I've used rockwool cubes for germination as well as clones, for soil as well as hydro grows. It actually helps support the plant untill it out grows the cubes. I recommend a 24 hour presoak of weak nute solution before using, although its not necessary. I've had a near 100% germing success with...
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"Mr. HIGHway's Cloning Method In Rockwool"
Contributed by: Mr. HIGHway
The first picture are the supplies needed. I use round RW cutting plugs with a slit down the side.
Items:
1: Rockwool cutting plugs.
2: Plastic tray with dome.
3: Sterile sharp scissors.
4: Rootech gel (comes...