Roots develop FAST.
day 10 .................................................. ... day 12
Stem diameter of cuttings makes a difference with the vigor of rooting speed and development. Bigger is better.
Thicker stemmed cuttings outperform thinner ones. The stack on the left all have stems of about 4mm or less. The stack on the right all are over 5.5mm.
If I grew a couple more mother plants, there'd be enough >5mm stems to do all my cuttings, but unfortunately the mother plant tray is full- so we'll just hafta get by with wot we got.