You can totally propagate succulents in the winter

Before planting the cutting into soil or perlite, it’s important to allow the cutting time to form a callus.Nothing special needs to be done to facilitate this part of the process. Simply lay the leaf or stem cuttings in a bowl, or right on the windowsill to dry down. The end should form a callus within a few days.

After the calloused end starts to grow new baby roots (or even teeny tiny leaves), it’s time to plant them into the soil. At this point, you can put them into individual pots or group them together until they grow bigger. Gently press the roots into soil, or specialized potting medium for succulents, to avoid breaking off the delicate roots.

Once your newly rooted cuttings have been planted, follow basic care instructions for succulents. Allow the soil to dry out completely between waterings and fertilizer sparingly. To keep from overwatering, you can use a spray bottle to gently mist your plants. A light feeding of fertilizer in the spring or summer is sufficient to last the succulent the entire year.