Sweet Pea 'Castlewellan'

At a Glance

Sweet Pea ‘Castlewellan’

Quick Facts

• Botanical Name: Lathyrus odoratus
• Classification: Spencer
• Petal Pattern: Flush / Solid
• Color Profile: Salmon pink over a cream ground
• Fragrance: Mild to moderate
• Breeder: Harrod
• Year Introduced: 2005
• Flowering Type: Summer-flowering (Long-day)

Overview

Brought to the horticultural market by Harrod in 2005, this breathtaking cultivar is highly prized in the professional floral industry. It produces generously sized flowers featuring a warm cream canvas beautifully washed with soft salmon pink. Because of this romantic and sophisticated coloration, it has become an absolute staple for florists designing elegant wedding arrangements and bridal bouquets. You may also occasionally find this exact same genetic stock circulated in the trade under its commercial synonym, 'Harlow Carr'.

Growth Habit

Exhibiting the classic, robust traits of the Spencer family, this energetic vine requires a sturdy vertical trellis to accommodate its tall, vigorous climbing nature. It is particularly valued by floral enthusiasts for its ability to reliably generate long, straight stems that perfectly display its large, ruffled blossoms. As a summer-blooming plant, it relies heavily on the prolonged daylight hours of the season—typically twelve hours or more—to successfully trigger its prolific flowering phase.

Cultivation Notes

To guarantee the strongest and deepest root system, you should always start your seeds in tall, narrow cells or rootrainers rather than shallow flats. When the young vines reach approximately four to six inches in height, carefully snip off the main growing tip. This critical pruning step forces the plant to push out robust, productive lateral vines from its base, ultimately giving you a much sturdier and higher-yielding plant.

Because ideal planting windows vary drastically based on your local climate, be sure to use our Custom Zip-Code Planting Tool to identify the optimal sowing week for your specific region. (Note: Sweet pea seeds are toxic if ingested, so always exercise caution when planting around children and pets).

Historical Notes

Introduced during the early twenty-first century, 'Castlewellan' highlights the modern breeding focus on producing exquisite, pastel-toned Spencer varieties catered specifically to the high-end floristry market. The fact that it was also given the synonymous name 'Harlow Carr' (a nod to the famous Royal Horticultural Society garden) reflects its esteemed status and widespread appeal among British growers shortly after its release.

In the Garden

‘Castlewellan’ is frequently grown for:

• Crafting romantic bridal bouquets and premium commercial floral designs
• Supplying a reliable harvest of large, long-stemmed Spencer blooms for the vase
• Adding soft, salmon-and-cream pastel tones to garden fences and trellises

Companion Planting Notes

To create a highly textured, slightly rustic floral arrangement, this variety looks absolutely spectacular when styled alongside dried botanical elements such as poppy seedheads, wild raspberry sprigs, mullein, sorrel, vervain, and trailing honeysuckle branches. When blended with other sweet peas, its warm salmon tones harmonize beautifully with varieties like 'Charles Unwin' or the fresh, citrus-scented 'Piggy Sue'.