Growing Guide
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Annual Flower

Also known as Cupflower
Nierembergia caerula
Solanaceae Family
Synonym: Nierembergia hippomanica var. violacea

This annual features airy green foliage and yellow-centered blue, purple or white flowers.

Site Characteristics
  • full sun
  • part shade

Soil conditions:

  • requires well-drained soil
Prefers rich, moist but well-drained soil.
Plant Traits

Lifecycle: annual

Perennial grown as an annual. Hardy in Zones 7 to 10.

Ease-of-care: moderately difficult

Height: 0.5 to 1 feet

Spread: 0.5 to 1 feet

Bloom time:

  • mid-summer
  • late summer
  • early fall

Flower color:

  • blue
  • violet
  • white

Flowers have yellow throats.

Foliage color: medium green

Foliage texture: fine


  • cushion, mound or clump
  • spreading mass

Shape in flower: same as above

Special Considerations
  • frost
Special characteristics:
  • deer resistant
  • non-aggressive
  • non-invasive
  • not native to North America - Native to Argentina.
Special uses:
  • cut flowers
  • direct-seeding
Growing Information
How to plant:

Propagate by seed - Sow the seeds outdoors where desired a few weeks before the last spring frost, or indoors 8 to 10 weeks before the last spring frost.

Germination temperature: 70 F to 75 F

Days to emergence: 14 to 28

Maintenance and care:
Pinch to keep bushy. Deadhead to keep prolong blooming. Keep moist but not soggy. Fertilize regularly.

More growing information: How to Grow Annuals

'Mont Blanc': yellow-centered white flowers.

'Purple Robe': purplish-blue flowers.