Quick answer: Growing cannabis at home takes a legal spot, a few healthy seeds or clones, the right light, decent soil, and steady attention. Expect about 3 to 5 months from seed to harvest, plus a few more weeks to dry and cure. Home growing is legal only in some states, so check your state’s rules before you do anything else.

Last updated: October 30, 2026.

Is home growing legal where you live?

This is the first question for a reason. The cultivation of marijuana is a state-by-state patchwork, and the rules swing widely. Some states let adults 21 and older grow a set number of plants. Some allow it only for registered medical patients. Others ban it for everyone.

A few examples show how different the rules can be:

• California: adults 21 and older can grow up to 6 plants per residence, and cities and counties can add their own rules.
• Virginia: adults 21 and older can grow up to 4 plants per household at their main home.
• Missouri: adults have to register with the state before they plant anything.
• Illinois: only registered medical patients can grow, with a limit of 5 plants taller than 5 inches.
• Washington: recreational users can’t grow at all. Registered patients can grow 6 plants, or up to 15 if authorized.
• New Jersey and Texas: no home growing, even for patients.

Home growing is also illegal under federal law, even in states that allow it. Recreational marijuana is still Schedule I. The April 2026 move to Schedule III covers state-licensed medical marijuana and FDA-approved products, not a plant in your closet.

Look up your state in our marijuana law guide and check the limits before buying anything. Pay attention to the details as well as the number. Many states require a locked, enclosed space out of public view, and many let landlords say no. Also confirm that you meet the rules for your state: adults 21 and older, or medical patients where state law allows.

New to cannabis in general? Start with Marijuana Beginner 101 and come back when you’re ready.

A typical grow timeline

These are typical ranges, not exact schedules. Genetics, your setup and the time of year all move the numbers around.

Stage	Typical length	What’s happening
Germination	1 to 7 days	The seed cracks and sends down a root
Seedling	2 to 3 weeks	First true leaves appear and roots get established
Vegetative	3 to 8 weeks	Fast leaf, stem and root growth
Flowering	8 to 11 weeks	Buds form, swell and ripen
Drying	1 to 2 weeks	Harvested plants slowly lose moisture
Curing	2 to 4 weeks or more	Moisture evens out in sealed containers

Indoor vs outdoor growing

Indoors, you’re in charge. You set the light hours, and you have much more control over temperature, humidity and pests. The tradeoffs are electricity, equipment and the need to manage heat and odor. If your state requires a locked space, indoors is often the simpler way to comply.

Outdoors, the sun does the work for free, but the weather makes the calls. Standard plants flower as the days get shorter, so an outdoor grow usually follows the seasons and finishes in fall. Wet autumn weather can bring mold, and you’ll have more bugs to deal with. Outdoor growing also isn’t allowed everywhere. Some states and cities require indoor grows or plants hidden from public view, so read your rules before you pick a sunny corner of the yard.

For most beginners in a legal state, a small indoor setup is the easier place to learn, simply because fewer things are out of your control.

Seeds vs clones

You can start from a seed or a clone, which is a cutting taken from a mother plant. Clones skip germination and copy the mother plant’s genetics, so you know what you’re getting. The catch is that a clone can bring along pests or disease from its source. Seeds start cleaner and are usually a better first choice if you can get them legally. Only use the sources your state allows, and don’t bring seeds or clones across state lines.

Photoperiod vs autoflower

This is the big decision, because it sets your whole schedule.

Photoperiod plants flower based on day length. Keep the light on long and they stay in vegetative growth. Shorten the day and they start to flower. You control how big they get, but you have to manage the light schedule carefully.

Autoflower plants don’t wait for a change in light. They flower based on age. That makes them forgiving and usually quicker, but they tend to stay smaller, and you can’t extend their growth if they get off to a slow start.

Feminized vs regular seeds

Cannabis usually grows as separate male and female plants, and the buds people want come from unpollinated females. Regular seeds can produce either sex, so you’d have to spot and remove the males before they release pollen. Otherwise your buds fill up with seeds. Feminized seeds are bred to produce female plants, which is why beginners with a tight plant limit tend to prefer them. They aren’t a guarantee, though, so keep checking your plants as flowering starts.

Keep in mind that every plant you sprout may count toward your limit, including any you plan to remove. Rules on how seedlings and immature plants count differ a lot by state.

What you need

You don’t need a fancy setup, but every grow has to cover the same basics:

• A secure space: somewhere you can lock if your state requires it, and out of reach of kids and pets. Many indoor growers use a tent. Our grow tent guide explains what to look for.
• Light: indoors, this matters more than almost anything else. See our beginner grow light guide for how to compare options.
• Air movement: a way to bring in fresh air, push out hot air and keep things moving around the plants. Some states expect you to control odor too.
• Containers and a growing mix: pots with drainage holes and a mix that lets roots breathe.
• Simple measuring tools: a way to check temperature, humidity and pH, plus a timer for the lights.

