Cloning & Propagation Supplies for Indoor Growing
Propagation is the foundational stage of every growing cycle -- the period when new plants are established from seed germination or vegetative cuttings before entering the main production environment. Getting propagation right sets the trajectory for the entire crop: well-rooted, vigorous transplants establish quickly and grow evenly; stressed, poorly rooted transplants lag behind schedule and rarely fully recover their lost potential. The right combination of propagation format (aeroponic cloner, humidity dome and tray, or rockwool cube program), starter medium, rooting hormone, and environmental conditions (temperature, humidity, gentle light) produces the consistent, high-quality transplants that commercial and serious hobby growing programs depend on.
Propagation Methods
Aeroponic cloning machines mist cutting stems continuously with oxygenated water, producing roots in 5-14 days with high success rates -- the commercial standard for rapid, high-volume cutting propagation. Humidity dome and tray systems with starter cubes (rockwool, rapid rooter, or coco plugs) provide a simpler, lower-cost propagation format suited to smaller operations and seed starting. DWC bubble cloners submerge cutting stems in aerated water for root development -- similar speed to aeroponic systems with a simpler mechanism. Seed starting in cell trays with starter plugs or peat pots is the standard path for annual vegetable and herb production where genetic diversity from seed is the goal rather than vegetative cloning. Browse all propagation categories in our propagation hub.
Key Success Factors
Temperature (70-80 degrees F substrate temperature), high humidity (80-95% RH under dome), low light intensity (100-250 umol/m2/s), and sterile technique are the four variables that determine propagation success rate. Rooting hormone (IBA gel or powder) applied to cutting ends accelerates root initiation. Fast shipping.
Cloning & Propagation FAQ
What is the fastest way to root cuttings?
Aeroponic cloning machines produce the fastest roots in most species -- cuttings misted with oxygenated water at the stem end typically root in 5-10 days with high success rates. The continuous moisture and oxygen at the cut surface maximizes callus formation speed and root emergence rate. Rockwool and rapid rooter plugs under a humidity dome produce roots in 7-14 days -- slightly slower than aeroponic but simpler to operate and requiring no machine maintenance. The most important single factor regardless of method: cutting quality from a healthy, vigorous mother plant that is well-fed and not under any stress at the time cuttings are taken.
What is IBA rooting hormone and do I need it?
IBA (indole-3-butyric acid) is a synthetic auxin that stimulates root initiation when applied to the cut end of a cutting. It increases rooting success rate and speeds root emergence compared to untreated cuttings. Gel formulations are the most user-friendly -- dip the fresh cut end, coat evenly, insert into the propagation medium. Powder formulations require a moist stem to adhere. IBA is not strictly required (some species root readily without it) but increases consistency, particularly for difficult-to-root species and for operations where high cutting success rate is economically important.
What temperature should I maintain for propagation?
Target substrate temperature of 72-78 degrees F for most species during propagation. Substrate temperature drives root initiation speed -- below 65 degrees F, rooting slows significantly; above 82 degrees F, the risk of pathogen issues (Pythium, bacterial rot at the cut end) increases. A seedling heat mat under the propagation tray maintains substrate temperature independently of ambient room temperature, which is particularly important in cold growing spaces in winter. Ambient air temperature inside the humidity dome should be 68-75 degrees F; the dome traps warmth from the heat mat.
How do I prevent damping off in seedlings?
Damping off (fungal stem rot at the substrate surface, caused primarily by Pythium and Fusarium species) is the most common seedling propagation failure. Prevention: use sterile propagation media (new starter plugs or fresh coco, never reused media); avoid overwatering (the single biggest damping off risk factor -- media should be moist but never waterlogged); maintain adequate air circulation under the dome (partially open dome vents after germination to prevent stagnant humid conditions); use a dilute hydrogen peroxide or beneficial bacteria drench (Bacillus subtilis) at the first watering after germination as a preventive treatment; and avoid cold, wet substrate conditions by using a heat mat.
Can I use any grow light for propagation?
Propagation requires low-intensity light -- 100-250 umol/m2/s for seedlings and fresh cuttings. High-intensity production lights at full power cause photoinhibition and wilting stress in young tissue that has not yet developed the photoprotective systems of mature plants. T5 HO fluorescent fixtures at 4-6 inch distance, small LED bar arrays at 12-18 inch distance at 20-50% power, or purpose-made clone and seedling LED lights are the appropriate light sources for propagation. Transitioning plants from propagation light levels to production light levels should be done gradually over 5-7 days to allow photoadaptation.
