Hollyhock Summer Carnival

Alcea rosea 'Summer Carnival' First-Year Flowering Hollyhock 'Summer Carnival'

The award-winning Hollyhock that flowers in its first summer — bred specifically for speed rather than the traditional two-year biennial cycle. 'Summer Carnival' produces fully double ruffled peony-like flowers on 1.5-metre spikes in a carnival mix of powder-puff pink, bright scarlet, sunny yellow, and pure white — all completing the full growth cycle in a single UK summer from an early sowing.

If you love the towering majesty of cottage garden Hollyhocks but don't want to wait a whole year for them to bloom, 'Summer Carnival' is the answer. This is the RHS Award of Garden Merit variety bred specifically to flower in its first summer from an early sowing — proof of its status as a reliable, vigorous and exceptionally beautiful performer in British gardens. The plants produce tall sturdy spikes (up to 1.5m) covered in fully double, ruffled flowers that look like giant peonies, in a carnival of colours: powder-puff pink, bright scarlet, sunny yellow and pure white. Hardy annual or short-lived perennial (H5). If sown in early spring (January or February indoors), it completes its entire cycle — from seed to 1.5-metre flowering spike — in just one UK summer.

A note on growing

The key to first-year flowering: start early indoors. Sow January–March at 18–20°C in deep pots (root trainers or 9cm pots) to accommodate the long taproot. Surface-sow or barely cover; germination 7–14 days. Pot on into larger containers as seedlings develop. Harden off carefully and plant out in May or June after all risk of frost. Plant in full sun in rich, well-drained soil — a position against a warm wall is ideal.

If sown in autumn or treated as a biennial, 'Summer Carnival' will follow the traditional two-year cycle, but the magic of this variety is the first-year-flowering capability from early sowings.

⚠️ Same Hollyhock cautions: rust prevention (water at base only, allow air circulation, cut down after flowering), skin irritation from bristly stems (wear gloves), and the deep taproot's resentment of transplanting.

Where it shines

In impatient gardens that want Hollyhock drama in a single season. As the rapid-result variety for filling new borders with cottage character without waiting. Against warm walls and fences for traditional architectural display. At the back of mixed cottage borders where the 1.5m height anchors the planting. In containers and large patio pots for a designer cottage feel. The peony-like fully-double flowers are particularly photogenic and bring proper showstopper quality to any cottage garden.

Plant alongside

For a first-year cottage scheme without waiting, plant 'Summer Carnival' alongside Larkspur 'Giant Imperial Mix' (also first-year), Cosmos 'Sensation Mixed' and Cornflower 'Blue Ball' for a complete instant cottage cutting garden in a single season. For colour-coordinated planting, the carnival mix works beautifully with the deep tones of Hollyhock 'Nigra'.