Return to the Hydroponics Forum | Post a Follow-Up

growing without netpots

Posted by carb none (My Page) on
Tue, Mar 12, 13 at 0:26


For raft culture, I was wondering if it is a good idea to grow lettuce on rockwool only without net pots.

I'm thinking of cutting a little below 1x1 inch square shaped hole in the styrofoam. I will then insert my 1x1x1 rockwool cube with my lettuce seedling in it. Will the grip of the rockwool on the hole be enough to support the plant once it grows big?

Follow-Up Postings:

RE: growing without netpots

you might have a problem with your crowns or stem rotting. rockwool holds a lot of moisture and you'd be providing it with a constant source to wick it up.
As to your actual question; how well it grips will probably depend on what you're growing. young plants and light plants I don't see being a problem, but something with some weight might be a horse of a different color.

RE: growing without netpots

  • Posted by carb none (My Page) on
    Tue, Mar 12, 13 at 22:56

On your first sentence, do you mean that it is generally not a good idea to use rockwool in raft culture? If so, what would be a good alternative?

As for my original question, I actually based it on this video on youtube.

They use NFT there, so I'm wondering if anyone has experience doing this in raft :)

RE: growing without netpots

Don't get me wrong. I don't use Rockwool, but a lot of people have problems with stem rot because rockwool holds so much water.
In a raft system, the rockwool will stay in contact with the water thereby always staying saturated.
with NFT, it depends on whether the rockwool contacts the flow or not. if it does, I would suspect he same problems, if not, then it probably wouldn't. I use net pot in nft and they don't touch the flow and the top hydroton never looks wet.

RE: growing without netpots

  • Posted by carb none (My Page) on
    Thu, Mar 14, 13 at 1:47

i see, do you think this also holds true with coco coir?

RE: growing without netpots

I imagine you would have the same problem. I've only used coir in an EnF though so don't know specifically about a raft. In the raft I made, I used hydroton.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Hydroponics Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here