🌾 Rice

Oryza sativa (Asian rice), O. glaberrima (African rice)

grains annual

☀️ Sun

full sun

💧 Water

very high (paddy), moderate (upland)

🗺️ Zones

6-10 (as annual)

🪴 Soil Type

clay, clay loam (paddy); loamy (upland)

🧪 Soil pH

5.0-7.5

💧 Drainage

poor (paddy requires flooded conditions), well-drained (upland rice)

📏 Spacing

4-8 inches (transplanted), broadcast (paddy)

📐 Height

3-6 feet

📅 Days to Maturity

90-180 days (depending on variety)

🍴 Edible Parts

🍽️ seeds (grain)🍽️ bran (for oil)

🤝 Companions (11)

🤝 Azolla (aquatic fern)

Azolla is a traditional green manure for rice paddies — it fixes nitrogen and is incorporated into the soil before rice planting

🤝 Duck (integrated farming)

Ducks in rice paddies control weeds, eat insect pests, and provide fertilizer without harming rice plants — the traditional aigamo method in Japan

🤝 Fish (carp, tilapia)

Fish stocked in paddies control weeds and pests, provide additional protein, and their waste fertilizes the rice — integrated rice-fish farming

🤝 Water Spinach (Kangkong)

Water spinach thrives in flooded conditions like rice; provides an additional leafy green harvest without competing for rice's nutrient niche.

🤝 Taro

Taro grows on paddy bunds around rice paddies; uses edges rice doesn't occupy and shares water management systems.

🤝 Lotus

Lotus in deeper paddy sections provides shade suppressing aquatic weeds; roots aerate the pond bottom for rice.

🤝 Water Chestnut

Water chestnuts grow in flooded conditions as a traditional paddy co-crop; corms are harvested when paddies are drained.

🤝 Cattail

Cattails on paddy margins filter runoff water and host beneficial predatory insects; they also serve as windbreaks for rice seedlings.

🤝 Arrowhead (Sagittaria)

Arrowhead is a traditional wetland crop grown alongside rice; tubers provide secondary harvest in slightly deeper water zones.

🤝 Sesbania (green manure)

Sesbania grown before rice fixes large amounts of nitrogen; incorporation improves paddy soil structure dramatically.

🤝 Water Fern (Salvinia)

Salvinia, like Azolla, is a floating green manure for paddies; fixes nitrogen via cyanobacteria symbiosis and suppresses weeds.

⚠️ Keep Apart (7)

⚠️ Walnut (Black)

Juglone in walnut leaf litter or runoff water can be toxic to rice seedlings; rice paddies near walnut trees show poor germination

⚠️ Eucalyptus

Eucalyptus trees near rice paddies aggressively deplete groundwater and release allelopathic oils into irrigation water, reducing rice yields

⚠️ Sorghum

Both are grass family crops susceptible to the same fungal diseases; rotational proximity increases disease pressure from stem borers and rust

⚠️ Wheat

Rice and wheat share major fungal diseases including blast and sheath blight; should not be grown in close rotation or proximity.

⚠️ Barley

Barley and rice are both grass crops susceptible to similar rust pathogens; cross-infection risk makes close planting unwise.

⚠️ Oat

Oats share crown rust and other fungal pathogens with rice; proximity increases disease pressure on both crops.

⚠️ Johnson Grass

Johnson grass is a perennial weed grass harboring rice pests and diseases; aggressively invades paddies and is extremely difficult to control.

💊 Medicinal Uses

Rice is the primary caloric staple for over half the world's population and is generally well-tolerated. Brown rice retains the bran layer, providing dietary fiber, B vitamins (especially thiamine, niacin, B6), magnesium, manganese, and selenium. Rice bran oil is rich in gamma-oryzanol, a unique antioxidant shown to lower cholesterol and reduce menopausal symptoms. Rice water (the starchy water from boiling rice) is a traditional remedy for diarrhea, gastroenteritis, and as a gentle skin treatment for eczema and inflammation. Fermented rice water is used in traditional Asian skincare. In Ayurveda, rice is considered a balancing, easily digestible food. Rice-based oral rehydration solutions save millions of lives annually from diarrheal dehydration.

📜 History & Traditional Uses

Rice was first domesticated in the Yangtze River Valley of China approximately 9,000-13,000 years ago from wild Oryza rufipogon. African rice (O. glaberrima) was independently domesticated in the Niger River delta about 3,000 years ago. Rice cultivation spread throughout Asia, becoming the foundation of civilizations from Japan to India. Paddy rice cultivation shaped landscapes, societies, and cultures across Asia — the elaborate terrace systems of the Philippines, Indonesia, and China are UNESCO World Heritage sites. Rice was introduced to Europe by Arab traders and to the Americas by Spanish colonizers. Today, over 90% of the world's rice is produced and consumed in Asia.

📝 Notes

Rice is cultivated in two main systems: paddy (flooded fields) and upland (rain-fed, non-flooded). Paddy rice is unique among grains in requiring anaerobic soil conditions, which suppresses weeds and makes nitrogen more available. Rice is classified by grain type: long-grain (indica), medium-grain (japonica), short-grain, and aromatic varieties like basmati and jasmine. Rice paddies are significant sources of methane, a potent greenhouse gas. The System of Rice Intensification (SRI) is an alternative method that uses less water and fewer seeds while increasing yields. Rice can be grown in containers or small paddies in home gardens where water is abundant.