GrodanRW108004 Rockwool, 50-Pack Macro Plant Plugs, Green

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.

Good product

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.

I like that these are round and have the slot on the side. Purchase some white kitchen string to tie around to keep the stem from drying out. Remember to soak in ph 5-6 r/o or distilled water works best. I would buy again.

Think about half or a little more were broken in half when they arrived.

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!

Still used but small