Grow Q&A: Algae on Rockwool

A friend of mine started some clones with rockwool and noticed some mold developing on top of the rockwool after a few days. How can this be prevented? – Rucko

Dear Rucko,
One of the advantages to using rockwool as a growing medium is that it stays wet, yet allows oxygen to reach the roots. This can also cause mold and algae to build up on the surface of your cubes, and they in turn begin to compete with your plants for your nutrient solution. Luckily, They need light to live, so if you simply cover the tops of your rockwool cubes with an opaque surface, you’ll eliminate most algae and mold growth on your medium. Some companies make products specifically for this purpose. The one that comes to mind is Cubecap (cubecap.ca). Covering your cubes also has the added benefit of discouraging annoying fungus gnats as well.

Have a grow question? Ask away at deardanko@hightimes.com

Total
0
Shares
Leave a Reply

Your email address will not be published. Required fields are marked *

Related Posts
breeding
Read More

Breeding for Dummies: How To Make Your Weed Plants Screw

Weed plants make sweet sticky love to each other just like your mammy and pappy did, albeit with a lot less grunting. Every time a weed plant gets laid, a new strain is born, kind of. But not every strain is destined for greatness. Read on to learn more about breeding.
Plants
Read More

Reverse Watering Potted Plants

Watering your plant is an art form and, of course, a chore that all growers need to be on top of. It is an essential skill when caring for your plants. In this article, we will specifically discuss reverse watering potted plants.
Total
0
Share