Some people use cinnamon, but I've never used it. As long as you keep the cut Euphorbia in a dry area you should be fine. I forgot to add when you cut your plant a toxic white substance will ooze out. Make sure to keep this away from eyes and skin. Cut till the flesh is fresh with no dry dark spots. With Euphorbias the area that's rotted will not have that white subcstance, it will be brown, dry, and mushy. Cut until you see nice light flesh that oozes that substance. To stop that ooze you can run under warm water. Then just take a paper towel and soak up the water. Keep very very dry. Goodluck:).

I would think that your non-variegated one would have the same name, just minus the "variegata" at the end most likely. I still haven't found any species-specific information on the net/web for rooting this one, but after reading a page (that I will paste below along with the url to it, since it has photos), I'm going to take a good look at my plant and see if I feel safe to take 3 or more cuttings from it to try rooting in different ways. The article does cite some specific species, but unless I overlooked it, mammilaris isn't one of them. You might find this info of use though - I know it does talk a bit about Medusa's Head - and I've got cuttings rooted of that one, so this additional info was nice to tuck away in my memory banks (and of course will get saved into a text file as well :) copied info from: http://www.euphorbia-international.org/Cultivation/propagation.htm Vegetative Propagation Propagation of euphorbias from cuttings is the easiest and quickest method for many species, and is also a way to prune an old plant back into shape. Cuttings should be taken with a sharp clean knife, if possible laying the plant down on a clean and smooth surface and using a pulling, rather than pressing motion to obtain a clean and clear cut. Branching species should be cut if possible at the branching point. Solitary plants such as E. bupleurifolia or E. piscidermis can be decapitated to encourage production of side shoots which can later be removed and rooted. The best time to take cuttings is in the spring when growth starts, but summer is also suitable. Cuttings taken in autumn or winter have little time to root, and so cuttings should only be taken as an emergency to rescue plants suffering from root rot. The latex appearing after cutting must be completely washed away in a glass of water or by spraying. Cold water stems the flow quickly as does brief exposure to a candle flame or match. Euphorbias with large leaves should have leaves just above the cut removed with a knife. The cut surface should be left to dry before planting, one or better several days for leafless species. Leafy Madagascan species need only dry a short time. Dusting the cut surface with a hormone rooting powder will help roots form. For euphorbias we recommend 0.1% naphthyl acetic acid and not indolyl acetic acid which is usually found in shops. The planting medium can be the same as for seed sowing with the addition of some sterilised drainage material. Rooting can take longer than expected but is accelerated by raising the soil temperature to around 25 C using a thermostatically controlled warming mat. Direct sun should be avoided. If unrooted cuttings dehydrate, they can sometimes be saved by soaking in water at room temperature until then swell up again and can be replanted. Rooting cuttings Euphorbia greenwayi var. greenwayi Euphorbia myrioclada Euphorbia similiramea A fast rooting method, which does not suit all species, is to stand cuttings in a narrow glass and fill up to 2-3 cm with water. Rooting can occur in 10-14 days. Some euphorbias that can be rooted from side shoots continue to grow as branches and do not form the typical plant form. The medusa-head species are in this group as well as E. brevitorta, E. groenewaldii, E. tortirama and others. For these the so-called two-step cutting method is required. First a cutting is taken in the normal way. When this has rooted, a second cut is made just above the point where roots have formed and the cut is treated in the normal way. The tip can be re-rooted and when large enough can be cut again. The rooted stump will normally produce a plant of form typical to the species and this can then be removed when large enough from the mother cutting. Some Madagascan euphorbias (E. francoisii, E. cylindrifolia, E. pachypodioides, E. ankarensis, E. millotii) have been successfully propagated from leaf cuttings. Leaves are gently pulled from the plants (not cut) and put into cubes of rock wool which are then placed on coarse sand in a tray. The surface of the sand should be covered with water (putting the leaves directly into damp sand also works, although with greater losses). Hormone rooting powder and fungicide assist the process. Both gentle heat or a cool position with a plastic cover to increase humidity, should produce the desired result. After 40 days the plants are sufficiently well developed to be potted. Leaves of E. decaryi, E. primulifolia, E. moratii, E. cremersii and E. decidua will produce roots but do not develop plants. They remain as rooted leaves. Finally a few words on the toxicity of the latex. Even small amounts can cause painful skin irritation. If you get it on the skin, it should immediately be washed off thoroughly under running water. On no account let the latex come into contact with the eyes or mucous membranes.

I doubt the solid green will turn variegated as it ages. You probably know that it's not uncommon for variegated plants to revert to green, which is likely what is happening on that branch. Not sure about a solution other than cutting the green part off, and hoping the variegation remains dominant, but that might ruin the looks of a plant like this. I'm really impressed by the quick growth! I always thought these were supposed to be slow growers, but i guess i was wrong :)

So an update a year out- Rooting this definitely suits my plant it and forget it personality (yes I kill a lot of plants lol). I took a lot of cuttings, let them callous over, and propped them up in pebble, sand, and a little well draining soil if I remember right. I think I misted it a few times the first week or two then ?maybe a couple more times over the fall and winter. It was on a shelf in front of a west facing window. One or two small ones dried up and one larger one that had cuts on both ends dried up. This spring when it warmed up I set it outside where it got some shade from other plants and a tree. Not long after I set it out, one of the cuttings got knocked over and there were 3 maybe 3/8” roots. I put it back where it was and watered it in. We’ve gotten a couple good rains and I noticed last week there was new growth! Well, I still can’t figure out how to get pictures on here right, but you get the idea. So I guess the best advice I can give anyone that wants to propagate this euphorbia is year long benign neglect :-) Lisa