Quick answer
A cannabis grow kit with seeds bundles the hardware a first-time grower needs, plus viable genetics. Kits usually include a light, a tent or cabinet, pots, growing medium, nutrients, a timer, and a small fan. The kit handles equipment. Your job is to manage light, water, temperature, and airflow, and to follow the home cultivation rules where you live.
Prerequisites
- Confirm that home cultivation and seed possession are legal in your state and city, and note the plant limit.
- Pick a room or closet with ventilation and a standard outlet for the timer.
- Decide between photoperiod and autoflowering seeds before you order.
- Get a thermometer and hygrometer if the kit does not include them.
What a good kit contains
- LED or compact fluorescent fixture sized to the tent footprint
- Timer for the light cycle
- Fabric pots or air pots with drainage
- Soil or coco coir medium
- Base nutrients plus a pH test kit
- Clip fan, exhaust fan, and carbon filter for odor
- Hygrometer for temperature and humidity
How to start seeds from a kit
- Set the tent or cabinet in its final spot and wipe the interior with a damp cloth.
- Fill each pot with the kit medium and water until it drains from the bottom.
- Plant each seed one quarter to one half inch deep and cover it with loose medium.
- Keep the medium between 70 and 80 degrees Fahrenheit until sprouts appear.
- Turn on the light when seedlings break the surface. Hang the fixture 18 to 24 inches above the canopy and run 18 hours on and 6 hours off for photoperiod plants, or 20 on and 4 off for autoflowers.
- Water a small circle around each stem when the top inch of medium feels dry.
- Start nutrients at one quarter of the label dose in week three, then raise the dose if leaves stay green.
- Log light height, temperature, humidity, and feeding once a week.
Choosing seeds for the kit
Photoperiod or autoflower
Photoperiod plants flower when you change the light schedule to 12 hours on and 12 off. You control the timing and usually get a larger yield. Autoflowers flower on their own after a set number of weeks, so they stay short and finish fast, which suits small tents.
Feminized or regular
Feminized seeds produce female plants almost every time, which saves space in a small kit. Regular seeds cost less per pack but roughly half become males that must be removed before they pollinate the females.
Traits to check
Look at expected height, flowering time, THC range, and mold resistance. Short, mold-resistant cultivars finish well in a 2 by 2 or 3 by 3 tent. Buy from breeders who publish test results.
Environment targets
- Seedlings: 60 to 70 percent humidity, 70 to 80 degrees Fahrenheit
- Vegetative stage: 40 to 60 percent humidity, 70 to 82 degrees Fahrenheit
- Flowering: 40 to 50 percent humidity, 68 to 78 degrees Fahrenheit
- Airflow: gentle breeze across the canopy, exhaust running 24 hours
Common mistakes
- Overwatering. Roots need oxygen, so let the top inch dry between waterings.
- Feeding too early. Seeds carry enough energy for the first two weeks.
- Hanging the light too close, which bleaches and curls leaves.
- Skipping airflow, which invites mold during flowering.
- Harvesting early. Check trichomes with a loupe and wait for cloudy heads.
Legal note
Hemp seed with 0.3 percent THC or less is legal at the federal level, but germinating cannabis seed is regulated by state law. Some states allow a set number of plants per household, others ban home growing outright. Check your state rules before you plant, and keep plants in a locked space if your state requires it.