Hrmmm. It is real hard to tell with males. Cause you really don't know/ can't say just how potent they are. I would think with three 2-3 foot plants cut up... Probably 4 stick of butter. I would use scissors or garden shears to cut the stem into like 4-6 inch pieces also... You could do it with just 2 sticks of butter too. The less butter you use the more potent. The more butter you use the more dispersed amount of THC, etc. So it is all real up to you. If you wanna be safe, use 4 sticks.. and then just eat more brownies. Only side effect is maybe adding some weight
Hope you get this in time
KP