Other - Propagation

[markdahman]

Swim see's plenty of ways only to make cuttings from cactus, however after cutting off the top 6 inches what happens to the bottom part with the flat tip...? Will it form over like before and how long on average till it is normal and growing again? And secondly if swims cutting 1 cactus into 3, aslong as u put em all head upwards in soil they'll heal over and grow roots like normal? Will that be the same amount of time as the top piece or more...?
Sorry if swims to specific but these seem to be unawnserd questions! Thanks