no. but if you use the same ip for all sites it wont help as much
and try the flowerrs sight linking to gardening and healthy living linking to flowers and yoga linking to gardening and gardening linking to healthy living.. that way none of the sites are linking to eachother and you get a type of 1 way link
I'm doing this with a few sites with the same IP address. No problems so far, and the links do seem to pass pagerank even though they don't seem to boost rankings as well as inbound links from other sites might.
My rule: if it makes sense for visitors, then link; otherwise, don't.
My personal experience is I haven't noticed a difference if they are on the same IP or not. I have 6 diff ones now, and it seems to be doing the same thing as when I had them all on one.
But Google hasn't punished the links, they have been helpful for me. However, all of my sites have related content.
I moved most of my sites to a better webhoster, and hosted them in a reseller package with 3 dedicated IP's (but in the same C block), and I did noticed some differences, which is a pitty, because I really wanted to have all my best sites under one quality webhoster.