Flower with holes

I created a flower with holes using openSCAD. Here is the code below:

//globals
fl_radius= 15;
fl_height = 13;

module flowerObject()
{
difference()
{
union()
{
cylinder(h=fl_height, r = fl_radius, center = true, twist = 10, slices=4);

for(r=[0:5])
{
rotate([0,0,r*360/5]) translate ([fl_radius, 0, 0]) cylinder (h=fl_height, r= fl_radius, center=true);
}
}