Grafting doesn't "grow" roots on the plant.
The stock roots and supplies nutrients to the graft. When you say, "un-rooted", do you infer the base has no roots of any kind? You should be able to root them in a perlite-turface type of mix with some bottom heat. I'm sure others will have better instructions.

Biker, thanks.

Right, the plants are without any roots. Just smooth skin. They were purchased from China.

I have perlite and other soil-less mediums, but no turface.

Thanks for the help.. I didn't think about bottom heat. Heat might speed up germination..Great! Toni

germination? You mean root production? Most cacti will form roots with warmth, and maybe a dinky tad of moisture.

I been drooling over those online, the pic in the listing looks so cool, they look like little candies!
How did the ones you received look, color-wise?

If I remember correctly, their instructions are to place in dry medium until you see roots emerge from the scab...that would be my advice too!

Morning,

Sorry, it's taken long to reply. Been very busy.

lzrddr. Yes, I was talking about root production.

Grabme. Yep, Astrophytums resembles colorful candy or cupcakes.

I 'finally' snapped pics..

When Astro's first arrived, colors were very pronounced..deep orange, yellow and some green. In fact, the green part was barely noticeable.

This is what happened. I wrote the seller..he told me to let plants sit out about 2-weeks, then place in moist Vermiculite.
He did not mention if bottoms, 'where roots grow,' should be inside or atop Vermiculite.

Anyway, I left all three in the box..opened lid, on the LR rug. Plants got little if any light.

Con: Colors faded quite a bit. Pro: Two out of three rooted without any help from me. :)
Three days ago, I removed from box, placed upside-down on a table under a lamp.
Yesterday, Saturday, the third rootless Astro grew a baby root.

I haven't yet sprinkled roots...don't know if I should.
Actually, I'm afraid. :)

Pics of Astrophytums.

Baby Roots that formed.

I snapped pictures before the third Astro produced a tiny root.

Now I must figure, 1. pot size--height and diameter. 2. Proper watering..In other words, should they be watered directly in medium, or bottom watering. 3. Room temp.

Wish I'd have taken a pic when they first arrived; colors were beautiful.
Hoping, once summer is here, lol, Astro's will be placed outdoors in direct sun. Praying colors return.

Thanks All, Toni