Asteraceae
Zinnia Care and Growing Guide
Zinnia
An easy, rewarding annual, zinnia needs full sun, well-draining soil, and regular watering at the base. Once established it tolerates short dry spells and rewards minimal care with nonstop color all summer.
Every 7 days
Direct sun
15° - 32°C
% - %
Categories
What is Zinnia?
Zinnia (Zinnia) is a easy-care plant from the Asteraceae family. Zinnia is a genus of annual flowering herbs in the daisy family (Asteraceae), native to Mexico and the southern United States. Prized for their bold, long-lasting blooms in single, semi-double, or double forms, zinnias flower profusely from summer through the first frost in colors ranging from red a...
Zinnia grows up to 90cm, spread of 30cm, watering every 7 days, 15°C – 32°C. It is not suitable for indoor environments and safe for pets.
Unlike many tropical plants, Zinnia tolerates watering mistakes. Best for beginners. Unlike many popular species, Zinnia is safe to keep around pets.
How to Care for Zinnia?
TLDR: Zinnia needs Direct sun, watering every 7 days, and temperatures between 15-32°C with 40-70% humidity.
How Often Should You Water Zinnia?
Water deeply about once a week at the base of the plant, preferably in the morning, avoiding wetting the foliage to reduce the risk of powdery mildew and leaf spot.
How Much Light Does Zinnia Need?
Give zinnias at least 6 to 8 hours of direct sun daily; partial shade causes leggy stems and fewer flowers.
What Is the Best Soil for Zinnia?
Zinnias prefer fertile, well-draining soil with a pH between 6.0 and 7.0. Heavy, waterlogged soil encourages root rot.
What Pot Should You Use for Zinnia?
Choose wide, shallow containers with good drainage holes, since zinnias have shallow roots; fill with a light, compost-enriched potting mix.
Care Schedule
Fertilize
Every 30 days
What Is Zinnia and Where Does It Come From?
Zinnia is a genus of annual flowering herbs in the daisy family (Asteraceae), native to Mexico and the southern United States. Prized for their bold, long-lasting blooms in single, semi-double, or double forms, zinnias flower profusely from summer through the first frost in colors ranging from red and orange to pink, yellow, purple, and white.
How to Propagate Zinnia?
Seed sowing
Avoid transplanting large seedlings since zinnias resent root disturbance; direct sowing gives the best results.
- 1 Direct-sow seeds about 1/4 inch (0.5 cm) deep after the last frost date.
- 2 Keep the soil consistently moist until germination, which takes 4 to 7 days.
- 3 Thin seedlings to 12 inches (30 cm) apart once true leaves appear.
- 4 Expose seedlings to full sun as soon as they are established.
Materials needed:
How Big Does Zinnia Grow?
TLDR: Zinnia can reach up to 90cm tall with Fast growth rate.
Max height
90cm
Spread
30cm
Growth rate
Fast
Plant Uses
Ornamental
Great for decoration
Is your plant showing symptoms?
Click on the symptom to discover possible causes:
What Diseases Commonly Affect Zinnia?
TLDR: Zinnia is susceptible to 8 known diseases. Monitor regularly for early detection.
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.
Alternaria Leaf Spot
Alternaria leaf spot is a common fungal disease caused by Alternaria solani and Alternaria alternata that affects a wide range of plants including tomatoes, potatoes, brassicas, and ornamentals. The disease thrives in warm, humid conditions and can cause significant crop damage if left untreated. Spores overwinter on plant debris and can attach to seeds, making complete elimination difficult.
Bacterial Leaf Spot
Bacterial leaf spot is a plant disease caused by bacteria in the Xanthomonas and Pseudomonas genera that affects various ornamental and edible plants. The bacteria infect leaves through wounds or natural openings, causing characteristic lesions that can lead to premature leaf drop and plant weakening.
Cercospora Leaf Spot
Cercospora leaf spot is a common fungal disease caused by Cercospora species that affects many plant types, particularly beets, roses, and leafy vegetables. The disease thrives in warm, humid conditions and can cause significant defoliation, reducing plant vigor and yield. It spreads rapidly through water splash, wind, and contaminated tools.
Meaning & Symbolism
In the language of flowers, zinnias symbolize lasting affection and remembrance of absent friends, making them a traditional token of enduring friendship.
Fun Facts
The genus is named after German botanist Johann Gottfried Zinn, who first described it in the 18th century.
Zinnias were cultivated in Mexico by pre-Columbian peoples long before Europeans arrived.
NASA grew zinnias aboard the International Space Station in 2016 as part of plant growth experiments in microgravity.
Frequently asked questions
Are zinnias toxic to cats and dogs?
How often should I water zinnias?
Why does my zinnia have white powder on its leaves?
How do you propagate zinnias?
How long do zinnias bloom?
Compare with similar plants
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|---|---|---|---|---|
| Field Maple | Easy | Bright indirect | 14d | ✓ |
| Silver Birch | Easy | Direct sun | 14d | ✓ |
| Common Blanketflower | Easy | Direct sun | 10d | ✓ |
| Cushion Bush | Easy | Direct sun | 14d | ✓ |
