Encyclopedia
Definitive guides for crops, pests, and agricultural diseases.
Onion (Vidalia - Yellow Granex)
Vidalia Yellow Granex is a short-day, sweet yellow onion prized for its mild flavor and low pungency when grown in low-sulfur soils. This definitive guide covers botanical traits, ideal growing conditions, step-by-step planting, organic pest management, and curing protocols for commercial and home growers.
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Onion (Walla Walla Sweet)
Walla Walla Sweet onions are a mild, extra-sweet long-day variety prized for their crisp texture and low pungency. This guide delivers professional-grade advice on soil, planting, care, pests, and harvesting for reliable high-quality yields.
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Opalka Tomato
Opalka Tomato is a high-yielding, Polish heirloom paste tomato prized for its elongated fruits, dense flesh, and rich flavor ideal for sauces, canning, and drying. This indeterminate variety offers strong disease resistance and excellent productivity in home gardens and small farms. It thrives with proper support, consistent moisture, and organic management practices.
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Opus Rice
Opus Rice is a high-yielding rice variety known for its resilience and adaptability to diverse climates. It thrives in optimal conditions and requires dedicated care to reach its full potential.
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Orach (Magenta Magic)
Orach (Magenta Magic) is a vibrant, easy-to-grow leafy green known for its striking magenta-colored leaves. It thrives in a variety of soil types and is prized for its versatility as a salad green or cooked vegetable.
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Orange
Orange is one of the world’s most important fruit trees, valued for fresh eating, juice production, fragrance, and ornamental appeal. Successful orange cultivation depends on warm conditions, excellent drainage, disciplined irrigation, balanced nutrition, and vigilant pest and disease management, especially in humid or frost-prone regions.
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Orange Mint (Eau de Cologne)
Orange Mint, known as Eau de Cologne Mint, is a delightful aromatic herb with citrus-inspired flavor and fragrance, perfect for culinary uses and teas, while also repelling certain pests, offering a fragrant addition to gardens.
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Oregano
Oregano is a hardy, aromatic perennial herb prized for its intense flavor and essential oils. It thrives in well-drained soils with full sun and minimal water once established. This guide covers every stage from soil preparation through harvest and storage for commercial or home growers.
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Oregon Spring Tomato
Oregon Spring Tomato is an early-maturing, determinate variety bred for cool, short-season climates, producing medium-sized, flavorful fruits ideal for northern gardeners and commercial growers seeking reliable yields.
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Orris Root (Iris germanica)
Orris root is the dried rhizome of Iris germanica, prized for its violet-like fragrance and long history in perfumery and traditional medicine. This perennial requires well-drained alkaline soil, full sun, and a 2–3 year curing period before harvest to develop its characteristic scent. The guide covers soil preparation, planting, care schedules, organic pest management, and proper rhizome curing for commercial or home growers.
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Osmancik Rice
Osmancik Rice is a high-yield, medium-grain variety predominantly grown in Turkey for its fast-growing nature and adaptability. It requires specific soil and climate conditions for optimal growth.
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Ostrich Fern
Ostrich Fern is a cold-hardy, shade-loving perennial prized for its edible fiddleheads and lush ornamental foliage. This guide covers everything from soil preparation to harvesting, disease management, and ideal companion plants for successful cultivation.
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Oxalis
Oxalis, commonly known as oca or New Zealand yam, is a tuber crop prized for its crisp texture and tangy flavor. This guide covers everything from soil preparation and planting through harvest and storage, delivering professional-grade advice for reliable yields.
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Oyster Mushroom
Oyster mushroom is one of the most productive and adaptable cultivated fungi, valued for its rapid colonization, strong biological efficiency, and excellent culinary quality. It can be grown on pasteurized straw, hardwood sawdust, agricultural residues, and other cellulose-rich materials, making it a leading crop for small-scale and commercial mushroom production.
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Padron Pepper
Padron pepper is a traditional Spanish frying pepper prized for its thin flesh, grassy flavor, and the famous tendency for an occasional pod to deliver an unexpected burst of heat. Productive, compact, and well suited to home gardens and market production, it performs best in warm weather, fertile well-drained soil, and a steady moisture regime that prevents blossom drop and irregular fruiting.
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Palmer Mango
Palmer mango is a late-season dessert mango cultivar valued for its large elongated fruit, attractive red-purple blush, relatively low fiber, and dependable productivity in warm climates. It is especially useful for growers who want to extend mango harvest into the latter part of the season, but it performs best when given excellent drainage, careful pruning, and disciplined moisture management.
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Palmyra Palm (Borassus flabellifer)
The Palmyra Palm (Borassus flabellifer) is a resilient, multi-purpose tropical tree revered in South Asia for its sweet sap, nutritious fruits, and versatile products from leaves to roots. Thriving in arid conditions, it offers sustainable income through toddy, jaggery, and fiber, making it ideal for small farms in hot climates. This guide provides expert cultivation techniques for optimal yields.
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Papalo
Papalo (Porophyllum ruderale) is a fragrant, herbaceous plant native to Mexico and Central America, often used in traditional dishes for its bold, cilantro-like flavor. Ideal for warm climates, it thrives in well-drained soil with plenty of sun exposure.
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Papaya
Papaya is a fast-growing tropical fruit crop valued for its sweet, carotenoid-rich fruit, continuous bearing habit, and high productivity under warm, frost-free conditions. Although often called a tree, it is technically a giant, short-lived herb with a hollow stem, shallow root system, and exacting needs for drainage, warmth, balanced nutrition, and disease prevention.
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Parsley
Parsley is a cool-season biennial herb grown primarily as an annual for its aromatic leaves and edible stems. Highly valued in home gardens and market production, it performs best in fertile, moisture-retentive but well-drained soil and rewards careful establishment with a long harvest window.
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Parsnip
Parsnip (Pastinaca sativa) is a biennial root vegetable crop prized for its sweet, nutty flavor, but it faces significant challenges from pests, diseases, and environmental stresses that can devastate yields. This guide provides definitive diagnostics for symptoms like canker, leaf spot, and root damage, alongside organic management strategies, lifecycle insights, and prevention tactics. Farmers can protect [carrot](/wiki/carrot) and parsnip crops using integrated approaches to minimize losses and ensure bountiful harvests.
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Parsnip (Gladiator)
Gladiator is a high-yielding, canker-resistant parsnip cultivar prized by commercial and home growers for its smooth, tapered roots and reliable performance in cool climates. This definitive guide covers every stage from soil preparation through long-term storage, delivering professional-grade advice for consistent, high-quality harvests.
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Parsnip (Hollow Crown)
Hollow Crown is a classic open-pollinated parsnip variety prized for its long, smooth white roots and sweet flavor after frost. This definitive guide covers soil preparation, planting timelines, integrated pest management, and long-term storage methods for reliable home and market production.
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Parsnip (Turga)
Parsnip (Turga) is a cold-hardy, sweet-rooted biennial prized for its long, tapered cream-white roots and rich nutty flavor that improves after frost. This guide delivers professional-grade, field-tested advice on soil preparation, planting timing, irrigation, pest control, and storage to maximize yields for home gardeners and small-scale growers.
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