How long does it take a cannabis clone to root?
A cannabis cutting typically develops visible roots in 7-14 days under proper environmental conditions: 75-80°F air temperature, 75-78°F medium temperature, 65-75% relative humidity, and 100-200 PPFD light intensity. Some cuts root in as little as 5-6 days; some can take up to 21 days depending on genetics, mother plant health, and environmental precision. If you're past day 21 with no visible roots, the cutting has almost certainly failed.
Shop HLVD-Tested Clones →Days 1-3: Callus formation
For the first 3 days after a cutting is taken, no visible activity happens above the medium. Below the surface, the cut stem is forming a protective callus — a layer of undifferentiated tissue that seals the wound and provides the base for root development. Disturbing the cutting during this phase (lifting it to check progress) interrupts callus formation and delays rooting. Resist the urge to inspect.
Days 4-7: Root primordia development
Tiny root initials form at the base of the cutting. These are not yet visible from outside the medium but represent the first stages of root development. Maintaining stable temperature and humidity during this phase is critical — large environmental swings can stall the process or kill the cutting outright.
Days 7-14: Visible root emergence
White root tips become visible at the bottom of the rooting medium. The first 1-2 roots usually emerge first, followed by additional roots over the next several days. By day 14, a healthy cutting should have 5+ visible root tips and be ready for transplant. Some cultivars (heavy Indicas, certain Kush varieties) root noticeably faster; some (long-flowering Sativas, certain landrace genetics) root noticeably slower.
What to do if rooting takes longer
If you're at day 14 with no visible roots, check temperature first (most common cause), humidity second, and rooting medium moisture third. A cutting that looks healthy above the medium but hasn't rooted by day 14 usually has one or more environmental conditions slightly off — bringing them into spec often produces roots within 3-5 days. If the cutting itself is starting to wilt, yellow, or droop by day 14, recovery is unlikely and the cutting should be replaced.
Faster rooting with hormones
Rooting hormone gel or powder applied to the cut stem before placing it in the medium can shorten rooting time by 2-4 days and increase success rate by 10-15%. IBA (indole-3-butyric acid) at 0.1-0.3% concentration is the standard for cannabis. Most quality rooting compounds at hydroponics retailers contain IBA. Apply lightly to the cut surface — heavy application can actually inhibit rooting rather than help it.
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