Tetranema roseum

RHS Plant Profile
Mexican foxglove

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Other common names

Mexican foxglove, Mexican violet

Synonyms

Tetranema mexicanum

Conservatory Greenhouse

A woody-based evergreen perennial to 20cm tall, with obovate leaves to 15cm long and clusters of trumpet-shaped, 2-lipped, light purple flowers to 1.5cm across, paler in the throat

Position

Full shade

Soil Types

Loam

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Loam
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full 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)
H1B

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Plantaginaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Bushy
Genus
Tetranema are evergreen perennials or subshrubs with rosettes of leathery, scalloped leaves and erect stems bearing clusters of trumpet-shaped mauve to deep pink flowers in summer
Name Status
Correct

How to Grow

Cultivation

Under glass, grow in a moist but well-drained, peat-free, loam-based compost in bright, but diffused light. Happy in moderate to high levels of atmospheric humidity. Water moderately in summer and fertilise with a balanced fertiliser once a month. Reduce watering in winter.

Propagation

Propagate by seed sown in containers at 18-21C (64-70F) as soon as ripe or in spring. Established clumps can be divided in spring.

Suggested planting locations and garden types

  • Patio and container plants

Pruning

No pruning required

Pests

May be susceptible to aphids

Diseases

Generally disease-free