Are you trying to root a single leaf? Or a rosette? Maybe a photo will help.
skopjecollection said:Best bet is to cover the cut part with cinnamon, let it callous, and place it in soil. Dont know how well it works, , for me 6 out of 11 attempts were successful(but mostly with aloe, not haworthia/haworthopsis)
Baja_Costero said:If there is no rot in the stem, you should be good to go. Get rid of the old soil and bleach the container if you want to use it again with this plant. Or find a pot that's wider than deep, with holes at the bottom, that's just a bit bigger than the rosette. Use soil for cacti (bagged cactus mix) or use regular potting soil mixed with an equal volume of pumice, perlite, or equivalent. Put the cutting on top of the soil without burying any leaves and with very little stem buried. Put the pot in bright light (indoors that would be by a sunny windowsill) and wait a week to water. Then water well and from there on out only water when the soil is dry at depth (not just the very top layer). This will depend on light and temperature and humidity, since evaporation is the only way the water will leave the container until the plant starts drinking. When you see new growth on top you have a very good indicator that the roots have sprouted and are working.