I did a staggered harvest on my last grow. It worked great. I was running GMO Cookies. A long flowering strain that tends to swell late. And I've also heard the long flowering strains benefit the most from this practice.
If you are shooting for maximum thc and head high then you want to do exactly as you're thinking. If you let the tops go longer you'll get more amber trichomes, thus more CBN, and have more of a sedative couch lock experience the longer you let the tops ride. I may do a staggered harvest again on this grow. I'm basically having the same issue as you right now. I have 3' of canopy in a 4x4 area, with four plants, and a whole lot of tops and a thick canopy no matter how much thinning I do, producing substantial amounts of mids and lows too, but the mids and lows just aren't quite where the tops are. So if I did a whole plant harvest I'd get a different effect from the lower section than the top and I'd also be sacrificing some volume and potency on the mids and lows. But the harvest would be easier. So long story short, staggered harvests work great. But they take extra work.
You are right in your sweet spot for those top buds. An extra 1-3 days right now is not going to ruin them but you are in the harvest window for those uppers based on the effects you're wanting. I wouldn't let them go longer than that before giving them 48 hrs of darkness. Most of my info comes from research. I only have three grows under my belt. But I do read like crazy. And my grow diary shows I'm getting decent results using what I've learned.
Why Do a Staggered Harvest?
A staggered harvest lets you take the
top colas first when they’re at
peak THC and potency, while giving
lower buds more time to ripen. Tops mature faster because they get more light and airflow. Harvesting in stages helps you
maximize THC and head high effects by cutting each part of the plant at its perfect moment.
Quick Directions:
- Cut top buds when trichomes are mostly cloudy with a few ambers.
- Leave mids/lowers on the plant, lower the light slightly, and continue with plain water or cold flush.
- Check trichomes again in 5–7 days, then harvest the rest when they’re mostly cloudy.