I always have such a difficult time getting smooth petal edges on my buttercream roses. It seems I make 5 for every 1 I really like. What am I doing wrong? I can see in a lot of other pictures that they don't have cracked edges. HELP!!! Roses have been my nemisis since I started decorating for fun about 6 years ago. 
I had this problem too, but I was able to fix it (thanks to the wonderful ladies at Cake Central!). Try thinning your icing down a bit and see if that helps with the cracking. In my case, the tip was the culprit. My #104 tip that came in my kit had a really, really tight small end. I went to Michael's on the suggestion of someone on the forum, and bought another tip. Even in the store I could tell that the #104's they had were much bigger than mine! The smaller end was rounded instead of pointed, and now my roses look much better (see my photos for the difference!). Good luck! 
I looked at the difference in your roses and mine look like your early ones. I'll have to try a new tip too.
Also try taking the tip of a knife and opening up the small end. If it works, great and you saved the time and money on having to buy a new one.
There are a few reason why that happens. If your pressure isnt consistant you will get torn edges. if your tip is closed at the point too much and if your icing isnt right. Piping gel helps fix that as well. I like to use the victorian rose tip #97 this will help hide any torn edges.
Good Luck!
I did open the narrow end of the tip like others said. I also add corn syrup (instead of the piping gel) to mine. I think that has made the biggest difference. Also make sure the icing isnt too stiff and you have a firm enough pressure.
I use an all crisco frosting for my flowers. It works great, holds up in heat well, & leftovers last forever in the fridge!
I've had the same problem as you MissT. I will definitely try these new techniques b/c I hate the way my roses look. See my most previous orange basketweave cake. My roses are torn on the pedal edges.
After I open my #104 tip so more, I can't wait to see how my roses will turn out.
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