Now the plants grow at the same pace into random shapes. What if they are aquatic plants and are shaped by the water flow? Can I apply the mouse position to influence where (to left or to right) the plants are growing?

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Previously, the range of x value change was between -3 and 3. When the difference of x is>0, it grows to the right, and when the difference of is <0, it grows to the left. It picks a random float number between -3 and 3, so the chance to grow left or right is equal.

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For the new version, I detect the position of the mouse. If mouseX is at the left half of the canvas (check if  mouseX-width/2 is larger than 0), the plants grow left, and vice versa. According to how far the mouse is from the central, you get a lean value between -2 and 2. The further the mouse is from the center, the further the lean is from 0. Then the change range of the next x will be random (lean-3, lean+3). So, if the mouse is at the right side edge of the canvas, you may get a lean = 1.99. The range of x change will be random(lean-3, lean+3), which is random(-1.01, 4.99), you will have a higher chance to get a number >0, and the plant has a higher possibility to grow to lean right.

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It does not seem so natural if the range of x change stays the same. I hope it to lean crazier if the mouse if further from the center. So, I changed it to this.x=this.x+random(lean-3*abs(lean),lean+3*abs(lean));