So a while ago (10th December).... I did this to my Blue Glow.
Been checking on both the base and the head reasonably often, and we finally have some movement!
Head still hasn't set roots (agaves can be SOOO stubborn). Have applied some rooting hormone liquid to it today to hopefully get it moving along
Not sure how good your eyesight is.... (mines pretty terrible these days) but I can see the start of two baby Blue Glows on the next photo.
And in final exciting news - my Aeonium Mardi Gras has survived summer!!!