When it comes to rooting performance, don't underestimate the importance of healthy stock plants.
If cuttings don't root, most growers examine light, RH, rooting hormones, etc.
But if your stock plants—also referred to as mother plants—are neglected, how do you think the cuttings will perform?
Malnourished or neglected stock plants will not provide healthy cuttings that root fast.
Even well-cared-for stock plants that aren't correctly pruned will result in tough, hard-to-root cuttings.
For best results, renew your stock plants every four months, and prune them back every two weeks. This will ensure that when you need to harvest large numbers of cuttings, they will be available and ready to root.
Lesson: love your moms!