Story and Photos by Ed Borg

If you’re having difficulties maintaining a high level of successfully rooted clones, I suggest the inexpensive and foolproof procedure developed by Amsterdam’s Delta-9 Labs. The cloning process revealed here was achieved using rockwool cubes; however, soil, perlite or coco mediums work equally well.

Humidity, as we all know, plays a vital role in developing healthy rooted clones. If the humidity level fluctuates even by as little as 10%, it could result in cuttings failing to develop properly, which may eventually cause them to wilt, mold or die. Maintaining a rather high humidity (75–85%) for the first three days is absolutely vital to the cuttings’ success.

It is recommended (and thus assumed for the purposes of this article) that your cloning area is equipped with fluorescent lights (known in parts of Europe as TL lights). High-intensity discharge lighting (HID) is unnecessary when dealing with sensitive clones: They simply can’t handle such intense light at this young and fragile stage of existence. Fluorescents provide enough light to root clones without the dry heat typical of high-pressure sodium (HPS) or metal-halide (MH) lighting as well.

The process begins with the preparation of the medium in which you intend to clone. We use rockwool cubes for their ease and convenience; however, this is a matter of personal preference.