The plant sets no viable seed, so it can't become invasive that way.

Plants provide viable seed, and second generation hybrids have been raised.

In one study, an estimated 17,100 viable seeds were released following an experimental fire.

One or two viable seeds are produced per cluster of pods.

He now has trees 35 to 45 feet tall and hopes to have viable seeds within 10 years.

In many cases, viable seed lies dormant for years before it grows.

They may also be a repository of viable seeds for rare species.

Groups concerned with control of the food supply had expressed concern that the technology would be used to limit access to viable seeds.

One plant can produce over 500 pods, however, many of them contain no viable seeds.

The plant is fertile, producing white flowers and viable seeds.