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Alpine RockeryConservatory Greenhouse

Petrocosmea minor Hemsl.

smaller petrocosmea

A tender, evergreen perennial with rounded, fleshy leaves overlapping to produce a flat rosette up to 15cm across. Some forms have smooth, shiny foliage, others have deep veins and appear quilted. Purple, white-throated, bell-shaped flowers are produced in small clusters on upright stems in summer

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Ultimate height

Up to 10cm

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Loam

Sand

Moisture

Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Partial shade

Aspect

North–facing or West–facing or East–facing

Exposure

Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Gesneriaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Matforming
Genus: Petrocosmea are evergreen perennials producing low rosettes of fleshy, often felted, lance-shaped or rounded leaves. Five-lobed, tubular to bell-shaped flowers are produced in small clusters in spring
Name status: Correct
Plant range: SE Yunnan

How to grow

Cultivation

Grow in a shallow pot of very well-drained compost in a cool greenhouse or alpine house, in semi-shade, with a humid atmosphere

Propagation

Propagate by seed or by leaf cuttings

Suggested planting locations and garden types

Patio and container plants

Pruning

No pruning required

Pests

May be susceptible to aphids and glasshouse whitefly

Diseases

Generally disease-free

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