A link from a floral website would not be relevant to a computer website, so it would not do much to improve PageRank.
A link is worth more for your PageRank if it comes from a site that is relevant to your site.
For example, a rather dubious adult website managed to get a pagerank of 10.
For Google to hold its own against upstart search engines, it must deliver on its PageRank promise.
Google uses PageRank (PR) to determine a page's importance on the World Wide Web.
Link Popularity and Google PageRank are almost secondary for the overall success of a website.
Many webmasters are still obsessed with the green PageRank bar in Google's toolbar.
Many webmasters speculated that Google might have discontinued the PageRank information.
Most website owners do not utilize properly what PageRank they already have.
The number of links on a site also plays a role in how valuable the link is for your PageRank.
Then you would be getting 80 times more PageRank boost from the Ugly Duckling website than you would from the 500 pound gorilla website.