Grodan Rockwool Plant Plugs, Macro, 50-Pack

These feel solid compared to the cheap ones, they hold more air/ water. They are sterile as far as I can tell because they are reliable straight out of the box for hemp seeds.

I used these to start all my seeds. I used to use peat pots (Jiffy pots), but after learning about the over mining of peat for commercial sale that is damaging our natural forestation I switched and I'm glad I did. I also have a much higher success rate of germination using these compared to peat pots. They retain water longer, are pH neutral, sterile, and are organic.I also soak mine in warm water and gently squeeze them to loosen them up and break them in, rinse then soak again. If you soak them in tap water for best results let the tap water sit out for a 12-24 hours before soaking to let the chlorine and chemicals evaporate off.

Good - 100% success once I learned to use it.The slits make it easy to plant cuttings in the plugs.Like all rockwool, lots of air circulation, doesn't seem to ever rot.Bad - the slits open too far and the cutting can come out. Also, the slits seem to cover only part of the outside of the stem of the cutting. So, only that part touching the rockwool could grow good roots.My solution -- use a small rubber band. Once the cutting is in the rockwool, pull the band around the plug. Gets it nice and tight and keeps everything in place. When you plant the cutting later, the elastic band just rots.Which is more than I can say for the rockwool. It never rots. Even once planted. The rockwool is forever.Also, rockwool makes you itch if you touch it without gloves.

Good product

The Grodan 1.5" Macro plugs fit perfectly into the germinator that originally came with peat pellets. Clean, great packaging, prompt shipping! I believe there were a few extra included incase of damage or normal issues with rockwool (it can be delicate when dry). This is the first of these style rockwool that I have used, so far so good. If you have a peat pot style germinator, and are considering a change for germination, get THESE. Great Product!

I bought these along with some 2" net cups, hoping these would fit snugly inside of the cups. These are quite loose and I have to use small pebbles to take up the extra space. The product dimensions in the description only show the size of the full package (17.5 x 2.5 x 9.25 inches) and don't show the actual size of the individual rockwool plugs. Disappointed that they don't give the correct dimensions in the description. The products are good, if you don't want to use them in the net cups, like I wanted to.

Still used but small

Fist time user. I usually go for the rapid rooters but these surprised me.Mine were all intact and when soaked seemed to form around the stem with a light squeeze with no gaps.