This guide goes for both SMF2 & 3, since the bush tiles are the same, just a different color green. Big bushes can be used for plenty of levels - like grasslands, overgrown castles, grassy caves, etc - so it's very convienent to know how to tile these!
Enough reading, check out the tutorial here! (Well, you'll still need to read the tutorial of course!)
Have fun using these in your levels, and let me know if you have any more questions here in the comments or on my Level Palace profile (recommend).