Treat electrical safety seriously. Keep cords and connections away from water, and don’t overload a circuit.

Germination

Germination is when a seed wakes up. It needs moisture, warmth, air and gentle handling. Hemp research is a useful guide here, since hemp and marijuana are the same species. Purdue University’s hemp program notes that soil should be at least 46 to 50°F and that temperatures above 86°F can reduce germination. University of Illinois Extension lists 66 to 77°F as the optimum air temperature for hemp.

Most home growers plant the seed directly in moist mix, roughly 1/4 to 1/2 inch deep. Going deeper makes it harder for the seedling to reach the surface and raises the risk of damping-off, a disease that kills young seedlings. Keep the mix damp but never soggy. In field hemp, germination can take only a day or two. Give yours up to a week before you worry.

Seedling stage

Your seedling first shows two small, round leaves, followed by the first true leaves with their familiar serrated edges. The plant is fragile here, and most problems come from doing too much. Skip the feeding, since a good mix usually has enough nutrients to start. Water lightly and keep the light gentle. In one study, researchers brought young plants up to full brightness gradually over about a week rather than all at once, and that’s a good habit to copy.

Vegetative stage

Once a plant has a few sets of true leaves, it takes off. This is the stage for building a sturdy frame of stems, leaves and roots. Water use goes up, and the plant may start wanting regular feeding. If it’s in a small pot, move it to a larger one before the roots run out of room.

With photoperiod plants, you decide when this stage ends. Plants keep growing for the first few weeks after the switch to flowering, so leave headroom between them and your light.

Flowering stage

Flowering is the home stretch. Plants stretch for the first few weeks, then shift their energy into forming buds. White pistils appear first, and those buds get thicker and denser as the weeks go on. Later, the pistils start turning a reddish-brown.

Watch closely in the early weeks. If you started with regular seeds, this is when male plants show themselves with small pollen sacs instead of pistils. Stressed female plants can occasionally do the same. Remove any that do so they can’t pollinate the rest. Air quality matters more now too, since dense buds are where mold likes to start.

Light cycles

Light hours are one of the few numbers in this hobby that researchers largely agree on. A 2024 study published in Plants explains that day lengths over 16 hours keep indoor cannabis in the vegetative stage. The same paper grew young plants at 18 hours of light and 6 hours of dark, then used about 12 hours of light to flower them, which is the indoor standard. That’s where the familiar 18/6 and 12/12 schedules come from.

Darkness needs to really be dark. Photoperiod plants measure the length of their uninterrupted night, and some cultivars respond to differences as small as 15 minutes, so a leaky tent or a light that’s turned on halfway through the night can confuse them. Use a timer rather than your memory.

Autoflowers don’t need the switch. Many growers keep them on one long-day schedule from start to finish.

Soil, nutrients and pH

Beginners do best with a quality potting mix that drains well. Purdue describes hemp’s preferred field soil as loose, well-aerated loam with plenty of organic matter and a pH of 6.0 to 7.5. Container mixes behave differently. Soilless mixes and coco are usually kept lower, around 5.5 to 6.5. Below about 5.5, research warns of manganese toxicity, and above 6.5, nutrients like phosphorus and iron become harder for plants to take up.

pH matters because it controls which nutrients a plant can use. A plant can be starving in a pot full of food if the pH is off. Check your water and your mix before you blame anything else.

For feeding, keep it simple. Plants generally want more nitrogen while they build leaves and stems. Many growers shift toward a bloom-style formula during flowering. Start at or below the label rate, and raise it only if the plant asks for more. Too much fertilizer does more damage than slightly too little, often showing up as burnt, crispy leaf tips.

Watering

More beginners hurt their plants with water than with neglect. Roots need air as well as moisture, and cannabis doesn’t like wet feet. Soggy mix also invites fungus gnats, whose larvae feed around the roots.

Skip the fixed schedule. Water when the top inch or so of the mix feels dry and the pot feels noticeably lighter when you lift it. Then water slowly until a little comes out the bottom, and empty the saucer so the pot isn’t sitting in a puddle. Plants drink more as they grow, as the room warms up and during flowering, so how often you water will change over time.

Temperature, humidity and airflow

Good news: if your space feels like a comfortable room, you’re close. Researchers measuring photosynthesis found the best temperature varied by variety, with most doing best around 77 to 86°F (25 to 30°C). In the 2024 Plants study, the chamber was held at a constant 77°F (25°C). Home growers usually aim for the 70s and let it stay a bit cooler at night.

