Marijuana (Cannabis sativa)

Marijuana

Cannabis sativa

Its fibrous stems and resinous buds carry dual industrial and psychoactive roles. Annual herbaceous plant; common names: marijuana, hemp.

Full sun
2–3/week
Moderate
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Plant Needs

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Sunlight Requires 12+ hours of direct sunlight for flowering; 18 hours of light for vegetative growth; avoid prolonged shade as it stunts bud development
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Watering Water deeply when the top 5 cm of soil is dry; avoid overwatering to prevent root rot and fungal growth
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Temperature Thrives at 18–27°C; temperatures below 10°C will stunt growth and reduce bud production
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Characteristics

  • Leaf: Palmately compound with 5–11 serrated leaflets; bright green, fuzzy texture on undersides
  • Flower: Dioecious; female plants produce resinous buds with trichomes; male plants produce small, greenish flowers
  • Stem: Hollow, fibrous, rigid; covered in fine trichomes during flowering stage
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Horticulturist's Insider Field Notes (No AI Fluff)

The Golden 'Finger Test' Rule

Never water on a strict calendar. Stick your index finger 2 inches into the soil. If it feels cool and damp, wait 2–3 days. If bone dry, water thoroughly until it drains from the bottom holes.

Empty the Saucer After 20 Minutes

The #1 houseplant killer is water sitting in the catch tray. Stagnant runoff water starves roots of oxygen and causes root rot.

Turn the Pot Every 2 Weeks

Houseplants naturally lean toward the nearest window light. Give the pot a quarter-turn biweekly to maintain balanced, symmetrical architecture.

Wipe the Dust Away

Dust on leaves acts like a heavy sunshade. Gently wipe broad foliage with a damp cloth monthly to maximize photosynthesis and air purification.

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Care Guide

Watering

Keep soil consistently moist during vegetative growth; reduce watering slightly during flowering to encourage resin production

Fertilization

Feed with nitrogen-rich fertilizer every 2 weeks during vegetative growth. Avoid over-fertilizing to prevent nutrient burn and reduced resin production

Composted banana peel tea:Soak fully composted banana peels in water for 3 days; dilute 1:20 with water for root drench; avoid using raw peels to prevent odor and pest infestations
Pruning
  • Trim lower fan leaves during flowering to improve light penetration to bud sites
  • Remove male plants immediately upon identification to prevent pollination of female plants and seed production
  • Pinch vegetative tops during early growth to encourage bushy growth and increase bud yield
  • Remove yellowing or diseased leaves to maintain plant health and airflow
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Pet & Human Toxicity & Emergency Guide

⚠️ Toxic to Pets (Cats & Dogs)

Toxicity Warning: Veterinary toxicology registers Marijuana (Cannabis sativa) as possessing biochemical compounds (such as insoluble oxalates, alkaloids, or saponins) that pose ingestion hazards to felines and canines.

Feline Ingestion Risks (Cats)

Oral pain, hypersalivation (excessive drooling), pawing at mouth, swelling of tongue or lips, vocalization, and vomiting.

Canine Ingestion Risks (Dogs)

Oral mucosal irritation, gagging, retching, lack of appetite, lethargy, diarrhea, and difficulty swallowing.

Immediate Emergency First-Aid

Do NOT induce vomiting without veterinary instructions! Carefully remove remaining plant pieces, gently rinse mouth with cool water, and monitor breathing.

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Chewed leaf or stem? Open PlantFun App to scan the plant, immediately verify the botanical species, and view ASPCA toxicity severity ratings & vet first-aid advice.

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Troubleshooting & Common Plant Problems

Quick diagnostic guide for common care issues affecting Marijuana (Cannabis sativa):

Yellowing Leaves

Most commonly caused by overwatering or poor drainage. Ensure topsoil dries out between waterings and check for root ventilation.

Brown or Crispy Leaf Tips

Low ambient humidity, hard tap water minerals, or direct midday sunburn. Increase humidity and use filtered water.

Drooping or Wilting Foliage

Indicates dehydration or root damage from prolonged waterlogging. Inspect soil moisture and root firmness.

Common Pests (Spider Mites, Aphids)

Dry indoor air encourages pests. Wipe leaves with a damp cloth and treat with insecticidal soap or neem oil.

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Take a photo of any leaf on PlantFun App to get instant diagnosis of diseases, pests, and custom care recovery steps.

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Propagation & Repotting Guide

  • Taking Cuttings: During active spring or summer growth, take a healthy 4–6 inch cutting just below a node using clean shears.
  • Rooting Medium: Place cuttings in fresh water or moist perlite mix in bright, indirect light; refresh water weekly.
  • Potting Up: Transplant into well-draining potting mix once roots reach 2 inches in length (typically 3–5 weeks).
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Seasonal Care Calendar

  • Spring & Summer (Active Growth): Water thoroughly as topsoil dries; apply diluted balanced fertilizer monthly; encourage steady growth.
  • Autumn (Transition): Gradually reduce watering frequency as daylight hours shorten; discontinue fertilization.
  • Winter (Dormancy): Water sparingly only when soil is mostly dry; protect from cold window drafts; keep in warm room.
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Frequently Asked Questions

How often should I water my Marijuana?

Water thoroughly when the top 1–2 inches of soil feel dry. In active growth (spring/summer), water every 1–2 weeks; reduce significantly in winter.

Where is the best indoor location for Marijuana?

Position in bright, filtered indirect light (e.g., near an east or south-facing window with sheer curtains). Avoid harsh direct midday sun.

Is Marijuana toxic to pets?

ASPCA: Toxic; ingestion causes lethargy, vomiting, diarrhea, incoordination, and potentially seizures

When should I repot my Marijuana?

Repot every 1–2 years in spring when roots outgrow the drainage holes or the soil depletes nutrients.

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Garden Uses & Culture

Culture: Has historical use in textiles, medicine, and spiritual rituals; currently regulated for psychoactive properties in most regions

Usage: Industrial hemp for fiber, seed oil, and bioplastics; medicinal marijuana for pain and symptom management; recreational use in legal regions

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