I have a HDTV blog (www.learninghdtv.com), and I am wondering if it is possible to have 2 or more Wordpress blogs on the same domain (I am assuming I can have an infinite number in different directories), and if these other blogs will hurt my search results for my main blog? I basically planning to throw a bunch of sh*t at the wall and see what sticks, but I don't want to pay for new domain names. If I was to do something completely un-related, for instance a blog about gardening at www.learninghdtv.com/gardening. Is it bad to do this? or as long as I don't have any links connecting the 2 blogs together then it won't have negative consequences?
I would add these as subdomains (eg gardening.learninghdv.com), rather than directories. Google supposedly treats subdomains as a seperate site.