try this code
to setup
create-ordered-leaves 5 [
set size 6
setxyz 0 0 -10
set color brown
set shape "leaf"
tilt-up 90
]
end
to go
ask leaves [
set color 72
pd
set pen-size size + 1
fd size
set size size * 0.8
left 20 + random 20
tilt-up 10
hatch 1 [
right 40 + random 40
tilt-down 10
]
]
end
and click on go as many times as you want