Quick answer: light deprivation, often called depping, uses blackout tarps over a greenhouse to artificially shorten the light a cannabis plant receives, tricking it into flowering months before the natural fall season would trigger it. Farms use it mainly for two reasons: some cultivars have flowering cycles long enough that a natural season would push their finish date past reliable fall weather, and staggering harvest timing lets each plant be cut at genuine peak readiness instead of the whole crop competing for attention and drying room space all at once.
At Sol Spirit Farm in Trinity County, depping is a selective timing tool inside a regenerative Sun Grown system. This article explains what light deprivation is, how the tarp process works, why farms use it, why every cultivar does not get depped, and what makes Sol Spirit’s in ground approach different.
Cannabis is photoperiod sensitive. It flowers in response to shortening day length, which is why outdoor cannabis has traditionally been a fall harvest. Light deprivation covers the plants with blackout tarps on a strict daily schedule, artificially shortening the day even in the middle of summer. The plant reads that as the season changing early, and responds by flowering.
Tarps go over a greenhouse structure and get pulled closed and opened on a fixed daily schedule, simulating a twelve hours light and twelve hours dark cycle regardless of the actual season outside. No chemicals, no genetic modification. The mechanism is entirely about controlling one input the plant already responds to naturally.
Consistency matters. Light leaks, slipped schedules, or stressed plants can cause uneven flowering. Selective depping only works when crew discipline matches the tarp hardware.
Two reasons matter most. First, some cultivars have flowering cycles long enough that a full natural season would push their finish date past the point where fall weather is still reliably cooperating. Depping lets those genetics reach maturity while conditions are still good, instead of gambling on late season weather.
Second, and just as important: spacing harvest out over several weeks, instead of the entire crop finishing at once, lets each plant get cut at its actual peak of readiness. A full term harvest often means everything is ready in a narrow window, which creates real time and space pressure in the field, in handling, and in the drying room, right when bad fall weather is also most likely. That crunch, more than almost anything else, is where quality gets lost at harvest. A steadier, staggered workflow protects against it at every step.
Some varieties are bred for, and genuinely benefit from, the full natural season, more time to develop structure, terpene complexity, and yield. Forcing an early flip on the wrong genetics usually means smaller plants and less developed flower. The decision comes down to each cultivar’s actual growth pattern, not a blanket rule. How we match genetics to dep or full term is covered in how we decide which cultivars get light deprivation.
Most light deprived cannabis is grown in plastic pots filled with commercial potting soil, a practical setup for portability and control, but one that disconnects the plant from any living soil ecosystem beneath it. Our depped cultivars grow directly in the ground, in native soil we have spent over two decades building.
That distinction matters more than it might seem. Mycorrhizal fungi form an active relationship between a plant’s root system and the surrounding soil biology, and that relationship contributes meaningfully to the flavor and character of the finished flower. In ground depping is harder to manage than potted depping. The plants cannot be moved, and the whole setup has to work around the land rather than around convenience. It is also a real part of why we took First Place in the Certified Sun Grown category at the 2023 Emerald Cup, and Second Place in the same category in 2024.
We also do not dep purely to chase market timing. If conditions genuinely favor letting a cultivar run its full natural season, that is what happens. The goal is quality and working with what the land and weather actually allow, not maximizing output or hitting a calendar date. Soil context for that stance is explained in what regenerative farming actually means and on our regenerative farming practices page.
Does light deprivation affect cannabis quality. Not inherently. It is a timing tool, not a shortcut. Quality depends on whether the specific cultivar responds well to an early flip. The wrong genetics under a tarp can lose quality. The right genetics under a tarp perform just as well as they would on a natural timeline, just sooner.
Is depped cannabis different from full term cannabis. Both can be high quality. The difference is timing and, for some cultivars, subtle differences in structure or expression. Neither is categorically better. It depends on what a specific genetic was bred to do.
Why do not all farms use light deprivation. It requires greenhouse infrastructure and daily tarp management, and it only benefits cultivars suited to an early flip. Farms that grow primarily full term genetics, or lack the structures for it, often skip it entirely.
Is depped cannabis usually grown in the ground or in pots. Most commercial light deprivation setups use plastic pots with commercial potting soil, since it is easier to manage. Growing depped cultivars directly in living native soil is less common. It is harder to manage but preserves the plant’s connection to soil biology, which meaningfully affects the flavor of the finished flower.
This farm runs both systems. Certain cultivars go under the tarp for an earlier, deliberate harvest, while others grow on nature’s own calendar into the fall. Unlike most depped cannabis, ours grows in the ground the whole way through, not in pots, a harder path that we take because of what it does for the flower. Curious which of our current cultivars are running dep versus full term this year. We will share that as harvest gets closer. Collective members get access to our complete current menu, not filtered down to whatever a retail buyer decided to stock that month. Join at solspiritfarm.com/collective.
Explore flower education through organic cannabis flower strains, farm story on about us, wholesale paths via wholesale, and questions through contact us. Propagation timing that starts next year’s crop is covered in mother plant selection.
Sol Spirit Farm, Trinity County. Sungrown, regenerative, farmed with twenty two years of judgment about when to follow the season and when to work it.
Daily tarp pulls are physical work. Selective schedules respect crew energy and reduce error. Fewer, better matched dep cycles beat covering everything because a calendar looks aggressive. Discipline is part of quality.
Drying room capacity is planned before covers start. An earlier finish only helps if post harvest space is ready. Staggering harvest is a whole farm design, not only a greenhouse trick.
Consumers can ask retailers whether early Sun Grown lots were matched genetics under tarps or rushed plants under pressure. At Sol Spirit, depping exists to protect long flowering cultivars and craft handling, while full term lots keep the whole natural season when the microclimate allows.
In ground living soil under depped canopies is the first thing we want people to understand about our approach. The tarp changes day length. The soil still grows the character.
In ground living soil under depped canopies is the first distinction we want people to understand. The tarp changes day length. The soil still grows the character of the flower.
Market timing alone is never enough reason to pull covers. If the land and weather favor a full natural season for a cultivar, that cultivar stays full term.
In ground living soil under depped canopies is the first distinction we want people to understand. The tarp changes day length. The soil still grows the character of the flower.
Market timing alone is never enough reason to pull covers. If the land and weather favor a full natural season for a cultivar, that cultivar stays full term.
In ground living soil under depped canopies is the first distinction we want people to understand. The tarp changes day length. The soil still grows the character of the flower.
Market timing alone is never enough reason to pull covers. If the land and weather favor a full natural season for a cultivar, that cultivar stays full term.
In ground living soil under depped canopies is the first distinction we want people to understand. The tarp changes day length. The soil still grows the character of the flower.
Market timing alone is never enough reason to pull covers. If the land and weather favor a full natural season for a cultivar, that cultivar stays full term.