Thanks! So it's fine to just cut off all the sprouting heads at their base? Not all of them have trunks (as far as I can see).

The soil is just because there isn't a good base in the area at the moment (just a slope of clay towards the retaining wall). Any recommendations on what to fill this in with if not soil from the gardening store? Only the agave going into this area.

I love these Agaves they're so pretty. So let me see here they're all in bags?

In your climate these should grow easy. I would cut the big one first leaving about 5-6 inches of stem. Then just start separating the whole bunch little by little. These are pretty resilient. So if you break some leaves and roots no problem. They will be just fine:). I think 3 feet is a good amount of space between them. They will fill the space out.

If you do end up cutting roots off or anything along those lines. You probably will only have to callus over the big cuttings. Just to be safe. Let these plants callus over for at least a week. The bigger stems if cut could take a little longer to scab over. This is important because you don't want to get fungus. Just keep in a well lit very dry spot. You could sprinkle some cinnamon on some of the big cuts. Cinnamon acts as a natural fungicide. I never have to use this, but it's dry where I live.Your rootless cutting may look sad, but this is only temporary as soon as they grow roots they will perk right up:).

I'm curious what's your soil like where you live? I stick my Agave Attenuata in no ammended soil. They're fine:). You gotta remember they're growing in bags now;).

Your soil is clay? We have clay soil here. Sometimes I feel like I can make pots and pans out of my soil:). My Agaves not just Attenuatas grow fine in my clay soil.

Thank you for the reply Kara.

Theoretically there are only two bags, all sprouting from those two original heads over the past 8 years.

I will google how to callous the stems (I have seen information on this already), and see what types of cuttings I get off the plants also (it's hard to tell when I can't see inside the cluster!)

In terms of the soil, I want to fill in the area before replanting anyway (to flatten out the slope/gap they're currently sitting in), so can add whatever is most suitable. I can probably dig up clay from elsewhere on the property to fill up most of the gap, then maybe use soil for the top (for ease of digging/moving around when planting)?

The only place you should ever buy soil from is a bulk soil place. Buying in bags from the garden center is ridiculously overpriced and has way too much organic matter.

If I had a clay slope that needed some fill, I'd just order enough bulk coarse shredded mulch to fill the space, even if that meant I had a foot of mulch.