How to grow Hollyhocks

Hollyhocks

Alcea rosea

Tall, romantic spires of fully double blooms in soft peach and blush tones. A classic cottage-garden flower that adds height, texture, and old-world charm to the back of beds and borders.

Although hollyhocks are typically grown as biennials, these bloomed for us the first year from seed. After cutting the plants back in fall, they are already showing signs of returning again.

Details

Plant type: Biennial (often blooms first year)
Height: 3–6 ft
Site: Full sun
Days to maturity: 120–365 days
Plant spacing: 12–18”

Kids, Pets & Deer: Non-toxic, deer resistant
Indoor & Pots: Not suitable for containers

Approx. seeds per packet: 50+

Typical hollyhock packets contain ~25–30 seeds. Because germination tested at 71%, we’ve doubled the seed count to give you plenty of plants.

How to Grow

Transplant (optional):
Sow seeds indoors 6–8 weeks before your last frost in deep cells or pots. Hollyhocks develop long taproots and do best with minimal root disturbance. Sow seeds and cover lightly (about ¼") with soil or vermiculite. Keep soil evenly moist until germination. Harden off and transplant outdoors after danger of frost has passed.

Direct seed (recommended):
Sow outdoors around your last frost date, planting seeds about ¼" deep. Thin or space plants 12–18" apart. Plants started early may bloom the first year; otherwise they will establish a rosette and bloom the following season.

Germination:
7–14 days at 65–75°F (18–24°C). Keep soil evenly moist during germination.

Where to Plant

Plant in full sun in well-drained soil rich in organic matter. Hollyhocks benefit from consistent moisture and good air circulation. Because plants grow tall, planting along a fence or wall for support can help prevent wind damage.

Harvest / Vase Life

Harvest when the lower blooms are open and stems feel firm near the base of the spike. Vase life is 3–5 days, with new flowers opening up the stem while older blooms drop after a couple of days.