Bryce.......please post some photos of your rostratas when they were alive. I bet the ones which died were not true rostrata........if they have Yucca rigida genes in them they will be less hardy. 😥

Yucca linearifolia is probably less hardy too (looks like rostrata).

What was your low temperature?

......if they have Yucca rigida genes in them they will be less hardy. 😥

I agree.

Also where were they planted? Could be where cold air pools, or under eaves where water runs off?

Bryce,

they pulled out of the ground. One of them the base of the root was still attached so I brought it in and im going to try to see if it will reroot

Can you take some photos of the remaining root(s).
And what they look like where the root was attached.

I hope that one makes it for you...let us know what your technique is.

With succulents like jade tree, I leave it exposed to air for a few days to callous over before replanting between stakes/ties to keep it from falling over.
But haven't a clue what to do with yuccas.

Look forward to seeing pics.

Barb

Could the soil have caused it to rot? Mine's in a mix of about 75% pea gravel and 25% sand. Maybe even higher percentage of pea gravel.

They are in a raised bed that is mostly sand mixed with some pea gravel and potting mix, id say it's about 75% sand. It appears that the roots basically just like melted away. I will try to look around to see if there is any more root attached and try to take a pic of it. The small one planted in the middle seems to be healthy still and appears to be much cold hardier as it's roots are well attached and the leaves have no burn. The larger ones had some burns from the cold on the leaves. Here is a pic of the rostratas in there better days, the hardy small one is in the middle.

Looks like they are buried too deep into the soil. Aren't they? Perhaps some unlike contacts with a growing tip.

Hi Bryce

It's very difficult to ID those seedlings.....seedlings will be less hardy.....what was your low temperature?

Could be all of the above no? Wrong genes in the plants, small seedlings and maybe too deeply planted?

Even if they are rostrata, if they are seedlings there would be variation on them, being crossed or not. IF the grower has a bunch of yucca in close proximity, then it could be a cross as tim suggested.

planting that young of a plant for an unprotected first overwinter is risky in itself. I keep backups potted in the house when I plant out something that young. Adam Zone7

The little one in the middle is the hardiest one?
Yet it shows the most damage.
And its small size (of the three) probably means it wasn't robust even before you got it.

Everybody gave good possibilities.
If you get/got a lot of rain, sand isn't a good idea in your soil mix.
Sand tends to pack tightly and hold soil moisture longer.

Do roof downspouts drain to that area? If so, way too wet.

Barb

Yeah Maybe they were planted slightly too deep but that may just look that way because of the rocks. I have noticed the small one was not planted quite as deep, maybe thats a reason it's alive still. I dunno ill try to not plant them as deep next time and next winter ill protect them. No there are no down spouts in the area they are out in the open, several feet away from the house. The coldest it has gotten so far is 13 F.

barb the smallest one in the middle has the least damage and its rooted well still, but it came from a different source so maybe it's a more cold hardy variety with a higher moisture tolerance. Also I took the peice that had a root still attached trimmed up the dead leaves and put it in a pot with cacti mix and brought it inside it had bumps on the brown part at the base that look like little nodules, like baby roots. We will see what happens.

Glad you're able to eliminate roof drain issues, etc.

The little nodules are good...it's the beginning of new roots as they develop.

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Barb

Those Rostratas look nice and healthy they have big fat roots. 🙂 Did you grow those from seed?