why does my cactus farm didnt work

[hanzodfanger]

i have an issue my cactus in my cactus farm doesnt work the cactus doesnt want to grow and i think there nothing wrong with it but why is it not growing?
pls stated help

 

[progamezia]

you probably built it wrong,check a tutorial video

 

[quit]

You need to replace the blocks to fences

 

[benjo2]

i have an issue my cactus in my cactus farm doesnt work the cactus doesnt want to grow and i think there nothing wrong with it but why is it not growing?
pls stated help

Place fench instand of cooblestone i think that should work

 

[hamenadr]

replace all cobblestone with fences .

 

[pretty_technical]

i am not really a redstone expert xd