Humidity needs more attention than most beginners give it. A 2025 study in Frontiers in Plant Science compared plants grown at 37 to 58% relative humidity with plants at 78 to 98%. The high-humidity group flowered about three weeks later, grew less, and had lower cannabinoid concentrations. That was one CBD-dominant strain, so treat it as a warning, not a precise target. As a common rule of thumb, growers keep things around 40 to 60%, moving toward the lower end late in flowering when buds are dense.

A gentle breeze through the plants keeps damp air from settling in and makes life harder for mold. Leaves should rustle a little, not whip around.

Pests and common beginner mistakes

Check your plants a couple of times a week, including under the leaves. A small magnifier and yellow sticky traps help you catch trouble early. The usual suspects:

• Spider mites: tiny specks, fine webbing and yellow or bronzed leaf spots. They love hot, dry conditions.
• Aphids: small soft insects that leave sticky honeydew on leaves.
• Fungus gnats: small flies that resemble mosquitoes, usually a sign the mix stays too wet.
• Powdery mildew: white, flour-like patches on leaves. Avoid high humidity and big temperature swings, and space plants for better airflow.
• Bud rot: gray or brown mush inside dense buds. Cut out affected flowers and throw them away. Don’t try to save them.

If you treat a problem, use only products labeled for that use and allowed in your state, and be especially careful late in flowering. It’s a plant you may consume, so anything you spray can stay on it.

The classic beginner mistakes are a short list:

• Buying gear before checking the legal limits
• Overwatering
• Overfeeding at the first sign of a yellow leaf
• Ignoring pH
• Letting light into the dark period
• Crowding too many plants into too little space
• Harvesting early out of impatience

Harvest timing

The calendar gives you a rough idea, but the plant has the final say. The best tool is a jeweler’s loupe or small pocket microscope, because you want to look at the trichomes, the tiny resin glands covering the buds.

Researchers at the University of Guelph tracked this across a full life cycle and saw trichome heads shift from clear to milky white and finally to amber as flowers matured. That color change is your harvest clock:

• Mostly clear: too early. Keep waiting.
• Mostly milky: the window many growers aim for.
• Milky with some amber: also a common choice, and later in the window.

There’s no peer-reviewed percentage that fits every plant, so treat this as a grower’s rule of thumb. Look at the buds themselves rather than the small sugar leaves, which tend to change first. Pistils give you a second clue. In the 2024 Plants study, researchers began harvesting once more than 95% of the pistils on the top bud had turned brown. That was a research trial, not a universal rule.

Drying and curing

Rushed drying can undo months of careful growing.

Drying: Cut plants or branches, remove the large leaves if you like, and hang them in a dark, ventilated space. In a Cornell paper in Plants, researchers describe conventional hemp drying at about 59 to 68°F (15 to 20°C) and 50 to 60% relative humidity, usually taking 1 to 2 weeks. Too warm or too dry and the outside dries before the inside. Too damp and mold becomes a risk. A common test is that small stems snap rather than bend.

Trimming: Trim the leaves close to the buds either before or after drying. Scissors work fine for a small grow. If you’d like a hand tool, our leaf bowl trimmer guide covers how they compare.

Curing: Put the dried buds in clean, airtight glass jars, filled loosely, and keep them somewhere cool and dark. Many growers open the jars briefly each day for the first week or two to let moisture escape. The Cornell team cured in glass jars in the dark for 3 weeks and favored glass for keeping quality, and it cites earlier work that found good results at about 64°F (18°C) and 60% humidity. If you see mold or smell ammonia, something stayed too wet. Throw out moldy buds.

Store your finished harvest locked up and away from anyone under 21, and check your state’s rule on how much you can keep at home.

Marijuana cultivation FAQ

How long does it take to grow cannabis at home?

Plan on about 3 to 5 months from seed to harvest, depending on the plant type and how long you keep it in the vegetative stage. Drying and curing add at least a few more weeks. Autoflowers are usually on the quicker end, and a slow start can stretch any timeline.

How many plants can I grow at home?

That depends entirely on your state, and the answer may be zero. Limits run from no plants at all to a set number per adult or per household, and some states allow it only for registered medical patients. Check your state in our marijuana law guide before you start.

What’s the easiest way for a beginner to start?

If growing is legal for you, a small indoor grow with one or two plants is a good way to learn. Feminized or autoflower seeds, a quality potting mix and a simple light schedule cut down on the decisions you have to make early on.

What’s the best pH for growing cannabis?

Field soil research on hemp points to a pH of about 6.0 to 7.5, while soilless mixes are usually kept around 5.5 to 6.5. Check the pH of your water and growing mix regularly, because the wrong pH can block nutrients even when plenty are present.

Can I sell or share what I grow?

Don’t sell it. Selling cannabis without a state license is illegal, even where home growing is allowed. Gifting rules vary by state, and some states limit it closely, so check yours first. Never take any across state lines.

One last thing before you plant: stay within your state’s plant limit, and count every plant the way your state’s law counts it.