Zinnia Growing Guide

All you need to know to grow successfully!

Plant Family:
Plant Type:
Growing Difficulty:
Typical Zones Grown In:
3, 4, 5, 6, 7, 8, 9, 10

Planting Depth:

6-12 mm
Maturity Time:
8-10 weeks
Companion Plants:

Planting Guidelines

The following are general guides to follow. However, nothing is set in stone. Feel free to experiment!

How to Start:
Direct Sow or Start Indoors if you want an extra challenge
When to Direct Sow:
March, April, May, June, July, August, September, October
Sprouting Time:
5-24 days
Spacing (cm):
Row Spacing (cm):
12-18 inches

Square Foot Spacing:

4 Plants
Sun Exposure:
Full Sun
Typical Season:
When To Harvest:
May, June, July, August, September, October
How to Harvest:
Cut flowers when blooming

Tips to Growing Organically

Growing without the use of pesticides and herbicides is easier than you may think and it’s better for the environment!

Companion Plants:
Common Pests:
Thrips, Aphids
Common Disease:
Powdery Mildew, Alternaria Leaf Blight, Damping-off
Bonus Grow Tips:
Plant in full sun, keep soil moist

Zinnia is a flowering plant that belongs to the family Asteraceae, native to North America, Central America, and South America. It is an annual plant that can reach up to 3 feet in height and produces a variety of colourful flowers, including red, pink, orange, yellow, and purple. Zinnias are popular garden plants due to their long blooming period, ease of cultivation, and attractive flowers, which make excellent cut flowers for bouquets and floral arrangements. They are also used in butterfly gardens, as they attract a variety of butterfly species.

How to Grow Zinnia Organically

  1. Choose a planting site: Zinnias prefer full sun and well-drained soil. Choose a site that receives at least 6 hours of direct sunlight per day.
  2. Prepare the soil: Amend the soil with compost or other organic matter to improve fertility and drainage. Zinnias prefer soil that is slightly acidic with a pH between 5.5 and 7.5.
  3. Plant the seeds: Zinnias can be started from seed indoors 4-6 weeks before the last frost date or sown directly in the garden after the danger of frost has passed. Sow the seeds 1/4 inch deep and 6-12 inches apart.
  4. Water the plants: Zinnias need regular watering to thrive, especially during dry periods. Water deeply and regularly, being careful not to overwater.
  5. Fertilize the plants: Zinnias benefit from regular fertilization to promote healthy growth and abundant blooms. Use a balanced fertilizer according to package instructions.
  6. Deadhead the flowers: Zinnias will continue to bloom all season if the spent flowers are regularly removed. Pinch or cut off the faded flowers to encourage new blooms.
  7. Monitor for pests and diseases: Zinnias can be affected by pests such as aphids and diseases such as powdery mildew. Monitor your plants regularly and take action if you notice any signs of damage or disease.

By following these basic steps, you can grow your own colourful zinnias. Zinnias are great for attracting pollinators like bees and butterflies to your garden and are a popular choice for cut flower arrangements.

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