Species

Phlox paniculataGarden Phlox

65 other cultivars

perennialN. America Native

Garden Phlox 'Delft Blue'

Phlox paniculata 'Delft Blue'

The Story

Plant Bio

Tall and sturdy perennial, known for its abundant flowers.

Unique striking blue blooms, adding a rare color to gardens.

Uses & Benefits:

Provides vibrant blue flowers that attract pollinators, enhancing garden beauty.

Easy to grow and maintain, suitable for cut flower arrangements.

Supports bees and butterflies, contributing to local biodiversity.

SpeciesPhlox paniculataGarden Phlox

Essentials

At a Glance

Plant Type

Perennial

Height

30 inches

Width

18 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Prefers good air circulation

Lifespan

Perennial

Native To

Eastern North America

Toxicity

Non-toxic to humans and pets

Bloom period

Mid-summer – Late summer

In flower about 2 months of the year

Planting

How to Grow

Tuck seeds into well-draining soil in early spring for best germination.
Mist cuttings regularly to maintain humidity and encourage root growth.
Plant in full sun to partial shade for optimal flowering.
Water deeply once a week during dry spells to keep soil moist.
Apply a balanced fertilizer in early spring to promote healthy growth.
Divide clumps every 3-4 years in early spring or fall to rejuvenate.

Pro Tip

Use organic compost to enrich soil for vibrant blooms and healthy plants.

Keep It Thriving

Care Guide

Do

Water regularly, especially during dry periods 💧
Prune after flowering to encourage bushy growth
Mulch around the base to retain moisture and suppress weeds
Fertilize in early spring for best flowering
Monitor for pests and diseases regularly

Don't

Avoid overwatering which can cause root rot ❌
Don’t prune in late fall to prevent frost damage
Refrain from using heavy mulch that suffocates roots
Don’t ignore pest signs—early detection is key
Avoid planting in dense shade for best results

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Divide
Pest Check
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Colorful perennial borderFragrant flower bedWildlife-friendly garden

Companion Plants

Echinacea Rudbeckia CoreopsisLavender Salvia

Multiply

Propagation Methods

Good to Know

Common Questions

Garden Phlox 'Delft Blue' questions

What zones can Garden Phlox 'Delft Blue' grow in?

Garden Phlox 'Delft Blue' is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Garden Phlox 'Delft Blue' deer resistant?

Not reliably. Deer may browse Garden Phlox 'Delft Blue', especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Garden Phlox 'Delft Blue' bloom?

Garden Phlox 'Delft Blue' typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Garden Phlox 'Delft Blue' need full sun?

Garden Phlox 'Delft Blue' does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.