Honeysuckle (Lonicera): description, distribution, uses and management Honeysuckle Honeysuckles (genus Lonicera) are shrubs and climbing vines noted for tubular flowers, fragrant nectar and berry fruits. Found across Asia, Europe and North America, they are ornam…
Hop (Humulus lupulus): the plant, its use in brewing and other meanings Hop Hop (Humulus lupulus) is a climbing perennial grown for its female cones used in beer for bitterness, aroma and preservation. Also denotes a short jump, a dance, or a single step i…
Hops (Humulus lupulus): Characteristics, Cultivation, Uses, and History Hops Hops are the cone-shaped female flowers of Humulus plants, prized for bittering, flavor and aroma in beer. This article covers their botany, cultivation, processing, historical use…
Horneophyton: an early Devonian plant linking bryophytes and vascular plants Horneophyton Horneophyton is an Early Devonian fossil plant known from the Rhynie chert. It shows a mix of simple conducting tissue and bryophyte-like features, important for understanding earl…
Hornwort (non-vascular bryophyte) Hornwort Hornworts are small, non-vascular plants distinguished by a hornlike sporophyte. This article summarizes their form, life cycle, ecology, taxonomy, and ecological importance.
Horse chestnut (Aesculus hippocastanum): description, uses, and distinctions Horse chestnut Large ornamental tree native to the Balkans, known for shiny conkers and toxic seeds; historically used in folk veterinary remedies. Widely planted; processed seed extracts are use…
Horseradish: description, chemistry, cultivation, and culinary uses Horseradish Horseradish (Armoracia rusticana) is a pungent perennial in the Brassicaceae family, grown for its large white root and used as a condiment, traditional remedy and culinary spice a…
Horsetail (Equisetum): an ancient group of spore-bearing plants Horsetail Horsetails are ancient, spore-producing vascular plants once abundant in Paleozoic forests. Today a single living genus, Equisetum, remains. Known for jointed, silica-rich stems, r…
Horticulture: Science and Practice of Garden Plant Cultivation Horticulture Horticulture is the applied science and art of cultivating garden plants for food, ornament and utility, blending botany, propagation, breeding and landscape practices to support e…
Houseplant (indoor plant care, uses, and selection) Houseplant An overview of houseplants—plants grown indoors for decoration and wellbeing—including their needs, common species, cultural history, practical uses, and care advice for low‑light…
Huckleberry Huckleberry — a common name in North America for several berry-producing shrubs in the genera Gaylussacia and Vaccinium (family Ericaceae), valued for wild fruit, ecology and regio…
Humulus (hops): botanical profile, cultivation, and uses Humulus Humulus, commonly known as hop, is a genus of climbing flowering plants grown for its female cones used in brewing, flavoring, and other applications; related to Cannabis in the Ca…
Hydrangea (Hortensia): description, species and cultivation Hydrangea Hydrangea, or hortensia, is a genus of about 70–80 species of shrubs and climbers prized for large flower heads. This article covers appearance, species, soil effects on color, cul…
Hydroponics: Soilless Plant Cultivation and Systems Hydroponics Hydroponics is the cultivation of plants in water-based nutrient solutions instead of soil. It covers several system types, history, benefits, common crops, and practical considera…
Hymenocallis (spider-lily): a genus of bulbous Amaryllidaceae from the Americas Hymenocallis Hymenocallis is a genus of about fifty bulbous perennial plants in the Amaryllidaceae. Native to tropical and subtropical Americas, they produce showy, often fragrant 'spider-lily'…
Henbane (Hyoscyamus niger): description, toxicity, history and uses Hyoscyamus niger Hyoscyamus niger, commonly called henbane or stinking nightshade, is a poisonous Solanaceae herb containing tropane alkaloids; historically used medicinally and ritually but danger…
Hyperaccumulator plants: species that concentrate metals in their tissues Hyperaccumulator Plants that tolerate and concentrate unusually high levels of metals in their tissues. Covers mechanisms, genetics, ecological role, notable examples and applications such as phyto…
Hyssopus (hyssop): small aromatic Lamiaceae genus native to Eurasia Hyssop Hyssopus (hyssop) is a small Eurasian genus of 10–12 aromatic Lamiaceae species—herbaceous to semi-woody plants with scented foliage and blue summer flowers, including the garden h…
Iboga (Tabernanthe iboga): plant, chemistry, uses, and cultural context Iboga Iboga is a Central African rainforest shrub whose root bark contains the alkaloid ibogaine. It has traditional ritual uses and is studied for effects on the nervous system and addi…
Impatiens — touch-me-nots: natural history, characteristics, and cultivation Impatiens Impatiens are a diverse genus of flowering plants known as touch-me-nots for their explosive seed pods. This article covers their traits, distribution, horticulture, and notable fa…
Imperial lemon A citrus hybrid thought to combine lemon and grapefruit traits; valued for its intermediate size, bright acidity and culinary versatility. Overview, characteristics, cultivation an…
Indian gooseberry (Amla) Indian gooseberry Indian gooseberry, commonly called amla (Phyllanthus emblica), is a deciduous tree valued for its vitamin-C rich fruit used in cuisine, traditional medicine, and commercial product…
Indiangrass (Sorghastrum nutans): North American prairie grass Indiangrass Indiangrass (Sorghastrum nutans) is a native North American warm‑season prairie grass valued for its golden seedheads, deep roots, wildlife habitat, restoration use, and status as…
Indigofera — genus of indigo-producing and leguminous plants Indigofera Indigofera is a large genus of about 700 legume species, mainly tropical. Species are valued for natural indigo dye, ornamentals, forage and soil improvement; many fix nitrogen and…
Inflorescence: Forms, structure, and function of flower clusters Inflorescence Overview of inflorescences — the ways flowers are arranged on a plant stem, common types (raceme, spike, panicle, umbel, cyme, capitulum), their development, ecological roles and u…
Intercropping: principles, types, benefits and practical considerations Intercropping Intercropping is the simultaneous cultivation of two or more crops in the same field to increase productivity, improve resource use, conserve soil and enhance resilience in farming…
Iridaceae: the iris family — traits, history, and garden importance Iridaceae Iridaceae is a family of perennial monocot herbs (about 80 genera, 1,500 species) known for sword-like leaves, showy bisexual flowers, and storage organs such as rhizomes, bulbs, o…
Iris (plant): genus of flowering plants and garden favorites Iris (plant) Iris is a genus of roughly 260–300 species of showy flowering plants in the Iridaceae family. This article covers appearance, taxonomy, history, cultivation and commonly grown grou…
Iron deficiency (plant disorder) A botanical overview of iron deficiency in plants: causes, symptoms, diagnosis, management and prevention of nutrient-driven chlorosis affecting growth and yield.
