I have a lawn full of crocus. My question is: Will the application of
'Weed and Feed' (herbicide and fertilizer combined) kill or negatively
affect my many crocus?

Good question! 

This website gives a lot of information about generic weed and feed,
sold under 10 different brand names:

www.pesticideinfo.org/Detail_Product.jsp?REG_NR=00022800301&DIST_NR=071902 

Crocuses are not mentioned as a pest, but neither are any other
flowering plants, so I don't think that's conclusive.

I called a few of our local garden centers who say that unless the
"weed" is specifically mentioned on the bag, it should be all right to
use. Since crocuses  grow from corms, they are different biologically
from weeds which grow from seeds. Could you do a test this year and
put weed and feed down on just a few rows in your yard, or just around
the edge where you are sure there are some crocuses, and see what
happens?

I'll continue researching this, because I don't think I've answered
your question. Maybe someone else can pop in with something
definitive.

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Request for Answer Clarification by peislander-ga on 18 Apr 2005 17:59 PDT

Hello

Thank you for the information about the corms. A search using the
words: crocus corms herbicides brought up this link:
http://pubs.caes.uga.edu/caespubs/pubcd/B918.htm

There they warn:, application of herbicides can affect crocus bulbs adversely

More definitive information would be very much appreciated.

PEI

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Clarification of Answer by jab-ga on 20 Apr 2005 11:32 PDT

I've just been on the phone with a master gardener (in Wisconsin),
referred by the local county extension agent, who says that a
pre-emergent weed n feed will not harm crocuses, but any other kind
will.

Thanks mister2u

PEI

Most lawn weedkillers work through the leaves of the weeds, so after
the crocuses have bloomed and the leaves disappeared (mown) I have had
no problem with this.

I would like to know how things faired this past spring with weed and
feed and crocuses - and if anyone has information about applications
of weed and feed in the fall before or after bulb planting (crocuses,
daffodils, snowdrops in the lawn), that would be helpful too.  Many
thanks.

goodness. Weed and feed feeds lawns and kills BROAD LEAFED PLANTS.
Since weeds are only plants that grow where they are not wanted
thekiller does not select 'weeds' but works on broad leaves. Crocuses
have broad leaves. BUT they die down in summer and may not be affected
in the fall. Experiment and read the labels. MOST products - of any
kind - have 1-800 numbers specificall for questions like these
regarding their products. They will research and call you.
TIP: if you are spraying your plants with weed killer, like ROUNDUP,
which kills everything it is better to use a broom and a bucket of mix
and make like you are sweeping. You will not get spray on anything and
can go around quite close to other plants. Also if you have small
areas in among other plants you can dip a cloth in (do not drip) and
just wipe the unwanted plant. It will go to the roots only and not
kill other plants. read carefully though..roundup and maverick can doi
this but many like killex leach in the ground and kill everything and
are not enviro or safe with kids and pets around.