Bracken is another plant like nettles, buttercup, etc, that has
natural defences against sprays - deep resilient roots, IIRC
interconnecting, moderately waxy leaf surface, etc. The preferred
spray against bracken used to be Asulox, which does work, if rather
slowly over several seasons, but things may have moved on since then.

Certainly with bracken you need to hit it hard and above all
consistently, it's no good expecting one spray to do the trick. You
have to remember too that it dies back completely every year, so
there's probably not much point in spraying it too late in the season.
AFAICR, I used to spray twice with Asulox, once quite early in the
season when the new shoots were 15-30cm above ground, again some time
later, probably about mid-summer, but I can't now remember the precise
recommendations for best results.

And you need to keep doing it every year, because it can take several
years to exhaust the plants' systems and achieve complete kill.

When young and fit, I used to pull it out as well, but it's a hard
pull, and I'd probably struggle to do it now. And again, you have to
keep at it consistently, it's no good just having a go when you feel
like it.

On Tue, 13 Aug 2013 09:13:30 +0000 (UTC), Steve Firth
wrote:

Bracken around
six weeks to two months it seems ver resistant to glyphosate and needs
several treatments possibly at monthly intervals. Also I would bump up the
concentration by 25-30% for elder and bracken. ie Instead of 120-150 ml of
360g/l concentrate per five litres use 150-200 ml.
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