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Different grass growth rates problem

joe.shimminjoe.shimmin Posts: 213
Last autumn I was sowing a new lawn and my wife put me on to ‘speedy seed’. I put it down on the area and then used what remained to over seed various areas of my garden. 
It sprouted quickly. That’s the only positive thing I can say about it. It’s horrible stuff. The grass grows massive. It grows really quickly and it grew really sparsely as well so there are really big patches in the new lawn. It also grows well past the time of year when the rest of the grass has become dormant so I was cutting it all the way into December when the ground was a bog. I had to use a strimmer and then all of the grass sat on the ground on top of the other grass and killed more of it off. Now I’m re seeding my lawn with more normal grass seed over the top. 
where I’ve overseeded, the speedy seed grass grows about three times as fast as the other grass and is always poking above the lawn within a day or two of me mowing. It’s also a nasty light green and looks sickly.
is there anything I can do to get rid of the horrible stuff? 
I rue the day I bought it!!


  • K67K67 Posts: 2,507
    If this speedy grass is so vigorous you will have to get rid of it first,
    Chemical weedkiller or cover the lawn with something, plastic, carpet, cardboard for a few weeks until there is no new growth then rake it over and reseed or lay turf.
    Oh and forgive your wife!

  • joe.shimminjoe.shimmin Posts: 213
    Oh god. Really?!
    I’m not sure I’m going to forgive her. I only had to put then stuff down in the first place because she killed the entire lawn in the summer by applying 10x too much weed and feed. All the grass went black and died and my garden smelled like a swimming pool! 

  • K67K67 Posts: 2,507
    There's the solution let her weed and feed the lawn again!
  • joe.shimminjoe.shimmin Posts: 213
    Just a thought, as this grass grows virtually all year round, could I weed kill it in the late autumn/early winter when the normal grass is dormant and just kill off the speedy seed grass? I think I read somewhere that to work the plant needs to be actively growing.
  • K67K67 Posts: 2,507
    I don't see how you can kill of just the speed seed whatever time of year you apply weedkiller, Systemic weedkiller goes down into the roots so does work better on growing plants but surely will still kill of the top growth of anything you apply it to?
    If we have a mild autumn all your grass will be growing, I have sometimes had to mow a lawn in December. If you use a strimmer don't let the grass sit there as you discovered it needs raking up.
    If doing the whole area is too much rake out the worst areas and reseed now.
    Not familiar with speed seed but if it's a creeping type of grass the above won't work and certainly don't let it grow and flower.
    How about a photo?
  • ObelixxObelixx Posts: 29,849
    Have to agree with  @K67 .  The only way is to kill it all and start again.

    There are 3 things any gardener needs to observe and remember:-

    1.  Patience to do the prep right and then let things grow at their normal pace.
    2.  Always read the instructions at least twice and then follow them when applying fertilisers, weed killers or other treatments.
    3.  Anything that says fast or speedy is going to be a thug and cause problems and not be a quick fix.

    Vendée - 20kms from Atlantic coast.
    "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
  • joe.shimminjoe.shimmin Posts: 213
    Oh well. Thanks for the answers. 
    I’ve put a load of seed down inbetween the speedy seed grass but hasn’t started sprouting you. Do you think it’s worth spraying now and the. It’ll die off just before the new stuff sprouts?
  • joe.shimminjoe.shimmin Posts: 213

    You can see the speedy seed grass in amongst normal grass in these pics. 
    Pic 3 shows fully grown speedy seed grass
  • ObelixxObelixx Posts: 29,849
    Even if you apply weedkiller all over you're going to have to wait a week or two for it to work and then lots of prep work to get the soil cleared and ready for re-sowing with a good lawn grass.   You'll be into May by then and maybe a bit late for optimal grass sowing time.  

    Maybe it would be better to leave it until September to re-sow and, in the meantime, just keep it cut as a normal lawn.  Then towards the end of August you can apply a total weed killer then clear the resulting mess and sow new seed in mid to late September  while the soil is still warm and there's rain to help with germination and new growth.
    Vendée - 20kms from Atlantic coast.
    "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
  • joe.shimminjoe.shimmin Posts: 213
    Ok, I’ll take that route then. Thanks
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