A cannabis harvest ripeness chart maps trichome head color to the plant's chemical stage. Clear heads mean the plant is still building cannabinoids, cloudy or milky heads mark the peak THC window, and amber heads show THC degrading toward CBN. Most charts place the target harvest at 70 to 90 percent cloudy trichomes with 5 to 15 percent amber, checked on the calyxes rather than the sugar leaves.
when to harvest cannabis plant
How do you read a cannabis harvest ripeness chart?
Read the chart left to right as a timeline, not as a single date. Each color band tells you what the resin is doing, and the percentage split tells you where in the window you are standing.
signs cannabis ready to harvest
The chart is a snapshot tool. You check it once every two or three days during the last two weeks of flower, not once at the end.
What do the trichome colors mean?
- Clear: Immature resin. THC is still forming, and the high tends to be weak, racy, or grassy.
- Cloudy or milky: Peak THC. This is the maximum psychoactive window for most cultivars.
- Amber: THC is oxidizing into CBN. Effects turn heavier, more body-focused, and more sedative.
- Mixed cloudy and amber: The balanced zone most growers target for a rounded effect.
- Brown, shrunken, or empty heads: Past peak. Potency drops and bud quality fades.
What percentage of amber trichomes should you aim for?
Amber percentage is the dial you turn to pick an effect, and the chart gives you the settings.
- 0 to 5 percent amber: Sharp, heady, energetic. Best for daytime use.
- 10 to 20 percent amber: Balanced head and body, the default for most harvests.
- 20 to 30 percent amber: Heavy, sedative, couch-lock leaning. Best for sleep and pain.
- Over 30 percent amber: Degradation outpaces production, and THC content falls.
Where on the plant should you check?
Look at the calyxes, the seed-pod-like clusters at the bud sites, because they ripen first and most accurately. Sugar leaves mature faster and will read amber while the bud is still clear, which is the most common chart-reading error.
Sample three spots: a top cola, a mid-branch bud, and a lower bud. Tops ripen first, so a staggered harvest is often the honest reading of the chart.
How has convenience changed harvest timing?
Convenience is now the deciding factor for many home growers, who harvest on a calendar instead of a chart. Breeder week counts, autoflowering fixed timelines, and single-day trim sessions all push growers to cut on schedule rather than on resin color.
That shortcut costs potency at both ends. Cutting early leaves clear trichomes and underweight cannabinoids, and waiting for a free weekend pushes the plant past peak into amber and CBN.
A trichome check takes about two minutes with a loupe and no lab time. It is the cheapest quality upgrade in the whole grow.
Which ripeness signals back up the chart?
Trichomes are the primary marker, but three secondary signals confirm it. Pistils darken, curl inward, and recede, usually at 70 to 90 percent darkened when the plant is ready. Calyxes swell and swallow the pistils, buds tighten, and water uptake drops off.
A 30x to 60x jeweler's loupe or a clip-on phone macro lens is enough to see head color. Check in natural light, never under blurple LEDs, which distort clear versus cloudy.
What does a quick ripeness chart look like by stage?
- Weeks 4 to 6 of flower: Clear heads, white pistils, no harvest.
- Weeks 6 to 8: Mostly cloudy, pistils beginning to curl. Start checking daily.
- Weeks 7 to 9: Cloudy with 5 to 15 percent amber. Prime window for most photoperiod cultivars.
- Weeks 9 to 11: 20 percent or more amber. Sedative profile, or past peak depending on the strain.
These ranges assume an 8 to 10 week photoperiod cultivar. Autoflowers and long-flowering sativas shift the whole chart earlier or later, so trust the resin, not the week number.