Deps is short for light deprivation. It is cannabis grown in sunlight, usually in a greenhouse or hoop house, where growers pull blackout covers over the plants to make the days shorter and start flowering early. So it isn’t simply another name for outdoor weed. The sun does the growing, and the grower controls the dark.

If you have seen “deps” on a menu or heard a grower talk about “pulling tarps,” this guide covers what it means and how it compares to indoor and outdoor flower. It also shows how to try a simple version at home, where home growing is legal.

What deps means and how light deprivation works

Cannabis is a short day plant. Utah State University Extension explains that cannabis “requires longer periods of darkness than daylight to flower,” so plants start to flower once the nights grow long enough. Outdoors, that happens naturally in late summer as the nights get longer. The plant takes those longer nights as a sign the season is ending, so it stops putting out leafy growth and starts making flowers.

Light deprivation copies that signal early. Growers cover the plants with a blackout tarp or curtain for part of each day, so the plants get a long, unbroken night even in the middle of summer. UF/IFAS Extension describes a flowering threshold for hemp that varies by cultivar, and conditions can affect timing. Once the day length the plant experiences drops below that point, flowering begins.

Leafly describes it this way: “Light deprivation is the technique, and greenhouses or crops that utilize it are called ‘light deps’ for short.” Over time growers shortened it again, and now the flower itself gets called deps.

Growers often call the daily routine “pulling tarps.” In the evening they pull the cover over the greenhouse or hoop house. In the morning they pull it back. A common example is about 12 hours of full darkness each day, but schedules vary by grower, strain and climate. The key is consistency. Light leaking in during the dark period can confuse the plant and slow or stall flowering.

Deps vs indoor vs outdoor

Deps sits between indoor and outdoor growing. It uses free sunlight like an outdoor garden, but it gives the grower some of the timing control of an indoor room. Many markets describe deps as “mixed light” cultivation, though how it is labeled depends on where you live.

	Indoor	Deps (light dep)	Outdoor
Light source	Grow lights	Sun, with blackout covers	Sun only
Control over timing	Full	Partial	Little
Harvest timing	Any time of year	Earlier than the natural season	Fall, set by the season
Running cost	Highest, mostly power	Middle, covers and labor	Lowest

Indoor growers control everything, including light, temperature and humidity, but they pay for it in electricity and equipment. Outdoor growers pay the least, but they get one harvest timed by the season and they take whatever the weather brings. Deps growers accept some weather risk in exchange for using the sun while still choosing when flowering starts.

Why growers use deps

The main reason is timing. By starting flowering early, a deps grower can harvest before the late season rain and cold arrive. In many parts of the US, fall weather brings moisture that can lead to mold in dense buds. An earlier harvest may dodge some of that. It can help with the weather, but it’s no guarantee.

Some growers also fit in a second run in the same season in some climates, though many growers don’t try it. After an early harvest, they plant again and use the covers to control the next flowering window. Results vary a lot with climate, strain and how carefully the schedule is kept, so a second harvest is something some growers manage, not something the method promises.

Deps can also make supply more steady for commercial farms. Instead of one big fall harvest, a farm can bring flower to market at different points in the year. For a home grower, the payoff is simpler. You get more say over when your plants finish, and that matters a lot if your area gets an early frost or a rainy autumn.

There are downsides. Pulling tarps is daily work, and a missed day can set the plants back. Covers also trap heat and humidity, so ventilation matters.

What deps means when you shop

If you see deps on a dispensary menu in a state where that is legal, it tells you how the flower was grown, not how good it is. Deps is not worse than indoor by default. Quality depends on the grower, the genetics, the drying and curing, and how fresh the product is.

Read the label for the strain name, the harvest or package date, and lab test results where your state requires them. Effects vary from person to person and from batch to batch, so the growing method alone will not tell you how a product will feel. Price is often between outdoor and indoor, because deps costs more to grow than plain outdoor but less than a powered indoor room.

