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How to Plant Zinnia Seeds - Gardeners Basics

How to Plant Zinnia Seeds - Gardeners Basics

Jeena Lugo Jeena Lugo
7 minute read

Hello fellow gardeners! As a passionate gardener, I adore growing flowers that bring color and joy to my garden. One of my favorites is the vibrant and easy-to-grow zinnia. In this article, I will provide an in-depth, step-by-step guide on how to plant zinnia seeds and help you create a stunning flower garden.

Table of Contents

  1. Introduction to Zinnias
  2. Important Zinnia Plant Characteristics
  3. Preparing Your Garden Bed
  4. Starting Seeds Indoors 4 to 6 Weeks Before the Last Frost
  5. Transplanting Zinnia Seedlings
  6. Direct Sowing Zinnia Seeds
  7. Caring for Your Zinnias
  8. Harvesting and Enjoying Your Zinnias

Introduction to Zinnias

Zinnias are native to Mexico and belong to the Asteraceae family. They are known for their dazzling, daisy-like flowers that come in various colors, depending on the variety. Zinnias are not only easy to grow but also make excellent cut flowers to brighten up your home.

Zinnia Seeds for Outdoor Planting | 5 Variety Pack

Zinnia Seeds for Outdoor Planting | 5 Variety Pack


The 5 Variety Pack Zinnia Seeds by Gardeners Basics is a perfect addition to any garden. This pack includes Thumbelina, Lilliput, Envy, Purple Prince, and Pompon Varieties, all known to attract butterflies, bees, and other pollinators to your garden. Zinnias… read more

Important Zinnia Plant Characteristics

  • History of the Seed: Native to Mexico and South America, zinnias have been cultivated for centuries.
  • Days till maturity: Approximately 60 to 70 days, depending on the variety.
  • Planting depth: 1/4 to 1/2 inch deep.
  • Plant spacing: 9 to 18 inches apart, depending on the variety, to maximize air circulation.
  • Days to germination: 7 to 14 days.
  • Start indoors or direct sown: Both options work well for zinnias, but starting seeds indoors 4 to 6 weeks before the last frost can give you a head start.
  • Full sun or partial shade: Plant zinnias in full sun for best results.
  • When to harvest: When the flowers are fully open, typically 60 to 70 days after planting.
  • How tall does the plant get: 8 to 48 inches tall, depending on the variety.
  • How wide does the plant get: 12 to 18 inches wide.
  • Native: Mexico and South America.
  • Family: Asteraceae.
  • Annual:  Zinnia plants are annual flowers.

Preparing Your Flower Garden Bed

Before planting your zinnia seeds, preparing the garden bed is essential to follow these steps to create the ideal environment for your zinnias:

  1. Choose a location with full sun and good air circulation to prevent diseases.
  2. Clear the area of weeds, rocks, and debris.
  3. Amend the soil with compost or well-rotted manure to improve soil structure and provide necessary nutrients.
  4. Check the soil pH; Zinnias flowers prefer a slightly acidic to neutral pH of 6.0 to 7.0. Adjust the pH if necessary.
  5. Rake the soil to create a smooth and level surface.

Starting Seeds Indoors 4 to 6 Weeks Before the Last Frost

To give your zinnias a head start, you can start seeds indoors in the weeks before the last frost. Follow these steps to successfully grow zinnia seedlings indoors:

  1. Fill seed trays or small pots with a high-quality seed-starting mix.
  2. Sow zinnia seeds 1/4 to 1/2 inch deep and gently cover them with the seed-starting mixture.
  3. Water the seeds gently but thoroughly, ensuring the soil remains consistently moist but not soggy.
  4. Place the seed trays in a warm location (70-75°F) with good air circulation. A heat mat can help maintain consistent temperatures.
  5. Monitor soil moisture and water as needed to prevent the soil from drying.
  6. Once the seedlings reach 2-3 inches tall and have at least two sets of true leaves, begin to acclimate them to outdoor conditions by gradually exposing them to outdoor temperatures and sunlight oover7-10 days.

Transplanting Zinnia Seedlings

After your zinnia seedlings have been hardened off and the risk of frost has passed, it's time to transplant them into your prepared garden bed. Follow these steps for successful transplanting:

  1. Space the seedlings 9 to 18 inches apart, depending on the variety, to allow for good air circulation and growth.
  2. Dig a hole slightly larger than the root ball of each seedling.
  3. Carefully remove the seedlings from their pots, ensuring not to damage the roots.
  4. Place each seedling in a hole, with the top of the root ball level with the soil surface.
  5. Fill in the holes with soil and gently firm it around the base of each seedling.
  6. Water the transplanted seedlings thoroughly to settle the soil and establish good root-to-soil contact.

