Hardy. Propagates by runner. S. subulata grows 4-24" leaves and throws up small white flowers in shallow water. 63-82F.

Rotala

Rotala
Very delicate leaves, easily damaged. Grows up to 20" tall, so they make excellent background plants. R. indica can grow in medium light, but just will not stay as green. R. macrandra is largest, and hardest to cultivate. It has red leaves with pink undersides, turning to green in lower light, and requires iron fertilization to maintain its red color

Duckweed

Lemna (duckweed, green plague)
Tiny (1/4") plant with a pair of leaves and a root. Reproduces very quickly. A very noxious weed, hard to eradicate, and most fish don´t like to eat it. Try a floating fern such as Salvinia instead of this one.

Java Fern

Microsorum pteropus (Java fern)
This is one of the more hardy aquarium plants. It roots itself to solid objects like bogwood and rocks (attach with a piece of string or rubber band to hold it in place at first) and has a creeping rhizome which may be divided for cuttings. Young plants will also develop directly off spores, attached to old leaves, and can be cut off and rooted. In high light, it produces tough, plastic-like leaves; under low light the leaves are more delicate. Fronds are up to 8" long and undivided, though on older plants are trilobade (three lobes to a frond).