"D. Staples" wrote:

Stratification helps,

I believe the word you want is 'scarification'.

M-W

scar?i?fy
transitive verb
1 : to make scratches or small cuts in (as the skin) scarify an area
for vaccination
2 : to lacerate the feelings of
3 : to break up and loosen the surface of (as a field or road)
*4 : to cut or soften the wall of (a hard seed) to hasten germination
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