Stipa 'Pony tails ' tennuisima

Wrong spelling I know but Im a gardening dyslexic. I wanted a long swaying mass of grass and find these have not grown as largeor wide as I would like. Should I buy more or plant seed or is there a similar grass that would grow wider?

 

Jean

How old are your stipa plants? Maybe they're still a bit young. They do take a few years to spread unless there's something about their location which is holding them back. Have they got plenty of sun and good drainage?

If you really, really want a grass that spreads whatever the conditions are like, you could always try phalaris arundinacea. But be warned -it's invasive+++ and you need explosives and a good flamethrower to keep it under control!