... The image is suffering from resizing compression - I'm sure the full size is sharper than appears here (see the huge pixelation that appears throughout and most apparent on the BG). Here are a couple of threads that have good resizing/sharpening for web information:
http://www.birdphotographers.net/for...read.php?t=839
http://www.birdphotographers.net/for...ad.php?t=18534
I believe a good crop from below would streghten the comp - you could crop to above the two smaller OOF plants below.
P.S. Spend some time reading, learning, posting, and commenting here and you will eventually leave "Program" mode and start taking full control of your DSLR camera with the Av, Tv, and manual modes :-)