Physostegia virginiana 'Alba'

Physostegia virginiana 'Alba'

A graceful perennial with elegant white flower spikes that bring brightness and vertical interest to the summer border.

Physostegia virginiana 'Alba', commonly known as the Obedient Plant, produces tall spires of pristine white tubular flowers from mid to late summer. The blooms open gradually from the base upwards, creating a long-lasting display that is highly attractive to bees, butterflies and other pollinating insects. Its clean white flowers provide a cooling contrast to brighter colours and blend effortlessly into both cottage garden and contemporary planting schemes.

Thriving in full sun or partial shade, this robust perennial forms upright clumps of fresh green foliage and flowers reliably year after year. It enjoys moisture-retentive soil but is adaptable to a range of garden conditions once established. The strong vertical flower spikes add valuable structure amongst softer, more billowing perennials.

Specifications

• Height: 80–120cm

• Spread: 45–60cm

• Flowering Period: July to September

• Position: Full sun or partial shade

• Soil: Moist but well-drained soil

• Maintenance: Cut back spent stems in autumn or leave for winter interest, divide every few years if required

• Hardiness: Fully hardy

• Pollinator Friendly: Yes

Note for Isle of Wight Planting

Physostegia 'Alba' performs particularly well in Isle of Wight gardens where it benefits from the island's mild climate and reliable summer warmth. Its white flowers glow beautifully in evening light and help brighten mixed borders from midsummer onwards.

Ideal Companion Plants from The Green Standard Range

• Salvia 'Black and Blue' – dramatic dark stems and cobalt-blue flowers create a striking contrast

• Sanguisorba 'Tanna' – delicate burgundy flowers add texture without competing for attention

• Panicum 'Straight Cloud' – airy flower panicles soften the upright white spires

• Gaura 'The Bride' – elegant white flowers create a relaxed, naturalistic planting

• Verbena bonariensis – transparent purple flowers weave effortlessly through the display

• Helenium 'Moerheim Beauty' – rich copper-red flowers provide warmth against the crisp white blooms

🌟 The Green Standard Tip

Plant Physostegia 'Alba' towards the middle of a border where its vertical flower spikes can emerge through surrounding perennials. It is particularly effective when repeated in groups of three or more for a stronger visual impact.