If you want it to taste like blueberry why not just buy some high grade fem seeds and grow it? I think you will probably F up your grow if you inject the plant with anything but, thats just my opinion.
We just made some yesterday. I used the butane method and got some really nice black hash oil. It is super potent....The one-hitter quitter... LOL
http://www.youtube.com/watch?v=I8spk80yFRo
...there are a ton of people who make it and everyone has a little different method. I recommend...