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In my experience (first did pa1/6 in 2002 then again in 2016) most major weeds will still produce viable seed if in flower or bud when systemic herbicide is applied. The seeds growth can be deformed, but still can flower and set seed.
I now handweed most of the time.
By & large if the plant has reached seeding stage they are going to be viable in some form or another but much depends on the growth stage at the time of spraying. Some plants will actually speed up the seed ripening and shed seed after the host has died (ragwort).
Plants generally respond best to a pesticide (quickest kill) when the plant is actively growing and pre-flowering..
thanks. we've just got a large new site in waterlooville so late to the party. first application about to happen but needed to convince commercial customer weeds will be an ongoing hassle for some time to come until we win the war!
What not glyphosate & chikara to give pre and post emergent weed control?
ta for suggestion but its hard surface so would be off-label usage ?
They do recommend mixing the two for killing existing weeds and preventing new ones germinating and it does work pretty well. The only snag is if the weedgrowth is very heavy, the Chikara doesn't make it to the ground so is. wasted. In that situation, I glyphosate first, clear the dead weed growth a few weeks later and then put down the Chikara.
ok... might keep on top of it using roundup. worried as its a large car parking area and have a similar site to sort out from next month. coukd strim first to nock weeds then spray but its worried about weed seeds all over place.