Iwould say it all depends on what the weed killer is to start with because if it's a contact type then your bushes might recover from a light spraying.
If on the other hand it's a systematic weedkiller that stays active in the soil then it could be a diffrent story, and how bad it is depends on the the type used as council have access to commercial weed killers that we can not get hold off.
Get hold of the council and explain what has happened and you would like to know what chemical was used and the type ( find person i charge of parks and recrasional areas ).
If it's systematic then it could also be in the soil as well as the plant so replacing the plants will just put new plants in polluted soil but if it's contact based then there could be hope for the bushes .
Personally until;l you find out which i would give them a good soak with plain water to wash as much weed killer of the bush itself that way the damage might be less.
__________________  ---) CARL (----
ILFRACOMBE
NORTH DEVON
a seed planted today makes a meal tomorrow! www.freewebs.com/carlseawolf  now in blog form !  UPDATED 01 / 04 / 08 |