Ironbark (Eucalyptus): characteristics, ecology and uses Ironbark Ironbark refers to several Eucalyptus species with dark, deeply furrowed bark. This article covers their traits, fire adaptations, common species, uses and how they differ from oth…
Irrigation Sprinkler: Systems, Types, Uses, and Maintenance Irrigation sprinkler An overview of irrigation sprinklers: how they work, main components and types, common uses in gardens and agriculture, historical development, advantages, limitations and maintena…
Ixia (African corn-lily): description, habitat, cultivation, and uses Ixia Ixia is a South African genus of bulb-like flowering plants in the iris family, grown for colorful star-shaped flowers and used in gardens and cut-flower arrangements.
Jacaranda — genus of flowering trees and ornamental shrubs Jacaranda Jacaranda is a genus of about 49 tropical and subtropical flowering plants in the family Bignoniaceae, cultivated worldwide for showy, tubular flowers and shade.
Jacaranda mimosifolia — the blue jacaranda (fern tree) Jacaranda mimosifolia A subtropical ornamental tree in the Bignoniaceae family, prized for its showy lavender-blue flowers, fern-like foliage, and wide cultivation from South America to warm temperate r…
Jackfruit (Artocarpus heterophyllus): overview, uses, cultivation and facts Jackfruit Jackfruit is a large tropical fruit valued for its size, versatility and nutrition. This article explains its botany, history, culinary uses (ripe and unripe), cultivation, and not…
Jalapeño: description, origin, culinary uses and distinctions Jalapeño A medium-hot Mexican chili pepper (Capsicum) commonly used fresh, pickled or smoked (chipotle); notable for green-to-red ripening, moderate heat (thousands of Scoville units) and v…
Jamun (Jambul) — Syzygium cumini: description, distribution, uses Jambul Jamun (Syzygium cumini), also called jambul or java plum, is a tropical evergreen tree valued for its edible dark berries, timber and traditional medicinal uses; native to South an…
Japanese plum (Prunus salicina): description, cultivation, and uses Japanese plum Prunus salicina, commonly called the Japanese or Chinese plum, is a small deciduous fruit tree grown for fresh fruit and processing. Overview, characteristics, cultivation, history…
Jardin des Plantes, Paris — France's principal botanical garden Jardin des Plantes Historic botanical garden and research complex on the Seine's left bank in Paris, combining living collections, museums, a menagerie, scientific education and conservation.
Jasmine (Jasminum): fragrant shrubs and vines used in gardens, perfume, and tea Jasmine Jasmine (genus Jasminum) comprises about 200 species of fragrant shrubs and vines grown for ornament, perfumery and scented teas; valued across cultures for its flowers and aroma.
Jasminum officinale — common jasmine (Poet's jasmine) Jasminum officinale Jasminum officinale, commonly called common jasmine or Poet's jasmine, is a fragrant climbing shrub in the olive family cultivated for ornament, perfumery and traditional uses.
Jazz (apple) Jazz is the commercial name for the Scifresh apple, a New Zealand-bred, trademarked dessert apple prized for its crunchy texture, sweet-tart flavor and red-blushed skin; grown inte…
Jerusalem artichoke (Helianthus tuberosus): overview, uses, and cultivation Jerusalem artichoke A concise encyclopedia entry on the Jerusalem artichoke (Helianthus tuberosus), its botany, history, culinary and industrial uses, cultivation, and notable distinctions.
Jerusalem Botanical Gardens Public botanical gardens in Jerusalem that serve as Israel’s national botanical gardens, combining plant collections, conservation, research and public education across the Hebrew…
John Gould Veitch: Victorian Plant Hunter and Veitch Nursery Heir John Gould Veitch John Gould Veitch (1839–1870) was a British plant collector and traveller who introduced numerous tropical and greenhouse plants to Victorian Britain and helped expand the Veitch f…
Jonagold (apple cultivar) Jonagold Jonagold is an apple cultivar from a Golden Delicious × Jonathan cross, valued for large, sweet-tart fruit with thin skin, aromatic flesh and versatility for fresh eating, baking a…
Jostaberry (Ribes × nidigrolaria): a hybrid currant-gooseberry shrub Jostaberry Jostaberry is an interspecific hybrid of Ribes combining traits of black currant and gooseberry. It yields dark, tart berries and is grown in temperate gardens for fresh eating, pr…
Juglandaceae (Walnut Family): characteristics, genera, distribution, and uses Juglandaceae Juglandaceae, the walnut family of trees and shrubs in the order Fagales, includes walnuts, hickories and pecans. Known for pinnate leaves, nut-like fruits, valuable timber, and al…
