Phlox Seeds – Grandiflora Tall Mix | Phlox drummondii | WINTER

Phlox Grandiflora Tall Mix belongs to Phlox drummondii, an annual flowering species from the Polemoniaceae family.

It develops upright, branching stems carrying clusters of comparatively:

Large, colourful and lightly fragrant flowers.

Grandiflora types are valued for their:

Larger blooms and taller flowering stems

compared with compact bedding Phlox varieties.

Plants commonly grow to approximately:

40–50 cm / 16–20 inches tall

depending on variety and growing conditions.

Grandiflora Mix is particularly useful for:

Borders, flower beds, mass displays and cut-flower arrangements.

Commercial Grandiflora strains are commonly listed at around 45 cm tall and are used both as bedding and cut flowers.

Key Features

• Botanical name: Phlox drummondii
• Variety: Grandiflora Tall Mix
• Common name: Annual Phlox
• Cool-season annual
• Large colourful flowers
• Mixed flower colours
• Upright and branching growth
• Approximate height: 40–50 cm
• Lightly fragrant flowers
• Suitable for cut flowers
• Excellent for flower beds
• Suitable for borders
• Suitable for pots and grow bags
• Full-sun plant
• Excellent winter flowering plant for Pakistan

Recommended Grow Bags

G-11 Grow Bag – 11 × 10 inch 🔗

Suitable for:

A small group of Phlox plants.

G-12 Grow Bag – 12 × 12 inch 🔗

Recommended for a fuller group of Grandiflora Tall Phlox plants.

G-24 Grow Bag – 24 × 12 inch 🔗

Excellent for:

Growing several plants together for a broader mass-flowering display.

Recommended Soil / Potting Mix

Use:

60% Bhalu Mitti / Sandy Soil + 30% GREEN GARDENS Vermicompost 🔗 + 10% Cocopeat

The growing medium should be:

Loose, fertile and well-draining.

Phlox benefits from fertile soil but should never remain continuously waterlogged.

Avoid:

• Heavy compact soil
• Poor drainage
• Standing water
• Continuously saturated soil
• Excessive nitrogen fertilizer

Growing Instructions from Seeds

Phlox Grandiflora Tall Mix can be:

Direct sown or started carefully in seedling trays.

Sow seeds approximately:

0.3–0.5 cm / about ⅛ inch deep.

Cover with a thin layer of fine growing medium.

Water gently after sowing.

Keep the growing medium:

Lightly and consistently moist until germination.

Important Sowing Note

Phlox seeds should be:

Lightly covered rather than left completely exposed.

A covering of approximately:

2–3 mm / around ⅛ inch

of fine growing medium is suitable.

Do not bury the seeds deeply.

Some commercial Phlox drummondii growing guidance specifically uses covered seed and germination under dark conditions.

Germination

Seeds generally germinate within:

7–14 days

under suitable conditions.

Good germination depends on:

• Suitable cool-to-moderate temperature
• Consistent moisture
• Correct sowing depth
• Fine growing medium
• Good drainage
• Seed freshness

Avoid:

Allowing the growing medium to dry completely or remain continuously wet.

Commercial Grandiflora Phlox guidance commonly reports germination within approximately 7–14 days under suitable conditions.

Ideal Germination Temperature

Recommended germination temperature:

Approximately 15–20°C

A temperature near:

15–18°C

is particularly suitable where conditions can be controlled.

Grandiflora seed references indicate germination around 15°C, while other commercial guidance uses approximately 18–20°C.

Transplanting

If seeds are started in trays:

Transplant seedlings while they are still young and easy to handle.

Move them after they have developed approximately:

2–3 true leaves.

Handle roots carefully because Phlox does not benefit from unnecessary root disturbance.

After transplanting:

Water gently and protect the seedlings from severe stress until established.

Plant Spacing

Maintain approximately:

20–25 cm / 8–10 inches between plants

for home garden cultivation.

Adequate spacing encourages:

Healthy branching, better airflow and stronger flowering stems.

Closer spacing may create a denser display, while slightly wider spacing improves airflow.

Sunlight

Provide:

Full sun.

Approximately:

6+ hours of direct sunlight daily

is recommended during the winter growing season.

Good winter sunlight encourages:

Compact growth, stronger stems and abundant flowering.

Watering

Keep young seedlings:

Moderately and consistently moist during establishment.

After plants become established:

Water when the upper soil layer begins to dry.

Avoid:

Standing water and continuously saturated growing media.

Deep but sensible watering is preferable to frequent excessive watering.

Feeding

At planting time, incorporate a moderate amount of:

GREEN GARDENS Vermicompost 🔗

into the growing medium.

Phlox performs well in:

Fertile soil containing adequate organic matter.

During active growth and flowering:

Light balanced feeding may be provided when required.

Avoid excessive nitrogen fertilizer because it may encourage:

Excessive leafy growth at the expense of flowers.

Flowering & Maintenance

Phlox Grandiflora Tall Mix produces:

Large colourful flower clusters on upright stems.

For a longer and healthier flowering display:

• Provide full sun
• Maintain moderate soil moisture
• Maintain good drainage
• Avoid overcrowding
• Avoid excessive nitrogen
• Remove faded flowers regularly

Deadheading spent flowers

helps maintain a neat appearance and may encourage continued blooming.

Because Grandiflora Tall produces relatively long flowering stems, blooms can also be harvested for:

Vases and cut-flower arrangements.

Related Products

G-11 Grow Bag – 11 × 10 inch 🔗

G-12 Grow Bag – 12 × 12 inch 🔗

G-24 Grow Bag – 24 × 12 inch 🔗

GREEN GARDENS Vermicompost 🔗

Winter Flower Seeds 🔗

Growing Guide Videos – Gardening with Javed Iqbal 🔗