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How to Grow Papaver — Poppy Flowers

Iceland poppy
Iceland poppy, Papaver croceum

Poppy flowers–members of the Papaver genus–are bright additions to the summer garden. Poppy flowers bear solitary or double cup-shaped flowers from 2 to 4 inches (5-10cm) across. Flowers often have a crepe-papery texture. Colors can be white, yellow, pink, red, orange, salmon, and purple.

There are annual and perennial poppy flowers. Best known are the Iceland poppy, Oriental poppy, and Flanders poppy, also called Shirley poppy. The Iceland and Oriental poppies are short-lived perennials, often grown as annuals. The Flanders poppy is and annual. (See the list varieties below for fuller descriptions.)

Poppies have long flowering stems that grow from a mound of divided foliate. Leaves are lance-shaped.

Poppies are best grown in mixed borders, meadows, or rock gardens, and also make good cut flowers.

Oriental poppy flowers, Papaver orientale
Oriental poppy flowers, Papaver orientale

Get to Know Papaver–Poppy Flowers

  • Plant type: Hardy annual or perennial
  • Growing Zones and range: Zones 2 to 9
  • Hardiness: Resistant to cole, not tolerant of excessive heat
  • Height and width: 12 to 24 inches (30-61cm) tall or more; 6 to 18 inches (15-45cm) wide
  • Foliage: Deeply cut
  • Flowers: Wide spreaing bowl-, cup-, or saucer-shaped single, semi-double, double flowers, crepe-papery texture 2 inches across or more
  • Flower colors: Shades of red, pink, orange, yellow, white, and bicolors
  • Bloom time: Early spring and summer depending on the variety
  • Uses: Seasonal bedding, meadow gardens, cottage gardens, containers
  • Common name: Annual poppy, Iceland poppy
  • Botanical name: Papaver
  • Family: Papaveraceae
  • Origin: Central and South Europe and temperate Asia

Where to Plant Papaver–Poppy Flowers

  • Plant poppies in full sun in Zones 2-6; plant in partial shade in Zones 7-11.
  • Grow poppies in average to humus-rich, well-drained soil.

Papaver Uses

  • Papaver can be added to beds and borders; flowers make a dramatic statement when massed.
  • Smaller cultivars are suited for a rock garden or annual border.
  • Papaver are excellent cut flowers; cut when flowers are in bud, and seat stem ends in boiling water or over a flame.
Iceland poppy, Papaver nudicaule
Iceland poppy, Papaver nudicaule

When to Plant Papaver–Poppy Flowers

  • In Zones 3-7, sow seeds directly onto prepared soil in early spring, 2 to 3 weeks before the last frost. In Zones 8-10, sow seeds in late autumn. The seeds can be lightly covered with soil.
  • Start seeds of annual varieties indoors in early spring, 6 to 8 weeks before the last frost; start perennials varieties any time spring through summer up to 3 months before the first frost in fall.
  • Set transplants outdoors in mid-spring; transplant carefully as poppies do not like their roots disturbed.
  • Annual poppies do not have long blooming periods, so sow seed successively every two weeks for continual color.
Shirley poppy, Papaver rhoeas
Shirley poppy, Papaver rhoeas

Planting and Spacing Papaver–Poppy Flowers

  • Press seeds into the soil, but do not cover them with soil; instead, cover the flat or pot with black plastic until they germinate; all except Oriental poppies need darkness to germinate.
  • Set the flats or pots in a cool place (55°F/12.8°C) to germinate; germination will occur in 10 to 15 days.
  • Grow seedlings in bright sunlight or a few inches below fluorescent light.
  • Move poppies to individual pots when they become crowded.
  • Space annual poppies 6 to 12 inches (15-30cm) apart; sow plants in groups of a dozen or more for best effect.

How to Water and Feed Papaver–Poppy Flowers

  • Poppies require moderate water; keep the soil evenly moist.
  • Mulch around growing plants with aged compost or chopped leaves to keep moisture in the soil and the soil cool.
  • Fertilize poppies lightly at planting time; poppies do not need fertilizing during the growing season.

Care of Papaver–Poppy Flowers

  • Keep faded flowers picked to prolong blooms.
  • Oriental poppies lose their foliage in midsummer; the foliage will reappear in autumn. Fill the blank spots in the garden with other annuals until the oriental poppies reappear.
  • Avoid overwatering; roots that are too wet can rot or become diseased.
  • Pests are usually not a problem.
  • Protect perennial poppies from winter cold; place 3 to 5 inches (7.6-12cm) of shredded leaves over plants in winter.

Papaver–Poppy Flowers Pests and Diseases

  • Powdery mildew, leaf smut, gray mold, root rot and damping off can occur.

Papaver–Poppy Flowers Propagation

  • Sow seed in the garden in spring for annuals and biennials.
  • Sow perennials in containers in autumn or spring.
  • Seeds germinate in 7 to 12 days at 65° to 70°F (18-21°C). Plants will be large enough for transplanting in 16 to 25 days. Flowers usually appear 18 to 19 weeks after sowing.
  • Divide perennials in spring or take root cuttings in late autumn or early winter.
Papaver alpinum known as Alpine poppy
Papaver alpinum known as Alpine poppy

Papaver–Poppy Flower Varieties to Grow

  • Alpine poppy, Papaver alpinum, is a perennial. It grows 5 to 10 inches (12-25cm) high has 1.5-inch flowers of white, yellow, and pink. The Alpine poppy blooms in spring.
  • Papavar commutatum is a hardy annual that grows to 18 inches (45cm) tall; flowers are dark red with a black center. This poppy blooms in summer.
  • Iceland poppy (Papaver croceum or P. nudicaule) is a perennial in mild-winter regions; it is commonly grown as an annual. It grows 12 to 24 inches (30-61cm) tall. Flowers are fragrant, 1 to 4 inches (2.5-10cm) across, single or double, and white with yellow, red, orange, rose, or apricot markings. It blooms in spring and will not tolerate summer heat in most zones.
  • Oriental poppy, Papaver orientale, is a perennial. Flowers are 3 inches (7.6cm) across; they are white, orange, pink, red, or salmon with a black center. Plants grow to 4 feet (3.2m) tall and bloom in early summer.
  • Shirley or Flanders poppy, Papaver rhoeas, is an annual. Flowers are 2 inches (5cm) across and red, purple, white, pink, salmon, or orange. It blooms in summer. Plants are 2 to 3 feet (61-91cm) tall.
  • Papaver somniferums is the opium poppy.

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