Cultiwool Rockwool Block 4x4x4cm – Propagation Cube for Seeds and Cuttings

Frequently asked questions

• What is the 4x4x4 rockwool block for?

  It is a rooting medium with a porous structure that holds both plenty of water and plenty of air, ideal for starting your seeds or rooting cuttings. Once the plant has rooted, the block is transplanted into a rockwool slab to carry on the grow.

• Do I need to adjust the pH before using it?

  Yes, it is the most important step. Rockwool comes with a very high pH by default, so you will need to bring it down to 5.5 by soaking the block for 24 hours in water already adjusted to that value. If you skip this step, the young roots will feel it.

• How do I place the seed or cutting in the block?

  With the medium already prepared, place the seed or push the cutting in firmly so it does not move. Both need to end up inserted in the middle of the block so they root perfectly. Keep an eye on moisture, pH and depth so the seed does not rot.

• How do I get rid of excess water without damaging the block?

  Rockwool repels excess water on its own, so all it needs is a gentle shake. There is no need to squeeze the block, and in fact it is better not to, so you do not compromise its porous structure.

• Can I use fertilisers with these blocks?

  Yes, it is a product that takes fertilisers to help the roots develop properly. Being an inert medium, you are the one in full control of what the plant receives.

• Is the Cultiwool block sold individually or in a pack?

  This product is sold as individual units, so you can order exactly the number you need for your propagation. In stock, orders placed before 2:00 p.m. ship the same business day and arrive 1 to 3 business days later; you'll see the estimated delivery date on the product page. You have 30 days for an easy return if something does not fit.