ekh_southwest said:

Two summers ago I pulled it all up however it came back fiercer, last
year I was constantly maintaining and trying to control it but this year
its almost taken over the front garden. Ive used Weedol Rootkiller+ on
it this year and it just appeared to damage the part of the leaf that it
landed on! Until now Ive found this weedkiller extremely effective and
Im running out of ideas on how to get rid of it.

Ive attached a couple of photos, the first 2 are of the flowers and the
plant, the second to show how its taking over the garden and the third
shows the leaves and the damage to them from the weedkiller.

Any suggestions would be amazing, especially if somebody knows what this
is?

It looks like a double-flowered form of Bouncingbet (Saponaria officinalis).
It spreads vigorously from rhizomes and also from abundant seeds. The key
to control is to eliminate the top growth over and over again to deplete the
rhizomes and to rigorously remove any new seedlings.

Bouncingbet has been officially designated as an invasive weed in Colorado
(where my mother lives) which requires it be "either eradicated, contained, or
suppressed" and the suggested control method is to "[h]andpull or dig only
single plants/new infestations when the soil is moist" to ensure you remove
as much of the root system as possible. The recommend herbicide is
Chorsulfuron (brand names: Glean, CORSAIR, Telar) applied at "bolting to
bud growth stage."

Link to Colorado website:
http://preview.tinyurl.com/cn2ddj7

Other states have not gone as far as Colorado in restricting this plant, but
it is a problem in Long Island, New York and parts of Michigan. (The
Michigan Nature Conservancy has discovered thay glyphosate does not
offer more than a 50% chance of control, at best.)

The best time to attack a plant like this is just as the flowers are forming,
as the root reserves will be lowest at that time. Too bad it is so very
invasive, as the flowers are pretty and fragrant.

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Pat in Plymouth MI

"Yes, swooping is bad."

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