Well, here is the quick tutorial. This tutorial will show you how to illustrate Chinese bamboo with Illustrator Symbol Sprayer and Mesh Tool.
1. Draw bamboo bodyCreate a path like the image shown below with the Pen Tool and fill it with green color. Then, select Mesh Tool

2. Create bamboo stick
Select the bamboo body you've created in previous step, hold down the ALT key, drag it up to make a copy (you can use Copy & Paste if you like). Then shrink the new bamboo body horizontally with Selection Tool. Send this new bamboo body behind the first bamboo body by select Object > Arrage > Send Backward or press Ctrl+[. Repeat this step until you get a stack of 5 or 6.
After you've finished the first bamboo, make a copy of it by ALT drag or Copy & Paste. Select the new bamboo stick, apply Filter > Distort > Twist (Angle=3) so that they don't look identical.
4. Draw a bended bamboo
We want the bamboos look natural, not Copy & Paste, so we need to create a bended bamboo. Repeat Step 1 & 2 to create a bended bamboo like the image shown below. Now we 3 different versions of bamboo: straight, bended, and twisted.
5. Duplicate more bamboos
Make more bamboos by ALT + drag. Selectively copy from different version of bamboos, resize them or flip them around so they don't look alike.
6. Create bamboo leaves
Create your bamboo leaves like the image on the left(below) and fill it with different tone of green. Again, use Mesh Tool to create the lighter spot.
After you done with the leaves, drag it to the Symbols Pallate to create a new Symbol. If your Symbols Pallate is not showing, go to Window > Symbols or press Ctrl+Shift+F11.
Create a new layer and lock the bamboo sticks layer(Layer 1). Select Symbol Sprayer Tool and pick the bamboo leaves Symbol you have created in previous step. Spray it on Layer 2 by dragging the mouse.
9. Symbol Sizer Tool
Now, we need to create various size of bamboo leaves. Select Symbol Sizer Tool, randomly click on the bamboo leaves object. Tips: hold down ALT key+click to reduce size.
Use Symbol Spinner Tool to rotate/spin Symbols.
Use Symbol Shifter Tool to spread(by drag) bamboo leaves out.
Select a lighter yellow-green tone color and use Symbol Stainer Tool to stain Symbols (stain Symbols randomly).
Use Symbol Screener Tool to reduce bamboo leaves Opacity (selectively click on the leaf symbols). This will get a see-through effect.
After you done with the leaves on Layer 2, make a new layer(Layer 3) and drag it to the bottom of the layer list. Lock Layer 1 and Layer 2, use Symbol Sprayer Tool to make more bamboo leaves(refer to Step 8-13) on Layer 3.
15. Add more bamboo sticks
Finally, duplicate more smaller bamboo sticks and send them behind the big bamboo sticks.
Here is the final image.