Vermiculite is my preference for an incubation medium for ball python eggs. I have had great success with it. It is inexpensive and readily available at my local garden center. I prefer the coarse, “chunkier” grade vermiculite over the fine grade. It is easier to work with and it produces less dust. Look for vermiculite that is sold in sealed plastic bags. The plastic bags tend to keep the vermiculite dry; vermiculite sold in paper bags or in open containers can pull moisture out of the air – you will be starting with wet vermiculite.

To use vermiculite as an incubation medium, you need to add water to it. Mixing vermiculite is not an exact science. No two batches of vermiculite are exactly the same. Like I mentioned above, I purchase vermiculite in sealed plastic bags. This way, I at least have the piece of mind that my “base” vermiculite is dry. I start off with the certain amount of vermiculite, I add an equal amount of water to each batch, and I use the “clump test” to see if the batch looks good. But in the end, each batch may need some fine tuning…..one batch may need more water while another will need the addition of dry vermiculite. It is not an exact science.

I mix my vermiculite in a 5 gallon bucket. I use a ratio of two and a half pounds of vermiculite to one cup of water. For all you metric people out there, this is ABOUT 1100 grams of vermiculite to 240 milliliters (I did mention that this is not an exact science, didn’t I?). I have made a mark on my bucket to avoid having to weigh the vermiculite every time I mix a batch. For me, the mark is seven inches from the bottom of the five gallon bucket. I know that when I fill the bucket to this point, I have about two and half pounds of vermiculite. For you, you are going to have to weigh the vermiculite and then make your mark. While all five gallon buckets are the same volume……not all have the same dimensions.

I add my cup of water and mix the vermiculite with my hands. I give the container a thorough mixing, making sure to get to the vermiculite on the bottom. I use the “clump test” to see if the vermiculite is ready. A clump that crumbles apart indicates that the mix is too dry. It is too wet if you can squeeze water out of it. A perfect batch clumps and holds together nicely.

When in doubt, error on the dry side. It is easier to save eggs that are incubated in medium that is too dry. Medium that is too wet kills eggs.

I have read some articles that state overexposure to vermiculite dust may pose a health risk since some manufacturers sell vermiculite which contains asbestos. I don’t consider mixing a few batches (or 30) of vermiculite overexposure but it certainly is greater exposure that the average person. Either way, a mask that filters out dust wouldn’t hurt. They are not always available, but in the past few years I have been able to purchase bags of vermiculite that were clearly marked “asbestos free”. Latex gloves are a good idea too. No major health concerns here……..the vermiculite tends to stick to your hands.