Overwintering Manfreda maculosa 'Silver Leopard agave"
I have recently bought 2 silver leopard agaves and I was told they survive well here in OK. One is kinda small(was in a gal pot) the other is at least triple the size! I put them both in the ground that is part sun (facing east) they get full sun till about 1pm. They have been in the ground for a month and have looked good till well the freeze lastnight. I've read they are hardy to 20F so how do I overwinter them? I've mulched them since I put them in the ground, I watered them well before last night. Do I just cover them with turned over plant pots and heavy mulch like I do with my cannas, lycorus, and other semitropical plants? Or am I goin to have to take them back out of the ground, trim them back, repot them, and place them by a window over the winter?