The best time to is summer, but our gardening expert has had good results as late as September
This summer has been kind to cacti and they’ve responded with new growth. My bunny ears cactus, Opuntia microdasys, put out three new pads in a matter of weeks. That is until I decided to clean the window behind it and with one slightly clumsy move all three new pads were stuck to the cleaning cloth instead.
Not such a mishap, though, as cacti are surprisingly easy things to propagate. The best time to take cuttings is summer, but I’ve had good results as late as now, and if life gives you unexpected bunny ears to propagate, or the bottom of your cactus starts to rot, then emergency cuttings are the best way to rescue the plant.