Updated: May 12, 2024

Annual phlox, also known as Phlox drummondii, is a beautiful flowering plant that can brighten up any indoor space with its vibrant blooms. This hardy annual is relatively low-maintenance and can thrive indoors as long as it receives the right care and conditions. In this article, we will discuss how you can successfully grow annual phlox flowers indoors to enjoy their beauty all year round.

Choosing the Right Variety

There are many varieties of annual phlox flowers available, each with its unique colors and characteristics. When choosing a variety to grow indoors, consider factors such as the size of the plant, bloom color, and fragrance. Some popular varieties of annual phlox include:

  • Cherry Caramel: This variety features striking cherry red blooms with a sweet fragrance.
  • Twinkle Mix: Twinkle Mix phlox produces delicate, star-shaped flowers in a range of colors including pink, purple, and white.
  • Sugar Stars: Sugar Stars phlox has compact growth habit and produces clusters of white flowers with a sweet scent.

Choose a variety that appeals to your taste and complements your indoor décor.

Planting Annual Phlox Seeds

Growing annual phlox flowers from seeds is a rewarding experience that allows you to witness the entire growth process. Here are some steps to follow when planting annual phlox seeds indoors:

  1. Prepare the Seed Trays: Fill seed trays or small pots with well-draining potting soil. Moisten the soil before planting the seeds.

  2. Sow the Seeds: Place the annual phlox seeds on top of the soil and gently press them down. Cover the seeds lightly with a thin layer of soil.

  3. Provide Adequate Light: Annual phlox plants require plenty of sunlight to thrive. Place the seed trays in a sunny location or under grow lights for at least 6-8 hours per day.

  4. Maintain Moisture: Keep the soil consistently moist but not waterlogged. Water the seeds gently using a spray bottle to avoid displacing them.

  5. Germination Period: Annual phlox seeds typically germinate within 7-14 days. Once the seedlings emerge, thin them out to allow for proper spacing.

Caring for Indoor Annual Phlox Plants

Once your annual phlox plants have grown and started blooming, it is essential to provide them with proper care to ensure continued growth and flowering. Here are some tips for caring for indoor annual phlox plants:

  • Watering: Water the plants regularly, keeping the soil evenly moist but not soggy. Allow excess water to drain out of the pot to prevent root rot.

  • Fertilization: Feed your annual phlox plants with a balanced liquid fertilizer every 2-4 weeks during the growing season to promote healthy growth and abundant blooms.

  • Deadheading: Remove spent flowers regularly to encourage continuous blooming and prevent seed formation.

  • Pest Control: Keep an eye out for common pests such as aphids or spider mites and treat them promptly with insecticidal soap or neem oil.

  • Pruning: Trim back leggy stems and remove any yellowing or diseased foliage to maintain the plant’s overall health and appearance.

Providing Ideal Growing Conditions

To help your indoor annual phlox plants thrive, it is essential to create optimal growing conditions for them. Here are some factors to consider:

  • Light: Annual phlox plants prefer bright, indirect light. Place them near a sunny window where they can receive ample sunlight without being exposed to direct sunlight.

  • Temperature: Maintain a consistent temperature range of 60-75°F (15-24°C) for your annual phlox plants. Avoid placing them near drafts or heat sources that can stress the plants.

  • Humidity: Annual phlox plants thrive in moderate humidity levels. In dry indoor environments, consider using a humidifier or placing a tray of water near the plants to increase humidity.

  • Air Circulation: Ensure good air circulation around your plants to prevent issues such as mold or mildew. Use a fan on low speed if necessary.

By providing your indoor annual phlox plants with the right care and conditions, you can enjoy their beautiful blooms and fragrance throughout the growing season. With proper attention to watering, fertilizing, and pest control, you can cultivate healthy and vibrant annual phlox flowers that will enhance your indoor space with their charm and elegance. Whether you choose a single variety or a mix of different colors, growing annual phlox flowers indoors can be a delightful experience for any gardening enthusiast.