Autumn can suit some succulent cuttings, but the best time depends on the plant's activity and the conditions available for rooting. Check the species and local temperatures before treating one season as universally best.
Look for active growth
There is no single best propagation season for every succulent. Some plants are growing strongly in autumn, while others are entering a less active period. The local temperature and the conditions available for rooting matter as much as the month.
Choose the right material
Confirm whether the plant can be propagated from a leaf, a stem or an offset. These methods are not interchangeable. Select healthy material and use clean tools where a cut is needed. A plant already struggling with soft stems or damaged roots is a poor starting point for a propagation experiment.
Prepare the rooting conditions
Use a suitable freely draining medium and provide light that does not scorch unrooted material. Manage moisture for the species and the stage of rooting rather than keeping every cutting wet. Label each batch with its name and date. If the available conditions are unsuitable, waiting for a better growth period is more sensible than taking cuttings simply because autumn has arrived.
Related reading: Spring Cuttings: Choosing Stems and a Suitable Medium.