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HELP - unknown weed in new lawn


 
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km79
Rank attained: Hazel Tree
Rank attained: Hazel Tree


Joined: 18 Oct 2009
Posts: 14

PostPosted: Sat May 15, 2010 1:08 pm    Post subject: HELP - unknown weed in new lawn Reply with quote

long story short back lawn resown about a month ago. it has come up fairly patchy prob due to dry weather. in last week a lot of one type of weed have popped up in some bare areas. i would like help identifying it and suggestions on what to do TIA
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James Kilkelly
Rank: Site Admin


Joined: 30 May 2006
Posts: 2142
Location: West of Ireland

PostPosted: Sat May 15, 2010 1:59 pm    Post subject: Reply with quote

Looks like Brassica napus commonly called Rape or field mustard km79.
Either that or Brassica nigra commonly called Praiseach or Black Mustard

A selective weedkiller can be used to remove this weed on established lawns.
But on a new lawn this can pose problems.
You see new lawns are softer, not battle hardened and liable to scorching by selective weed killers.
My rule is....... selective weedkillers are perfectly safe to use on new lawn 7 months after sowing.
The absolute earliest I would allow the spraying of a selective weedkiller on a new lawn is after 3 months.

My suggestion to you....... Hand weed as much as you can.
The rest will cut out of it with regular mowing.

This is the type of flower you will see if left to grow.......



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michael brenock
Rank attained: Chlorophyll for blood


Joined: 12 Aug 2008
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Location: cork

PostPosted: Sat May 15, 2010 8:17 pm    Post subject: Reply with quote

This is only an annual weed and will be killed off by the first run of the lawnmower. This weed Corn kale is common in soils left undisturbed for a long time or in sub-soils.
Set the lawnmower about 2 inches high when the grass is established in a few weeks time. don't bother using a weedkiller.
michael brenock horticultural advisor (retired)
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