noun
direct planting of a cutting; sticking a cutting directly into soil
Horticultural term for inserting a cutting straight into the ground or potting medium without pre-rooting in water.
バラの枝を直挿しで増やす方法を試してみた。
I tried propagating roses by sticking cuttings directly into the soil.
直挿しは発根率が低いこともあるが、手軽な方法だ。
Direct planting of cuttings sometimes has a low rooting rate, but it's an easy method.
挿し木 is the general term for propagation by cuttings, while 直挿し specifically means inserting the cutting directly into the ground without a separate rooting step.
Compound of 直 (じか, 'direct') and 挿し (ざし, from 挿す 'to insert'). The reading じかざし follows rendaku voicing of さし to ざし.