Ever since I got my 2nd hand dragon tree, the soil has had these yellowish peaks. Until today, I never really thought about them.

However, I added some new soil on the old about a week ago. The yellow peaks seem to be already appearing. It is also on the ceramic pot.

So far I had attributed them to calcium deposits from evaporation, but Google rather proposed yellow slime mold. I have never seen any real fungal activity in the pots.

This happens also in the 2nd generation of the plants, i.e. with cuttings.

Here are a couple of photos from a pot where some cuttings are growing.

soil in a pot more soil in a pot

What do you think these yellowish things are?


2 Answers 2


These are mold or fungi that are eating the organic matter in the soil less mix which will have a higher percentage of bark and peat than soil in the garden.

All they need to get going is wet soil. They do no harm to the plant.

You can use a chopstick or old fork to break up the top of the soil and try and keep the plant a little drier. Dragon tree or Dracaena reflexa var. angustifolia (Dracaena marginata) is easy to overwater and best cultivated with more light and less water


I just showed my plants to two professional plant caretakers. They said that it certainly is not mold/fungus, but precipitate. Mold or Fungus would also have a distinctive smell.

I also saw a while ago some other dragon trees with the same precipitate.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.