Narrow-Leaved Obedient Plant Seeds – Physostegia angustifolia

Tall Flower Spikes for Sunny, Moist Gardens

Narrow-leaved Obedient Plant (Physostegia angustifolia), also called narrowleaf false dragonhead, is a North American herbaceous perennial with narrow foliage and upright flowering stems. Its pale pink flowers attract bees and hummingbirds, bringing movement and seasonal interest to a natural-style border.

Give it room in a sunny planting with consistent moisture, where its vertical flower spikes can rise among neighboring perennials. This is a spreading plant, best placed where an expanding colony is welcome.

Choose Your Seed Pack

• 30 seeds.
• 100 seeds.
• 500 seeds.
• 2,000 seeds.

This listing is for planting seeds, not live plants or rooted divisions. No named cultivar or specific seed provenance is represented.

Plant Details

• Botanical name: Physostegia angustifolia.
• Common name: Narrow-leaved Obedient Plant.
• Life cycle: Herbaceous perennial.
• Flowers: Typically pale pink, carried on upright spikes; seed-grown plants may vary.
• Mature height: Approximately 3–5 feet, depending on conditions.
• Light: Full sun to light shade. Too much shade can encourage leaning stems.
• Soil: Average to moist soil with drainage; water during dry spells.
• Flowering: Summer into early fall, with timing influenced by climate and growing conditions.

Important: Allow Room to Spread

This species spreads by underground rhizomes and can be vigorous in garden beds. Choose its position carefully, monitor the edges of the planting, and divide clumps as needed. It is better suited to a generous natural-style planting than a tightly packed space where neighboring plants could be crowded.

Starting from Seed

• Fall sowing: Sow outdoors in late fall in a prepared seed bed or protected seed container so winter conditions can provide natural chilling.
• Spring preparation: For spring sowing, mix seeds with a lightly moist medium such as sand and refrigerate for approximately 60 days. Keep moist, not saturated.
• Sowing depth: Sow just below the surface and cover only lightly.
• Moisture: Keep the seed bed lightly moist during germination.
• Patience: Emergence can vary. Do not expect all seeds to germinate at once or assume immediate flowering from young seedlings.

Seedling Care

Provide good light once seedlings emerge and maintain moisture while they establish. Move seedlings carefully into individual pots when large enough to handle. Acclimate protected seedlings gradually before planting outdoors, leaving room for mature growth and access for future division.

Growing in Containers

A large container can offer a more manageable way to grow this spreading perennial, but the tall stems and expanding roots need regular attention.

• Choose stability: Use a substantial pot with drainage holes and room for root development.
• Mix: Use a moisture-retentive but well-draining potting mix.
• Water: Check frequently during warm weather and avoid letting the mix dry out completely.
• Support: Stake stems if needed, especially in exposed positions.
• Manage growth: Check for crowded roots and divide or repot as plants develop. Monitor shoots extending through drainage holes.
• Winter care: Protect containers appropriately for local conditions rather than assuming roots in pots have the same protection as those in the ground.

Seasonal Maintenance

Stems may need support in rich soil or shade. Divide established clumps approximately every 2–3 years to manage spread and crowding. Remove spent flower spikes before seed matures if you want to limit reseeding.

Species identity: This listing is for Physostegia angustifolia, not a named cultivar of the related Physostegia virginiana.