Jade plant (Crassula ovata, (Mill.) Druce 1917)

Identity

The jade plant is Crassula ovata (Mill.) Druce, an accepted species in the Crassulaceae. Its name joins two steps: Philip Miller first described it as Cotyledon ovata, and George Claridge Druce later moved it into Crassula. ^{1 2}

Crassula alludes to the thick tissues typical of the genus, while the epithet ovata describes the oval leaves. Names such as jade plant, jade tree and money plant speak mostly to looks and decorative use, and they should not lead anyone to confuse it with Pachira aquatica, another "money tree" of the houseplant trade. ^{3 4}

Recognition

An evergreen succulent shrub, Crassula ovata starts with green, fleshy stems. Older stems turn brown, thick and sometimes slightly flaky, which is why old specimens look like miniature trees. Given good conditions, horticultural sources quote a wide size range, from under 1 m (3 ft) in a compact pot to about 2 m (6.5 ft) or a little more on a mature plant. ^{5 3}

The leaves are simple, set in opposite pairs, oval to obovate, smooth-edged, glossy and very fleshy. They often measure 2.5–9 cm (1–3.5 in) long and cluster toward the branch tips. A red margin is not, on its own, a cultivar trait: it shows up mainly under strong light, provided the plant was moved into it gradually and without scorching. ^{3 4}

Flowers are a poor identification clue on an indoor plant. When they do appear, they form terminal clusters of small, starry, white to pinkish blooms, often after long nights, abundant light and a cooler or drier spell. Pollinated flowers set small seed capsules, inconspicuous and of no recognized food value. ^{3 4}

Useful taxonomy

The accepted name Crassula ovata is the stable reference point. Older names still matter, because they turn up on toxicity pages, in catalogs and on old labels. The main synonyms recorded by the taxonomic databases consulted are: ^{1 2}

• Cotyledon ovata Mill.
• Crassula argentea Thunb.
• Crassula portulacea Lam.
• Crassula obliqua Aiton
• Crassula articulata Zuccagni
• Crassula nitida Schönland
• Toelkenia ovata (Mill.) P.V.Heath

That synonymy has a safety angle. The ASPCA lists the jade plant under Crassula argentea, a name the databases consulted treat as a synonym of Crassula ovata. Read the old name as a trace of nomenclature, not as a separate plant. ^{1 6}

Habitat and range

POWO/WCVP and Trefle place the native range in southern Africa: southeastern Mozambique, KwaZulu-Natal and the Eastern Cape. There the species belongs to valley thicket, dry rocky slopes and well-drained subtropical ground, not to humid rainforest. ^{1 4}

Elsewhere, the jade plant is mainly an ornamental for pots, sunrooms, frost-free cool greenhouses or dry gardens in mild climates. Datasets record introduced populations in a few regions, including California, the Canary Islands, Madeira, Spain and Saint Helena; these records alone do not establish a general invasive status, nor an established invasive risk in mainland France. ^{1 2}

The plant's build reflects that setting. Leaves, stems and sometimes roots store water, and the branching habit helps it ride out dry periods. In a pot, the same adaptation makes too much water more dangerous than an occasional missed watering. ^{7 4}

Life cycle, flowering and propagation

Growth is slow and cumulative. A leaf or stem cutting can root, but the shrubby look takes several years to build as the stems turn woody and the branching thickens. An older plant often looks older than it is, since brown bark and leaf scars quickly suggest a small trunk. ^{4 7}

Maturity and light rhythm matter more for flowering than the calendar does. Sources disagree on the season because the plant responds to how it is grown: long nights, relative coolness, strong light and reduced watering can all come before the flower clusters. In a heated room lit in the evening, a plant that never blooms is perfectly normal. ^{3 4}

Vegetative propagation explains how far it has spread. A broken stem, or even a whole leaf left to callus over, can root in a very free-draining mix. Rooting easily is not the same as growing fast: a compact, well-branched plant that flowers is the product of years in cultivation. ^{5 4}

Uses and risks

Ornament is its main use. In mild, frost-free climates, Crassula ovata can make a small shrub for a rock garden, a dry border or a large container; where winters bring frost, it is mostly kept as a houseplant in very bright light, a sunroom plant or an informal succulent bonsai. ^{5 7}

Its toxicity deserves precise wording. The ASPCA lists the jade plant as toxic to dogs, cats and horses, with an unknown toxic principle and signs such as vomiting, lethargy and incoordination. Pet Poison Helpline generally describes mild toxicity in animals but advises veterinary care if signs persist. ^{6 8}

For people, the references consulted do not support any food or medicinal advice. Ethnobotanical uses are sometimes reported elsewhere, but they are not offered here as a recommendation: identifying the tissue, the dose, the preparation and the medical context lie beyond a horticultural summary. ⁴

Cultivars, look-alikes and buying

Cultivars mostly change leaf shape or color. Gollum and Hobbit have tubular or spoon-shaped leaves; Hummel's Sunset colors its margins more strongly in yellow, orange and red under bright light; Tricolor and Variegata refer to variegation. None of these names is a separate species. ^{3 7}

Three groups account for most mix-ups: Crassula arborescens, with rounder, blue-gray leaves; Portulacaria afra, often called dwarf jade but placed in another family; and Pachira aquatica, sold as money tree with no close botanical tie. The scientific name on the label is more reliable than any good-luck name. ^{4 3}

When buying, the signs that really count are compact growth, a firm base, healthy roots and a pot that drains. A very green plant with long, floppy stems is not necessarily sick; more often it has lacked light and will need a gradual move into brighter conditions. ^{3 7}

Main sources

• Plants of the World Online / Kew, Crassula ovata (Mill.) Druce
• GBIF Backbone Taxonomy, Crassula ovata
• North Carolina Extension Gardener Plant Toolbox, Crassula ovata
• Royal Horticultural Society, Crassula ovata
• Clemson Cooperative Extension HGIC, Jade Plant
• University of Wisconsin Extension, Jade Plant, Crassula ovata
• ASPCA Animal Poison Control, Jade Plant
• Pet Poison Helpline, Jade Plant