Delphinium semibarbatum Citrina | Zalil

Delphinium semibarbatum ‘Citrina’ | Zalil

Rare species delphinium · Lemon-yellow blooms

Delphinium semibarbatum ‘Citrina’, also known as Zalil, is a rare and striking species delphinium originating from Afghanistan and Iran. It produces long, slender flower spikes covered in clear lemon-yellow florets, an unusual and highly sought-after colour in delphiniums.

Uniquely, most florets open simultaneously, creating a dramatic and eye-catching display. In its native Persia, the flowers were traditionally used for dyeing silk. This species is also notable for its tuberous roots, similar to dahlias, rather than the fibrous roots typical of most delphiniums.

Despite its origins in arid regions, ‘Citrina’ performs best in average to slightly moist soil. In warmer climates, partial shade helps prevent summer dormancy and ensures prolonged flowering.

Plant Information

• Latin name: Delphinium semibarbatum
• Variety: ‘Citrina’
• Common name: Zalil
• Plant type: Perennial
• Plant height: approx. 75 cm
• Flower colour: Clear lemon-yellow
• Origin: Afghanistan, Iran
• Light: Full sun to partial shade
• Soil: Fertile, well-drained
• Special feature: Tuberous roots

Sowing & Germination

• Sowing period (indoors): January–May
• Autumn–winter sowing: Under glass
• Surface sow onto moist, well-drained seed compost
• Cover lightly with vermiculite

Cold stratification recommended:

• Place sown trays in a sealed bag at 4 °C for 3 weeks
• Move to 10–13 °C for germination
• Keep out of direct sunlight
• Germination: approx. 4–8 weeks

Transplant seedlings into cell trays, then pot on into 8 cm pots. Feed lightly and acclimatise before planting out from May, after frost risk has passed.

Growing Instructions

• Fertile, well-drained soil
• Shelter from strong winds; staking recommended
• Water regularly; avoid prolonged dryness
• Apply liquid feed every 2 weeks during the growing season
• Thin shoots at 7 cm height:
  • Young plants: leave 2–3 shoots
  • Established plants: leave 5–7 shoots

Care & Maintenance

• Deadhead spent flower spikes to encourage repeat blooms
• Cut back to ground level in autumn once growth has died back
• Can be propagated by basal cuttings in early spring

Uses

• Cut flowers
• Perennial borders
• Botanical and collector gardens
• Unusual colour accents in floral design