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I have several varieties in pots.  When should I trim them and by how much?

Many have been in the same compost for years.  Should I repot and when?

Hello gold croft

Nice to meet a fellow grass grower.

Depends on which grasses you have but don't do it yet.

So, what do you have, what size pots are they already in amd how long have they been there?  Have you divided any yet? Most grasses benefit from division.


I prune my ornamental grasse pretty hard in December and January.  I cut them back hard to approximately 10 cm above ground level. In my experience it promotes strong new growth. Now is a good time to lift up, if you can and divide established grass plants. They are forgiving and generally easy to grow. Good luck! 



Have to say that I am with Verdun on this one. First of all you you need to know whether they are evergreen or deciduous grasses. With evergreen types such as Festuca, Ijust comb out the dead leaves in March / April. Deciduous types do need cutting back but Winter is probably not the best time. I would leave it till March time.

If they have been in pots a long time then they probably do need re-potting. Again I would wait till March to do this

So goldcroft, we need to know which varieties you have.

Some grasses can be killed by winter pruning......even down here where it's mild.  Ditto with division at this time of year.....grasses simply do not make new roots in cold soils so sulk and can rot.  Nothing to lose by delaying for few weeks but everything to gain my opinion 


Thanks to all. Apart from Tina, all seem agreed.  Wait a few months.

Few weeks only.  Late march is fine.  

You didn't say what types you have.  Do you  know?  

To be honest I cannot remember varieties Verdun!  Sorry.  All keep their growth and leaves all winter and the pots are on gravel.  I have one miniature bamboo, one grass stays brown and another is Elija (?) blue, others have trailing variegrated leaves.  I apologise for my lack of knowledge.


Elijah blue is a blue festuca.  I divide mine in spring.  Dig them up and pull apart and pot up in good compost.  This keeps their foliage looking good and rejuvenated the plant.  And you will have more plamts in early summer to plant out.  Or simply gently combyour fingers through the plant to remove dead stuff. 

The brown one sounds like a sedge ....I cut mine back in spring almost to the ground.  It grows quickly.  Again, you can pull this plant apart and pot up but in this case I usually pull apart in half and replant in the ground. 

Thanks everyone, especially Verdun.  Doubt that my brown one is a sedge as it trails?

Jim Macd

It probably is, it's got more species in its genus than an other grass I can think off. Some very nice ones though.

Buchanii is upright but could be comans Bronze.  This is great for a container where it does kind of cascade

Mike, sedges are not grasses, you are correct.  However, in this context....and in a general discussion of grasses.....sedges are offen included in the mix.  We were  simply trying to establish which carex Dove had already mentioned....was the likely variety.  

Many of us here...prob most of know our grasses from our sedges 

Jim Macd

And some people think anything with thin, strappy  leaves is a grass, such as Phormiums, but you can't control what people think.



..would anyone like to guess what this one is please?  I think I know but would like confirmation.... it seeded in my garden and I've grown it flowered last autumn... remains of which you might be able to see...



I know it well, half a day might bring back the name


I think that's Uncinia rubra.

Salino're usually a lot quicker than that..... you're slacking....

oops... you got in first.....  yes...that's what I thought.... thanks... you're forgiven...


Thank you Salino. I don't like it in the doghouse.