> Will only mirror 1.3MB and then stops. Received the
> following error;
What error? 404 is a bad link on the site, I see no HTT errors.

> (winhttrack
> -qwC2%Pns2u1%s%uN0%I0p3DaK0H0%kf2A25000%f#f -F
> www.gardenweb.com
The default is to stay on site. The page contains:
HortiPlex Database - <http://hortiplex.gardenweb.com/plants/>
Botanical Terms. - <http://glossary.gardenweb.com/glossary/>
Those are different sites, you didn't get those.

Add a filter +*.gardenweb.com/*
I always run with (no external pages) so you know where the mirror ends.