Pilea involucrata 'Moon Valley'

Where Moon Valley Pilea comes from

‘Moon Valley’ has long circulated as both Pilea involucrata and Pilea mollis. The first ranges from Central America and the Windward Islands through northern and western South America to Peru, while the second is native to north-eastern Colombia and northern Venezuela.

The deeply cratered foliage has kept the cultivar recognisable while its botanical label shifted between those species. Moon Valley's story therefore belongs to horticulture as much as botany and draws on the humid tropical background shared by both names.

Growing a foliage plant indoors

Light: Pilea ‘Moon Valley’ grows well in bright filtered light to moderate shade. It does not need intense sun to maintain its deeply textured foliage, and abrupt full sun can scorch the raised leaf surface.

Watering, substrate and humidity: Use an organic, moisture-retentive mix opened with coarse or mineral material. Moderate to high humidity supports clean leaf expansion, while trapped droplets and stagnant air around the corrugated leaves increase disease pressure. Water when the upper centimetre starts to dry, directing water beneath the corrugated foliage and draining the pot before the fine roots dry throughout.

Feeding and propagation: Feed at low strength during active growth because concentrated fertiliser salts can damage the roots and leaf margins. Stem tips with one or more nodes root in a moist, airy medium, and stems can be pinned down until roots form.

Common issues and fixes

Crisp margins follow severe drying, salt build-up or hot dry air, while washed-out tan patches suggest sun scorch. New leaves that remain small or misshapen may also reflect damaged roots or feeding pests. Check moisture, drainage and the undersides of young foliage before choosing a response. Remove only badly damaged leaves and judge recovery from clean new growth.

The deeply corrugated surface can hold droplets and debris. Expanding dark, water-soaked or haloed spots are more consistent with leaf-spot disease than with simple dry edges. Separate the plant, stop wetting the foliage, improve air movement and remove heavily affected leaves with clean tools. Avoid handling healthy leaves after touching affected spots. If spotting continues under dry foliage, reassess roots and seek a diagnosis before using a fungicide.

Blackening or translucence at the stem base indicates decay from a persistently wet, airless mix. Before the damage advances, save firm tips with healthy stem joints from which new growth can develop. Mites cause fine stippling, while thrips leave silvery scars and dark waste specks around new leaves. Confirm the pest with close inspection, isolate the plant and repeat an appropriate labelled treatment until fresh growth opens without new feeding damage.

Pilea involucrata ‘Moon Valley’ is non-toxic to people and pets

• This plant is non-toxic to people, cats and dogs.
• Chewing a large amount can still cause an upset stomach.
• If a large amount is eaten and symptoms continue, contact a veterinarian or medical professional.

Pilea involucrata: name and meaning

Pilea alludes to a felt cap through Latin pileus, referring to the small cap-like flower structure over its dry fruit. The epithet involucrata is Latin for enclosed or wrapped in an involucre.

John Lindley established the genus Pilea in 1821 in Collectanea Botanica, plate 4.

John Sims first described it as Urtica involucrata in 1824 in Botanical Magazine, volume 51, plate 2481. Charles Henry Wright and D. Dewar later placed it in Pilea as Pilea involucrata in 1894 in Johnson’s Gardener’s Dictionary, page 1056.