Although their season is coming to an end, and there will be little growth, weeds survive by setting seed.

These plants were taken out and grown on so they could set seed.

If you don't, the plants will set seed and give up the ghost.

Next year's class will carry on the project, learning to identify the plants, and watching the flowers set seed.

These plants flower, set seed and are killed by the first cold snap.

They rush to form their simple flowers, set seed and then disappear.

These shoots are able to grow, flower and set seed two to three years after a fire.

Plants begin to wind down and start to set seed.

According to reports, it flowers in the summer but doesn't set seed.

Most of the plants die off in the dry summer after setting seed.