Does Calamagrostis Self Seed?

Requires little maintenance. Cut clumps to the ground in late winter just before new growth appears. This grass will not self-seed in the garden because seeds are sterile.

Does Karl Foerster grass spread?

Uses for Karl Foerster Grass Plants

In a mass planting with accent perennial flowers, the effect is quite surreal and dreamy. As a stand-alone specimen, the grass adds vertical appeal. ... The plant spreads by rhizomes and can become wider over time, but it is not considered invasive and will not self-seed.

Does feather reed grass spread?

While feather reed grass won't spread uncontrollably in the landscape, a clump of it will continue to get larger.