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Roundup & Dandelions - Do the flowers still produce viable seeds which need to be disposed of after

PeterJarvisPeterJarvis Posts: 123
in Problem solving
Do the flowers still produce viable seeds which need to be disposed of after spraying with Roundup?
When you spray Roundup on a Dandelion, because it's slow to act and see results, the plant produces often flowers before it dies.

Posts

  • AnniDAnniD Posts: 12,585
    I usually cut the flowwers/seed heads off first and apply it to the "rosette" of leaves.
  • Pete.8Pete.8 Posts: 11,340
    edited April 2022
    I suspect the seeds are still viable.
    I recently went round spot-treating mature dandelions with glyphosate.
    It seems to take a good 2 weeks for the plant to die, but the flowers are easy to spot, so I just pull them off before the seeds appear.

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • punkdocpunkdoc Posts: 15,039
    I think the seeds would probably survive Agent Orange, so best to dispose of them.
    How can you lie there and think of England
    When you don't even know who's in the team

    S.Yorkshire/Derbyshire border
  • FairygirlFairygirl Posts: 55,117
    If there are still flowers appearing, it's worth removing them. I always used Resolva as it was much quicker than Roundup, but you're right - they can take a long time to die right back to the root. 
    The new stuff has a different make up. I tidied the boundary edge outside my garden yesterday and  I had to remove emerging flowers from the dandelions I'd sprayed the previous day, even though the foliage was well blackened. They're very tenacious!
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • LoxleyLoxley Posts: 5,698
    Yes they will still be viable. Roundup kills thoroughly but slowly, kind of like a low dose of polonium. Roger Brooks has some excellent blog posts about it.
    "What is hateful to you, do not do to your neighbour". 
  • JennyJJennyJ Posts: 10,576
    I agree, leave the weedkiller to work, just nip off any flower heads that appear before the  plants die.
    Doncaster, South Yorkshire. Soil type: sandy, well-drained
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