How to Grow Zinnias in South Africa
Want bright summer beds, cheerful patio pots or flowers to cut for a vase? Grow zinnias in a sunny spot once frost has passed and the soil is warm. Choose tall Giant varieties for cutting, compact Magellan for containers, or Profusion, Zahara, Double Zahara and Zesty for colourful borders. Follow the section linked from your product page for the right spacing and care.
Quick Grow Facts
- Season: spring and summer; plant outside only after frost and once soil is warm.
- Light: full sun, ideally at least six hours.
- Sowing: use trays or direct sow. Cover seed lightly in a moist, well-drained seed-starting medium; use the series guidance below.
- Germination: keep the medium warm and use the series guidance below. Emergence speed varies with variety, temperature and moisture; avoid cold, saturated soil.
- Moisture: keep evenly moist until emergence. Afterward, water at soil level and let the surface begin to dry between waterings.
- Transplanting: harden off and transplant promptly before roots become congested.
Tall giant cut zinnias
Shop seeds covered in this section: Zinnia California Giants Mix Seeds · Zinnia Elegans Giant Coral Seeds · Zinnia Elegans Giant Deep Red Seeds · Zinnia Elegans Giant Lilac Seeds · Zinnia Elegans Giant Lime Seeds · Zinnia Elegans Giant Purple Seeds · Zinnia Elegans Giant Salmon Rose Seeds · Zinnia Elegans Giant White Seeds · Zinnia Elegans Giant Wine Seeds
This section covers California Giants Mix and the eight Giant colour products: Coral, Deep Red, Lilac, Lime, Purple, Salmon Rose, White and Wine. They are tall annual Zinnia elegans for sunny cutting rows and tall borders.
- California Giants Mix: cover lightly, keep the medium around 22°C and allow approximately 5–10 days under favourable conditions. These tall plants commonly reach about 90 cm; space approximately 35 cm apart in a sunny garden bed.
- Eight Giant colours: cover lightly with vermiculite; aim for 20–22 C and 7–10 days. Plants reach about 100 cm high and 30–35 cm wide. Space 20–25 cm in a supported cut row or approximately 25–30 cm in a garden bed.
- Support tall plants in exposed sites. Pinch above three to four true leaf pairs only when more branched, slightly shorter cut stems are wanted; pinching is not compulsory.
Magellan Mix
Shop seeds covered in this section: Zinnia Magellan Mix Seeds
Magellan is compact Z. elegans with large double flowers on compact plants about 30–35 cm high and 25–30 cm wide. Sow one seed per cell, cover lightly and keep the medium evenly moist during germination. Space 25–30 cm apart. Use in containers, edges and compact sunny beds.
Profusion Mix
Shop seeds covered in this section: Zinnia Profusion Mix Seeds
Profusion Mix is a hybrid zinnia with a spreading growth form. Cover with a light layer of vermiculite and aim for a medium temperature near 25°C during germination. Keep the mix moist, not waterlogged. Space 45–60 cm apart to accommodate plants about 36–46 cm high and 51–61 cm wide. Enjoy a colourful mix for sunny beds and broad containers.
Profusion is heat and drought tolerant once established and has strong foliar-disease resistance, but it is not immune. It is well suited to landscapes and humid districts. Pinching is normally unnecessary.
Zahara single flowers
Shop seeds covered in this section: Zinnia Zahara Cherry Seeds · Zinnia Zahara Mix Seeds · Zinnia Zahara Raspberry/Lemonade Mix Seeds · Zinnia Zahara Starlight Rose Seeds · Zinnia Zahara Sunburst Seeds · Zinnia Zahara White Seeds · Zinnia Zahara Yellow Seeds
These Z. marylandica plants grow about 30–46 cm high. Cover lightly, aim for 20–23 C and space 20–25 cm apart. They suit sunny beds and containers and offer useful heat, drought and disease resistance after establishment.
Double Zahara
Shop seeds covered in this section: Zinnia Zahara Double Bright Orange Seeds · Zinnia Zahara Double Brilliant Mix Seeds · Zinnia Zahara Double Cherry Seeds · Zinnia Zahara Double Fire Seeds · Zinnia Zahara Double Mixture Seeds · Zinnia Zahara Double Raspberry Ripple Seeds · Zinnia Zahara Double Salmon Seeds · Zinnia Zahara Double White Seeds · Zinnia Zahara Double Yellow Seeds
Double Zahara uses the same light-cover, 20–23 C and 20–25 cm spacing method as single Zahara. Plants reach about 41–51 cm. The customer distinction is the fuller double flower form, not a different sowing depth.
Zesty colours
Shop seeds covered in this section: Zinnia Zesty Orange Seed · Zinnia Zesty Pink Seed · Zinnia Zesty Purple Seed · Zinnia Zesty Scarlet Seed · Zinnia Zesty White Seed · Zinnia Zesty Yellow Seed
Zesty is Z. elegans with large, colourful flowers. Sow one seed per cell, cover lightly and maintain even moisture until emergence. Plants reach approximately 46–61 cm high and wide; space 25–30 cm in borders and containers. Support only in exposed wind.
Regional South African timing
- Winter-rainfall Western Cape: sow from late winter into spring once cold saturated soil eases. Use the sunniest, freest-draining bed and water through the dry summer.
- Frost-prone interior: direct sow only after damaging frost. Start in cells under protection for an earlier crop and harden seedlings before planting out.
- Humid coast and KZN Midlands: favour Profusion or Zahara, use wider spacing and morning soil-level watering, and keep foliage airy.
- Hot-dry or subtropical interior: sow before peak heat where possible. Mulch established plants and water deeply; protect containers from severe afternoon heat without sacrificing flowering light.
Care, flowers and cutting
Avoid high-nitrogen feeding, which creates soft leafy stems. Feed lightly with a balanced product after establishment. Deadhead bedding plants. Cut vase stems when flowers are nearly fully open and the stem is firm. Succession sow every two to three weeks while frost-free weather remains.
Troubleshooting
If seedlings fail, check for cold soil, deep sowing, dried-out medium or saturated mix. Improve airflow for damping-off and powdery mildew. Weak flowering usually indicates shade or excess nitrogen; lodging usually indicates crowding, wind or soft growth.
Seed safety
Use these ornamental flowers for garden display and cutting. Do not eat sowing seed, and keep it away from children and pets. Wash your hands after handling seed and gardening materials.