Zinnia Oklahoma

Zinnia Oklahoma is a reliable favourite with bright, rounded blooms in a cheerful mix of colours—from soft whites and yellows to vibrant pinks and scarlets. The flowers are mostly fully double, with some semi-doubles in the mix, and they hold up well both in the garden and in a vase. It’s a top performer for late summer colour and ideal for cutting. RHS Award of Garden Merit.

🌸 Flowering: July to September/October (first frosts)

📏 Height: to 75-100cm

🌿Annual

SOW
Sow in trays or pots from March to April. Cover seeds lightly with compost, perlite or vermiculite, and keep at around 18°C. Germination usually takes 1–2 weeks. Once seedlings are big enough to handle, pot them on—take care to minimise root disturbance. Or, from May/June, sow thinly direct into a sunny bed after the last frost.

GROW
Harden off indoor-raised plants before planting out at about 30-45cm apart in rich soil and full sun. Thin out direct-sown seedlings as they grow. Zinnias love warmth and good soil—and will reward you with bold blooms right through summer.

ENJOY
Perfect for cutting – long-lasting in a vase and blooming for weeks outdoors too. Their tidy, uniform shape makes arranging easy, and they’re just as happy brightening up beds and borders as they are in a jug on the kitchen table.