Sweet Pea Nimbus

At a Glance

Sweet Pea ‘Nimbus’
Lathyrus odoratus

Quick Facts

• Classification: Spencer
• Petal Pattern: Stripe / Flake
• Color Profile: Dark purple-blue striping and inky blue flaking over a silvery ground
• Fragrance: Mild to moderate fragrance
• Breeder: Unwins
• Year Introduced: 1996
• Flowering Type: Long-day / summer flowering

Overview

Introduced in 1996 by the historic British seed house Unwins, Nimbus is considered one of the most recognizable striped Spencer sweet peas of the late twentieth century. Its dramatic combination of deep blue-purple markings against a pale silvery background gives the variety an almost hand-painted appearance, particularly in soft evening light.

Botanically, Nimbus belongs to the Spencer class, distinguished by large waved petals, vigorous climbing growth, and elongated stems. The flowers display both striping and flaking — irregular pigment markings that developed through generations of sweet pea selection and mutation breeding.

Growth Habit

Like many Spencer cultivars, Nimbus is vigorous and capable of producing substantial vine growth under cool growing conditions. Plants develop long stems suitable for cutting and exhibition culture, particularly when grown with consistent moisture and vertical support.

The variety is generally considered summer flowering and responds to increasing day length before initiating abundant bloom production.

Cultivation Notes

Nimbus benefits from early sowing in climates with hot summers, as high temperatures during bud formation may contribute to reduced flowering performance or bud drop. In mild winter regions, autumn sowing often produces the strongest spring displays.

The variety develops a substantial taproot early in growth and responds well to deep containers during the seedling stage.

Historical Notes

By the late twentieth century, striped and flaked sweet peas such as Nimbus represented a continuation of the fascination with unusual color patterning that had existed since the early years of sweet pea breeding. Varieties displaying painterly pigmentation were especially prized by collectors and exhibition growers for their individuality and dramatic visual effect.

In the Garden

Nimbus is often grown for:

• exhibition culture
• cut flower production
• collector gardens
• dramatic color contrast in arrangements

The muted silver undertones pair particularly well with smoky mauves, deep plums, and antique-toned garden palettes.