Cannabis Growing Stages: Autoflower & Photoperiod Timelines

Cannabis growth moves through germination, seedling development, vegetative growth, flowering and harvest, followed by drying and curing. Autoflowers progress toward flowering with maturity; photoperiod plants respond to day length. A useful timeline therefore identifies the seed format and the starting point of each timing label, rather than assigning every plant the same harvest week.

Use this guide alongside our indoor cultivation masterclass. Where cultivation is legal, keep a dated record of germination, emergence, first flowers and harvest assessment so you can compare the plant with its own breeder information.

Autoflower vs photoperiod timelines

A photoperiod grow includes a vegetative period whose length depends on the light environment and cultivation plan. An autoflower does not need a switch to a short-day schedule to begin its reproductive development. The 2023 review of cannabis flowering genetics describes maturity-driven flowering in autoflower varieties and substantial variation between genotypes.

Flowering behaviour and seed sex are separate traits: a feminised pack is not automatically photoperiod. Our seed format comparison explains those labels; the autoflower seed collection lets you compare individual breeder profiles.

Germination and seedling development

Track germination separately from the day a shoot emerges. Early development includes the opening of seed leaves, followed by serrated true leaves. A small seedling and an established plant are different developmental stages, even if their calendar ages are close. The seedling phase is not a deadline that every cultivar reaches on the same day.

Royal Queen Seeds describes an approximate one-to-two-week seedling phase in its autoflower overview. Treat that as breeder guidance, not a universal milestone. Record visible leaf development alongside the date.

Vegetative growth and pre-flowering signs

Vegetative growth builds the plant's leaf and branch structure. In photoperiod plants, solitary flowers can appear before the main flowering canopy develops. A 2019 study of female cannabis architecture distinguishes these early flowers from the condensed inflorescences associated with shorter photoperiods. One pair of visible stigmas is therefore not a reliable start date for every breeder's flowering estimate.

For autoflowers, vegetative growth and early reproductive development can overlap. Keep notes on new growth and developing flower sites instead of declaring the vegetative stage finished at a fixed week. Our cannabis plant training guide provides the separate context for canopy decisions.

An approximate autoflower week-by-week timeline

The following checkpoints are a planning example, not a feeding schedule or a promise. Royal Queen Seeds outlines roughly one to two weeks of seedling development, followed by another two to three weeks of vegetative development; its flowering duration varies by cultivar. These phases can overlap and should not be added as rigid deadlines.

• Early weeks: note emergence and the development of true leaves.
• Around weeks three to five: compare branch growth and the first flower sites with the breeder's description; some plants develop earlier or later.
• Following weeks: record expanding flower clusters and changing resin-gland appearance. Count flowering separately if the breeder uses that label.
• Near the breeder's estimated finish: assess maturity rather than harvesting solely because a calendar week has arrived.

Timing varies even within one breeder's range. Dutch Passion's seed-to-harvest overview lists Auto Blueberry at eight to ten weeks and Auto Desfran at twelve to fifteen weeks. Its Auto Think Big product page describes approximately eleven to thirteen weeks from seed to harvest. These are named breeder examples checked on 11 October 2026, not timing assigned to every autoflower.

Flowering duration is not the full lifecycle

Seed-to-harvest time includes early development; flowering time covers a later part of the lifecycle. Read the breeder's definition before comparing two packs. A flowering estimate does not establish how long a photoperiod plant spent in vegetative growth, and neither label includes post-harvest drying and curing unless explicitly stated.

For photoperiod plants, shorter days influence the development of the flowering canopy. Autoflowers should not be assigned the same light-triggered start date. For equipment context rather than a universal intensity recipe, see our grow light selection guide.

Harvest assessment, drying and curing

A breeder's harvest estimate is a checkpoint, not an instruction to cut on that date. Compare flower development and resin-gland appearance across the plant. The 2021 review of cannabis glandular trichomes explains their role in producing and storing metabolites; visual appearance is not a laboratory measurement of cannabinoid concentration or a guarantee of a particular effect.

Drying and curing happen after harvest and need their own record. They should not be hidden inside a seed-to-harvest estimate. For the next stage, read our harvest, drying and curing guide. This timeline does not prescribe one drying duration or humidity setting for every batch.