Spinacia oleracea inermis

RHS Plant Profile
round-seeded spinach

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Other common names

summer spinach

Annual Biennial

A round seeded spinach which copes well with high temperatures, great for harvesting through the summer.

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1 year
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
South–facing or East–facing or West–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)
H2

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Amaranthaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Spinacia are annual or biennial herbaceous plants, usually dioecious, with upright stems and smooth leaves that are ovate or triangular. Edible species are cultivated for their leaves (spinach)
Name Status
Unresolved

How to Grow

Cultivation

Does best on fertile soil rich in organic matter with a steady moisture supply. Winter crops need a sunny position, summer crops benefit from a little shade. Sow from February (under biodegradable fleece or cloches) to the end of May. See spinach cultivation

Propagation

Propagate by seed. See sowing vegetable seeds

Suggested planting locations and garden types

  • Patio and container plants

Pruning

No pruning required

Pests

Generally pest-free but may be susceptible to damage by slugs and/or pigeons

Diseases

May be susceptible to spinach downy mildew