Malvaceae
Hollyhock (Alcea) Care Guide
Alcea
Plant hollyhocks in full sun with fertile, well-drained soil. Water deeply and regularly at the base to keep foliage dry, which helps prevent rust disease. Stake tall spikes in windy sites. Remove spent flower stalks after blooming and clear fallen leaves in autumn to reduce rust and leaf-spot buildup.
Every 7 days
Direct sun
-20° - 35°C
40% - 70%
Categories
What is Hollyhock?
Hollyhock (Alcea) is a medium-care plant from the Malvaceae family. Alcea is a genus of about 60-80 tall, showy flowering plants in the mallow family (Malvaceae), native to southwestern and central Asia and southeastern Europe. The most widely cultivated species, Alcea rosea, is a beloved cottage-garden classic prized for its towering flower spikes, which can reach...
Hollyhock grows up to 2.5m, spread of 60cm, watering every 7 days, -20°C – 35°C, 40–70% humidity. It is not suitable for indoor environments and safe for pets.
Unlike many popular species, Hollyhock is safe to keep around pets.
How to Care for Hollyhock?
TLDR: Hollyhock needs Direct sun, watering every 7 days, and temperatures between -20-35°C with 40-70% humidity.
How Often Should You Water Hollyhock?
Water deeply once the top few centimeters of soil dry out, aiming for the base of the plant rather than the foliage - wet leaves encourage rust and fungal disease.
How Much Light Does Hollyhock Need?
Give hollyhocks at least 6-8 hours of direct sun daily; morning sun is ideal since it dries dew quickly and reduces disease pressure.
What Is the Best Soil for Hollyhock?
Grow in fertile, humus-rich, well-drained loam with a neutral to slightly alkaline pH (6.0-7.5); avoid soggy winter soil, which causes crown rot.
What Pot Should You Use for Hollyhock?
Large deep containers (minimum 40 cm) if grown potted, though hollyhocks perform best planted directly in garden borders
Care Schedule
Fertilize
Every 30 days
What Is Hollyhock and Where Does It Come From?
Alcea is a genus of about 60-80 tall, showy flowering plants in the mallow family (Malvaceae), native to southwestern and central Asia and southeastern Europe. The most widely cultivated species, Alcea rosea, is a beloved cottage-garden classic prized for its towering flower spikes, which can reach 2-3 m and bear large, saucer-shaped blooms in shades of pink, red, white, yellow, purple, and near-black. Hollyhocks are typically grown as biennials or short-lived perennials, flowering in their second year before often self-seeding. They are a favorite backdrop plant for cottage borders, fences, and walls.
How to Propagate Hollyhock?
Seed sowing
Hollyhocks readily self-seed once established, so an initial planting often perpetuates itself in the garden for years.
- 1 Sow seeds directly in the garden or in trays in late spring to early summer
- 2 Press seeds lightly into moist, well-drained soil - light aids germination so avoid burying deeply
- 3 Keep soil consistently moist until seedlings emerge
- 4 Thin or transplant seedlings 30-45 cm apart once they have 2-3 true leaves
- 5 Plants typically flower in their second year
Materials needed:
How Big Does Hollyhock Grow?
TLDR: Hollyhock can reach up to 2.5m tall with Fast growth rate.
Max height
2.5m
Spread
60cm
Growth rate
Fast
Foliage
Deciduous
Plant Uses
Ornamental
Great for decoration
Medicinal Uses
- Traditionally used in folk medicine as a soothing, mucilage-rich remedy for coughs and skin irritation
Culinary Uses
- Flowers are edible and used as a garnish or infused for a mild-flavored tea
Is your plant showing symptoms?
Click on the symptom to discover possible causes:
What Diseases Commonly Affect Hollyhock?
TLDR: Hollyhock is susceptible to 8 known diseases. Monitor regularly for early detection.
Rust
Rust is a common fungal disease caused by fungi in the order Pucciniales that affects a wide variety of plants. The disease gets its name from the characteristic orange, yellow, or reddish-brown pustules that appear on leaves, resembling metal rust. This obligate fungal parasite requires living plants to survive and can cause significant economic losses in agricultural crops.
Powdery Mildew
Powdery mildew is a common fungal disease caused by various fungi species including Erysiphe, Podosphaera, Oïdium, and Leveillula. It affects over 10,000 plant species worldwide. The disease thrives in warm, dry climates with high humidity and appears as a distinctive white powdery coating on plant surfaces.
Leaf Spot
Leaf spot is a common fungal disease caused by various pathogens including Alternaria, Ascochyta, Colletotrichum, Septoria, and Venturia. It primarily affects leaves, causing discolored spots that can lead to premature leaf drop if left untreated.
Anthracnose
Anthracnose is a fungal disease caused by fungi in the genus Colletotrichum that affects many plants, including vegetables, fruits, and trees. The disease thrives in cool, wet conditions, causing dark, sunken lesions on leaves, stems, flowers, and fruits.
Meaning & Symbolism
Ambition and fruitfulness in the language of flowers; long a symbol of old-fashioned cottage gardens and English country charm
Fun Facts
Hollyhocks can tower over 2.5 m tall, making them one of the tallest classic garden flowers
The flowers, buds, and young leaves are all edible and were historically used in folk remedies
Hollyhocks are a host plant for the painted lady butterfly caterpillar
Their name comes from Old English "holy" and "hoc" (mallow), reflecting a long association with sacred and healing gardens
Frequently asked questions
How tall do hollyhocks grow?
Are hollyhocks toxic to pets?
Why do my hollyhock leaves have orange spots?
Are hollyhocks annual, biennial, or perennial?
Compare with similar plants
| Attribute | Difficulty | Light | Watering | Pet Safe |
|---|---|---|---|---|
| Dark Fieldcap | Medium | Low light | 2d | ⚠️ |
| Azalea | Medium | Partial shade | 3d | ⚠️ |
| Muriel's Bamboo | Medium | Partial shade | 3d | ✓ |
| Bougainvillea | Medium | Direct sun | 7d | ⚠️ |
