Skip to content

Grodan Grow Cubes – 2 Cubic Feet






Grow-Cubes are small 1/4″ cubes of stone wool.  Each cube has four surfaces from which excess water can drain. This way, even if you water a lot, the Grow-Cubes will not get waterlogged. These are great little cubes of Rockwool that are used as a growing medium in a net or regular pot.

  • Grow-Cubes stack on top of each other leaving air space in between them this promotes root growth.
  • The Grow-Cubes are the driest of our products with properties of a 50/50 mix. (50% water/50% air), Very easy to mix with any other potting mix.
  • Lightweight; approx. 1/10 of the weight of a bag of potting soil.
  • Size: 2cuft bag.

Only 2 left in stock

Your Garden's Success is our #1 Priority

HTG Supply is committed to providing you with the very best products, pricing and service in the industry. We will ship your order fast and discreetly packaged to protect your privacy. Buy with confidence knowing your HTG Supply purchase includes simple returns as well as lifetime product support. Call our team of real growing experts with your purchasing or product use questions, and we will be here to help!

See it for less somewhere else? Give us a call and we’ll beat any online competitor’s price!

Customer Service:  1-866-710-GROW (4769) | | Hours: Mon-Fri 9:00 a.m. to 5:00 p.m.


These are great little cubes of rockwool / stonewool that are used a growing medium in net or regular pots. Perfect for Ebb & Flow and drip irrigation hydroponic systems as well as a medium to hold root balls in Aeroponic and Deep Water hydroponic systems.

Want to try a hydroponic medium along side your soil grow plants in pots?
Just fill up your container with the cubes, water with a hydroponic nutrient and watch your plants grow hydroponically!

Made in Denmark since 1969, rockwool (also called stonewool) is widely recognized as the ideal growing substrate. For any growing application, rockwool offers speed, ease of use and cleanliness. Grodan and Paragro rockwool is known for its top quality, consistency and performance.

Weight 8 lbs


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.