Direct Sowing Zinnia Seeds

You can also sow zinnia seeds directly in your prepared garden bed after the average last frost date has passed. Follow these steps to direct sow your zinnia seeds:

  1. Sow zinnia seeds 1/4 to 1/2 inch deep, spacing them about 2 inches apart.
  2. Gently cover the seeds with soil and water the area thoroughly.
  3. Keep the soil consistently moist but not soggy during germination, which typically takes 7 to 14 days.
  4. Thin the seedlings to their final spacing of 9 to 18 inches apart once they reach 2-3 inches tall.

Caring for Your Zinnia Flowers

Once your zinnias are established, follow these care tips to ensure healthy growth and beautiful blooms:

  1. Water your zinnias deeply and consistently, providing about 1 inch per week. Avoid overhead watering to minimize the risk of diseases.
  2. Mulch around the base of the plants to conserve soil moisture and suppress weeds.
  3. Fertilize your zinnias with a balanced, slow-release, or liquid fertilizer according to the package instructions.
  4. Deadhead spent blooms to encourage continuous flowering and maintain a tidy appearance.
  5. Monitor your zinnias for pests and diseases, and address any issues promptly.

Harvesting and Enjoying Your Zinnias

Zinnias make excellent cut flowers that can brighten your home or be shared with friends and family. Follow these tips for harvesting and enjoying your zinnias:

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Zinnia Dahlia Flowered Mix Seeds


Introducing the Zinnia Dahlia Flowered Mix, an excellent addition to any garden! With fully double, 4-5 inch wide flowers that resemble dahlias, this annual species is sure to impress. Native to Mexico, these plants are fast-growing and long-blooming, producing an… read more

  1. Harvest zinnia flowers when fully open, typically 60 to 70 days after planting.
  2. Use clean, sharp scissors or pruners to cut the flower stems at an angle, preferably in the early morning or evening when temperatures are cooler.
  3. Remove any leaves submerged in water to reduce the risk of bacterial growth.
  4. Place the cut flowers in a vase with fresh water and flower food or a homemade solution to prolong their vase life.
  5. Change the water in the vase every few days and recut the stems at an angle to encourage water uptake. 6. Display your zinnias in a cool location away from direct sunlight and drafts to maximize longevity.

By following this comprehensive step-by-step guide, you'll be well on your way to successfully growing stunning zinnias in your flower garden. These easy-to-grow flowers add a burst of color to your outdoor space and make excellent cut flowers to brighten up your home. Enjoy planting flower seeds and nurturing your zinnias, and share the beauty of these vibrant flowers with those around you. Happy gardening!

How to Plant Zinnia SeedsFAQ: How to Plant Zinnia Seeds

Here are some frequently asked questions and answers for growing zinnia flowers from seeds.

Q: When is the best time to plant zinnia seeds?

A: Zinnia seeds should be planted after the last frost date in your area. In most regions, this will be in the spring, but seeds can be planted in warmer climates in the fall.

Q: How do I prepare the soil for planting zinnia seeds?

A: Zinnias prefer well-draining soil with a pH between 5.5 and 7.5. Work the ground to a 6-8 inches depth and mix in compost or other organic matter to improve drainage and fertility.

Q: How deep do I plant zinnia seeds?

A: Zinnia seeds should be planted ¼ to ½ inch deep.

Q: How far apart should I space zinnia seeds?

A: Space zinnia seeds 6-18 inches apart, depending on the variety.

Q: How often should I water zinnia seeds?

A: Zinnia seeds should be kept evenly moist but not waterlogged. Water when the top inch of soil is dry.

Q: How long does it take for zinnia seeds to germinate?

A: Zinnia seeds typically germinate in 5-10 days.

Q: How long does it take for zinnias to bloom?

A: Zinnias typically bloom 6-8 weeks after planting.

Q: How often should I fertilize zinnias?

A: Zinnias benefit from monthly fertilization during the growing season. Use a balanced fertilizer with equal nitrogen, phosphorus, and potassium.

Q: How do I deadhead Zinnias?

A: To encourage more blooms, pinch off the faded flowers at the base of the stem.

Q: How do I save zinnia seeds?

A: Allow the flowers to dry on the plant and collect the seed heads when brown and crispy. Remove the seeds from the seed heads and store them in a cool, dry place until planting season.

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