I my lupin seeds germinated after 6 days and I didn't soak them or fiddle with sand paper.
Seems like a bizarre piece of advice not sure if originates from ancient times and no one ever questioned its validity.
Lupins self seed naturally and seeds need no help from a sand paper ! I suggest you probably should remove that as it sounds a bit silly.
I my lupin seeds germinated after 6 days and I didn't soak them or fiddle with sand paper.
Seems like a bizarre piece of advice not sure if originates from ancient times and no one ever questioned its validity.
Lupins self seed naturally and seeds need no help from a sand paper ! I suggest you probably should remove that as it sounds a bit silly.