Successful establishment of giant reed within a riparian area results in a decline of the native plant species.

The giant reed along with the salt cedar, have greatly devastated and degraded the lower Colorado River riparian.

Consistent maintenance is needed to eradicate the constantly growing giant reed.

Wetland species such as narrow leaf cattails, horsetail, and giant reed are abundant.

However, exotic plant species, such as giant reed, castor bean, and tobacco tree, are rapidly spreading and have yet to be eradicated.

One of the most troublesome invasive species is the giant reed, which plagues many coastal Southern California waterways.

Perhaps the largest effect that giant reed has is its usage of water.

The saltcedar is another invasive large weed that also, like the giant reed, uses large amounts of water.

In winter-time giant reed stops its growth because of low temperatures and regrowth occurs in the following springtime.

Several reports underlined that it is more economical to grow giant reed under moderate irrigation.