When is cannabis ready to harvest? It’s ready when most of the trichomes on the buds have turned cloudy or milky, a portion have started to go amber, and most of the pistils have darkened and curled back into the calyx. Many growers cut when the heads are mostly cloudy with roughly 10 to 30% amber. Check with a 60x loupe or pocket scope, and look at the buds themselves, not the sugar leaves.
The breeder’s flowering time on the seed pack gets you into the right week. It doesn’t tell you the right day. Two plants of the same strain in the same room can finish days apart, so the plant itself has the final say. If you’re still dialing in your bloom feed for those last weeks, our guide to fertilizer for the flowering stage covers what the plant needs late in flower, and our guide to the best bloom boosters covers the products growers reach for in those final weeks.
How to tell when weed is ready to harvest
There are two signs worth trusting: trichome color and pistil color. Trichomes are the more accurate of the two, and they’re the one we lean on. Pistils are a good early warning that you’re getting close.
What you need
- A jeweler’s loupe or handheld scope with about 60x magnification. A clip-on phone macro lens works too if it’s sharp enough to see individual heads.
- Good light. Turn off colored grow lights or pull a bud sample under white light so you see true color.
- Patience. Check every day or two once you’re in the final stretch, because the window can move quickly.
Trichomes ready to harvest: reading the colors
Trichomes are the tiny resin glands that cover the buds. They hold the cannabinoids and terpenes, and the little round heads on top change color as the plant matures. This trichome harvest chart sums up what each stage means:
| Trichome color | What it means | What to do |
|---|---|---|
| Clear (glassy) | Immature. Resin is still developing. | Wait. Harvesting now gives a weaker, less finished result. |
| Cloudy (milky) | Peak THC. The heads look like frosted glass. | The harvest window is open. Mostly cloudy is the most common target. |
| Amber (gold) | THC is starting to break down. Effect leans more sedating and body-heavy. | Many growers cut with 10 to 30% amber. More amber means a heavier effect. |
There’s no single correct ratio. If you want a brighter, more up effect, harvest when the heads are mostly cloudy with very little amber. If you prefer a heavier, couch-lock style effect, let more of them turn amber before you cut.
Check the buds, not the sugar leaves
This is the most common mistake we see. The small sugar leaves poking out of the buds often turn amber well before the calyxes do. If you judge by them, you’ll think the plant is ready and cut too early. Look at the trichomes sitting directly on the calyxes, and sample buds from the top, middle and lower parts of the plant. Top colas usually finish first.
Reading pistils for harvest readiness
Pistils are the hair-like strands coming out of the buds. Early in flower they’re white and stick straight out. As the plant matures they darken to orange, red or brown and curl back in toward the bud.
When roughly 70 to 90% of the pistils have darkened and curled in, you’re close. Use that as your cue to get the loupe out and start checking trichomes daily. Pistils alone can mislead you. Heat, light stress or a big swing in humidity can make them change color early, and some strains keep pushing fresh white hairs right up to the end.
Breeder flowering time is only a guide
An “8 to 9 week” strain might be ready at week 8 in one room and week 10 in another. Light intensity, temperature, feed and genetics all shift the finish. Count weeks from the flip so you know when to start watching, then let the trichomes decide.
Autoflowers work the same way. They follow a rough seed-to-harvest schedule instead of a light change, but you read them by trichomes and pistils just like a photoperiod plant.
Signs your cannabis is overdue
- A large share of the trichomes are amber and some heads look shriveled or are falling off.
- Nearly every pistil is dark and the buds have stopped swelling.
- Fan leaves are yellowing hard across the whole plant, beyond the normal late-flower fade.
- The aroma has gone flat or hay-like instead of loud and sharp.
Fading leaves in the last two weeks are normal as the plant pulls stored nutrients. Heavy yellowing earlier in flower is a different story. Our pages on nitrogen deficiency and potassium deficiency help you tell the difference.
Waiting too long also gives mold more time to take hold in dense colas. While you check trichomes, look over the buds and sugar leaves for any white, dusty film. If you spot it, read our guide to powdery mildew on cannabis before you decide how to handle the harvest.
Should you flush before harvest?
Growers don’t agree on this one. Some run plain water for the last week or two and say it gives a cleaner smoke. Others feed through to the end and say a good dry and cure matters far more. We cover both sides in flushing cannabis plants with the Garden Sage. Whatever you choose, don’t let it distract you from the trichomes. They tell you when to cut.
Cannabis harvest time: after the chop
Harvest timing is only half the result. How you dry and cure decides how much of that resin and aroma you keep. Hang the branches in a dark room with gentle air movement and steady, moderate temperature and humidity until the small stems snap instead of bending. Then jar the buds and burp the jars as they cure over the following weeks.
Decide early whether you’ll trim before or after drying. Our breakdown of wet trim vs dry trim walks through the tradeoffs, and trimming closer for bigger flowers covers technique.
Frequently asked questions about when cannabis is ready to harvest
Is it ready to harvest if the pistils are orange?
Orange pistils mean you’re getting close, but they aren’t enough on their own. When most of them have darkened and curled in, start checking the trichomes on the buds with a loupe. Harvest when the heads are mostly cloudy with the amount of amber you want.
What do trichomes look like when ready to harvest?
Under 60x magnification, ready trichomes have milky, frosted heads instead of clear, glassy ones. A share of them will have turned amber. Many growers cut at mostly cloudy with about 10 to 30% amber.
Why are my sugar leaves amber but the buds aren’t?
Sugar leaf trichomes often turn amber earlier than the ones on the calyxes. They aren’t a reliable gauge. Always judge readiness by the trichomes sitting directly on the buds.
How long after pistils turn brown should I harvest?
There’s no fixed number of days. Brown pistils tell you to start watching the trichomes every day or two. The timing depends on when the heads reach the cloudy and amber balance you’re after.
Can you harvest cannabis too early?
Yes. Cutting while most trichomes are still clear gives smaller, less finished buds with a thinner, weaker effect. If you’re unsure, waiting a few more days is usually the safer call.
We post more garden walkthroughs on the Growing Exposed YouTube channel.
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Members get the full Growing Exposed video library, where we walk through real gardens from flip to chop, including how experienced growers read their plants before harvest. You can also post bud and trichome photos in the Growing Exposed forums and get a second opinion before you cut. See membership plans.