How to try light dep at home

You can try a small scale version of light dep in a backyard, where home growing is legal in your state and area. Follow these steps.

1. Check your state and local home grow rules first.
2. Choose photoperiod seeds. Autoflowers flower by age and do not need light dep.
3. Set up a small hoop house or greenhouse frame that a blackout cover can fully enclose.
4. Cover the plants each evening and uncover each morning so they get about 12 hours of full darkness.
5. Keep the schedule every day with no light leaks until harvest.
6. Vent the cover on warm nights to limit heat and humidity under the tarp.

Start small. One or two plants under a simple frame will teach you more about timing, heat and airflow than a big setup ever could. Keep a notebook with the date you started covering, the times you pulled the tarp, and when you first saw flowers. If you want more basics before you start, our guide to growing a single plant at https://kindseed.com/grow-one-single-cannabis-plant/ walks through the essentials.

Troubleshooting

Most light dep problems come from light leaks, missed days or trapped heat and moisture. Use this table to match what you see with a likely cause.

Sign	Likely cause	What to do
Plants do not start flowering	Light leaks or missed cover days	Seal gaps and keep the same schedule every day
Buds show mold	Humid air trapped under the tarp	Vent at night and add airflow
Plants stretch or stall	Heat under the cover	Pull covers later in the evening or vent
Plant flowers then goes back to leafy growth	Schedule stopped too early in summer	Keep covering until harvest
Autoflower ignores the schedule	Autos flower by age	Use photoperiod seeds for deps

The most common mistake is stopping the covers too soon. In midsummer the natural days are still long, so if you stop covering, the plant can switch back to leafy growth. That is called reveg, and it costs weeks. Keep the routine going until harvest.

Mold is the second big risk. A closed tarp on a warm night holds moisture close to the buds. Open vents or a corner of the cover once the sun is down, and run a small fan if you have power nearby.

Photoperiod vs autoflower for deps

Light dep only works on photoperiod plants, because they flower in response to night length. Autoflower plants start flowering on their own based on age, usually a few weeks after they sprout, no matter how long the days are. Covering an autoflower won’t speed it up. It’s just extra work for nothing.

If you want an early outdoor harvest without daily tarp pulling, autoflowers are a simpler path. If you want control over a photoperiod strain, light dep is the tool. You can browse both types in the Kind Seed seed bank blog at https://kindseed.com/seed-bank-blog/ to learn more before you choose.

FAQ

What does deps mean in weed?

Deps is short for light deprivation. It describes cannabis grown in sunlight, usually in a greenhouse or hoop house, where the grower covers the plants with blackout tarps for part of each day. The longer nights trigger flowering earlier than the natural season would.

Are deps indoor or outdoor?

Deps is in between. The plants grow under the sun like an outdoor crop, but the grower controls when the dark period starts and ends, which is a kind of control usually linked with indoor rooms. Many markets call this mixed light growing.

Is deps weed worse than indoor?

Not by default. Quality depends on the grower, the genetics, and how the flower was dried, cured and stored. Some deps flower is excellent and some indoor flower is poor. Effects vary from person to person, so the growing method alone does not decide quality.

Can autoflowers be deps?

There is no need. Autoflowers start flowering based on age, not night length, so blackout covers do not change their timing. Light dep is meant for photoperiod plants, which wait for long nights before they flower.

Can I grow light dep at home?

Yes, where home growing is legal in your state and area. A small hoop house, a blackout cover and a steady daily schedule are enough to start. Cover the plants each evening, uncover them each morning, keep out light leaks and vent warm nights to limit mold.

Sources: Utah State University Extension, Ten Frequently Asked Questions About Growing Cannabis (https://extension.usu.edu/crops/research/ten-frequently-asked-questions-about-growing-cannabis). UF/IFAS Extension HS1452, Using Supplemental Lighting to Grow Hemp in Florida (https://ask.ifas.ufl.edu/publication/HS1452). Leafly cannabis glossary, light deprivation.