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Sold by: The Hydroponic City Los Angeles
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Grodan Rockwool 1.5" cubes (45/Pack)

4.5 4.5 out of 5 stars 543 ratings

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  • An inorganic and sterile growing medium made from spun molten rock
  • A superior medium for rooting cuttings
  • Provides 20% air space when saturated
  • Does not contain nutrients
  • Condition by soaking for eight hours

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 23.9 x 16.8 x 24.2 inches; 7.37 ounces
  • Item model number ‏ : ‎ GL56713040STRIP
  • Date First Available ‏ : ‎ July 6, 2004
  • Manufacturer ‏ : ‎ Grodon
  • ASIN ‏ : ‎ B00CJICFKY
  • Customer Reviews:
    4.5 4.5 out of 5 stars 543 ratings

Product Description

Three strips of 15 wrapped Mini-Blocks - 45 total blocks each measuring 1.5 in. square.

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Customer reviews

4.5 out of 5 stars
4.5 out of 5
543 global ratings

Customers say

Customers like the quality, size and efficiency of the Rockwool cubes. For example, they mention it's a fantastic planting medium, works great in hydroponic systems and is easy to use.

AI-generated from the text of customer reviews

113 customers mention93 positive20 negative

Customers like the quality of the toy building blocks. For example, they say it's a fantastic planting medium, and works well for starting seeds. Some mention that the cubes are easy to use and make planting your veggies a pleasure.

"...It isn't near as messy and it makes planting your veggies a pleasure instead of a chore trying to keep up with a million little black cups and..." Read more

"...Then I just leave it alone and the seeds have always sprouted and grown wonderfully in these cubes." Read more

"...Within a week all seeds sprouted, and some are 2 inches tall (the dill is about 3 inches). Even the rosemary is doing well...." Read more

"...Success rate is high and you can plop them right into your potting medium and you're good to go. Also works well for clones...." Read more

94 customers mention94 positive0 negative

Customers are satisfied with the efficiency of the toy building blocks. They mention that it works great in hydroponic systems, produces consistent results when used correctly, and is wonderful for cloning and starting seeds. The packaging from Grodan was very efficient, and the blocks are very simple to use. They also say that the blocks work well with 4x4 Rockwell cubes or plant directly into pots. Overall, most are happy with their purchase and recommend them to others.

"...my tomatoes, cucumbers, squash, pepper and zucinni seeds in and they work great...." Read more

"...Works very well." Read more

"...They work great in hydroponic systems but are also pretty cool if you own one of those little indoor kitchen gardens for herbs and whatnot, you can..." Read more

"...These 1.5's are great, they go directly into the 6-4 inch blocks.. And the wrapped cubes are great for clones because, once they are PROPERLY treated..." Read more

28 customers mention28 positive0 negative

Customers find the toy building blocks easy to use. They mention that it works well in a hydroponic setup, is convenient to use to start seeds, and is easily integrated into the hydropnic system. Customers also say that the cubes are convenient to clone and transplant.

"...It is so simple and this stuff holds a lot of water so you dont have to water all the time and it also makes it harder to overwater them...." Read more

"...These are easy to use." Read more

"...They are individually wrapped so they are easy to handle and stand on their own. These are very nice...." Read more

"These cubes are convenient to use. Just split them open, place the roots from your plants in them, close the cube, and then..." Read more

15 customers mention11 positive4 negative

Customers like the size of the Rockwool cubes. They say they are the perfect size for putting their newly sprouted plants in, and fit perfectly into 3.75 net pots. Customers also mention that the cube is convenient in size and structure, and is great for getting seedlings going.

"...I find that they are the perfect size (1.5") to fit in my 2 inch net pots...." Read more

"These are the perfect size for putting my newly sprouted plants in the Kratky cups...." Read more

"...The roots are looking good. They do fit perfect into 3.75 net pots. I still think the started cubes will work out better for me...." Read more

"...They are 1.5 "ish" or larger. They are two BIG to put IN the tray. I flipped they tray over snd they do fit just not in the slots...." Read more

12 customers mention9 positive3 negative

Customers like the moisture resistance of the toy building blocks. They say it holds moisture for the most optimum amount, retains the perfect moisture/oxygen content, and absorbs a lot of water. It also makes it harder to overwater them and holds water like a sponge.

"...It is so simple and this stuff holds a lot of water so you dont have to water all the time and it also makes it harder to overwater them...." Read more

"...clones because, once they are PROPERLY treated, they retain the perfect moisture/oxygen content. 100% successes rate, if you know what your doing...." Read more

"...The rockwool under light dries real quick, even with water in the bottom tray it does not soke up to the top of rockwool for seedlings...." Read more

"...Cannot imagine doing with them now. Hold water like a sponge so minimize problem of moisture fluctuation during incubation that can occur with soils/..." Read more

9 customers mention9 positive0 negative

Customers find the toy building blocks versatile. They mention the wrapped cubes are great for clones, and the rockwool is the best for Clones. The cube is individually wrapped in foil, so you can label them.

"...I really like how they come individually wrapped in the sheets as that allows you to leave the wrapper on and lets me focus the root growth down..." Read more

"...They are individually wrapped so they are easy to handle and stand on their own. These are very nice...." Read more

"...they go directly into the 6-4 inch blocks.. And the wrapped cubes are great for clones because, once they are PROPERLY treated, they retain the..." Read more

"Rockwool is the best for clones. Nothing else compares. These individually wrapped cubed are very convenient and easy to use...." Read more

8 customers mention5 positive3 negative

Customers are mixed about the growth rate of the toy building blocks. Some mention that they're fast and easy to use, while others say that the seedlings sprouted yet were slow to grow. However, the cubes do give the seedings good support.

"...These are fast and easy to use." Read more

"...Watered them in well. But six seeds never grew their roots outside the block! Weird...." Read more

"There was no lag in their service or handling my order. It was processed and shipped very diligently...." Read more

"...i had placed a 1 1/2" rockwool cube, and have been able to hydro germinate seed rapidly." Read more

but these blocks are fantastic. They are more sturdy than ones that I ...
5 Stars
but these blocks are fantastic. They are more sturdy than ones that I ...
I never thought that I would write a review about rock wool blocks, but these blocks are fantastic. They are more sturdy than ones that I was buying and they don't fall apart when you try to sepperate them. Also the plastic around the edges helps keeps them together.
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