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flowerBiennial
Hollyhock
Alcea rosea
Also known as: alcea
Towering cottage-garden biennial with large single or double flowers along tall stalks. Blooms second year from seed.
Growing Requirements
SunFull Sun
WaterMedium
Soil Type
Soil Drainage
Soil pH
Plant Spacing18–24″
Row Spacing24–36″
Planting Depth0.13–0.25″
Height48–96″
Spread12–18″
✗ Not Container Friendly✓ Raised Bed Friendly
Planting Schedule
Start Indoors
8–10 weeks before last frost
Direct Sow (Spring)
0–9 weeks after last frost
Transplant Outdoors
0–9 weeks after last frost
Germination
10–14 days
Days to Harvest
365–425 days
Zone Suitability
USDA Hardiness Zones
1
2
3
4
5
6
7
8
9
10
11
12
13
Zones 3–9
Can overwinter in appropriate zones
Biennial — foliage first year, blooms second. Prone to rust fungus. Plant against fence or wall for support. Self-seeds.
Companion Plants
No companion data available for this plant yet.