Req: name of these Cactuses and How to Pot them

[new gardener]

Assalam o Alaekum ..
Few days later i got these plants form a friend i know nothing about them like how to pot them and care .. so if u guys plzz help me.. i will be very thank full..



Plzz tell me the names...

[Tahir Khan]

I will start from the last pic...Hope i get the names right.

1. opuntia microdasys albata

2. mammillaria elongata 'copper king'

3. mammilaria 'Cant recognize the specie'

4. opuntia ' Unknown specie'

5. mammillaria compressa

6. the long columnar type maybe 'trichocereus or cereus'

some of you cacti look like rotting to me if they are cut the rotting part with a clean knife in a single cut and dust it with some limestone (choona) powder to stop the rot, then wait for a week to help heal the cut and after that plant them in a free draining soil 2 parts soil and 1 part sand mixed together and just water them once a week.

[Farhan Ahmed]

should they be in shade or sun while cutting sets roots???

[Tahir Khan]

should they be in shade or sun while cutting sets roots???

Yes shade and away from rains specially monsoons..

[new gardener]

Thanks alot tahir sb.. well i will show u some more recent pics so that i get a better idea to pot them.. actually i dont wana loose them in any condition.. can u u just tell me the measurement how much should i cut them. or do they get roots.. or not .. well i got them on 25th of June until today they have changed alot.. i will show them to u later tonight..
Jazakallah for your advise..

[Tahir Khan]

Thanks alot tahir sb.. well i will show u some more recent pics so that i get a better idea to pot them.. actually i dont wana loose them in any condition.. can u u just tell me the measurement how much should i cut them. or do they get roots.. or not .. well i got them on 25th of June until today they have changed alot.. i will show them to u later tonight..
Jazakallah for your advise..

Just remove the rotting tissue to a point where you can see fresh undamaged flesh.

Here is an example

https://mycotopia.net/forums/attachment ... 0022.1.jpg

The cactus cutting on the left side shows orangy unhealthy tissue that you don't want.... on the right side the cutting has perfectly white flesh.. cut it up to that point, dust it with limestone(choona)powder and place it aside in a well ventilated room for about a week then plant it.