Lathyrus Mammoth Navy Blue, also known as Lathyrus odoratus, is a vigorous climbing annual with Mediterranean roots. Part of the professional "Mammoth" series, this variety is prized for its large, ruffled, deep velvety navy blooms and an intoxicatingly sweet fragrance. These plants can reach a mature height of 60 to 84 inches with support, providing an elegant vertical structure in the landscape or cut flower field. For a sophisticated spring display, pair this navy variety with companions like Ammi majus (Bishop’s Weed), Delphinium (Larkspur), or white snapdragons.
Mammoth Navy Blue Selling Tips
Sell Mammoth Navy Blue to customers looking for dramatic vertical interest and a premium fragrance that defines the early spring garden. This series is highly valued by cut flower enthusiasts because it is less sensitive to day length, allowing for earlier blooms on exceptionally long, sturdy stems. The unique, saturated dark blue color and sweet scent make it a standout choice for romantic bridal work and high-end floral arrangements. Remind your customers that the more they harvest the flowers, the more the plant will bloom, providing them with weeks of fragrant indoor bouquets.
Coach Your Customer Plant in a location that receives full sun to ensure the most profuse blooms and strong, healthy vines. Provide a sturdy support structure, such as a 6-foot trellis, fence, or netting, immediately after planting to accommodate its vigorous climbing habit. Maintain consistent soil moisture and apply mulch around the base of the plant to keep the roots cool, which helps extend the bloom period as the weather warms up. Pick the flowers frequently; removing stems for bouquets actually stimulates the plant to produce even more flowering stems. These are cool-season annuals that thrive in spring temperatures and will naturally begin to fade once the intense heat of mid-to-late summer arrives.
General Growing Tips For Your Seedling Tray
For professional greenhouse production, plant one rooted liner per 4-inch pot or three liners per 10-inch container for a high-impact retail product. Maintain a media pH between 6.0 and 7.0 and provide a balanced fertilizer feed of 150 to 200 ppm Nitrogen. As a cool-weather crop, sweet peas should be finished with daytime temperatures of 55–65°F and night temperatures of 45–50°F to ensure high flower quality and thick stems. While Mammoth types are early bloomers and less day-length sensitive, they still require high light levels to prevent flower bud drop. Finishing time is typically 6 to 8 weeks from transplant for a 4-inch pot.
Pinching
You should pinch the plants once they reach approximately 4 to 6 inches in height to encourage better branching from the base, which significantly increases the total flower yield.
Spacing
For professional cut flower production, space your plants 6 to 12 inches apart. Because Mammoth Navy Blue is a vigorous climber, you must provide mechanical support, such as 6-foot tall netting or wire trellises, to keep the stems straight and prevent the vines from tangling.
Pests
Closely monitor your crop for aphids, thrips, and spider mites.
Disease
The most common issues are powdery mildew and botrytis, particularly when humidity levels are high.
Rooted Cuttings
Cuttings vary in size between different plant families. These rooted starter plants will arrive ready to be transplanted in to your final container. If they are to be used in a landscape application, you will need to establish them in a 4 inch pot or an 1801 before planting outside.
Lathyrus Mammoth Navy Blue Quick Reference Guide
4 Inch crop time
6-8 Weeks
10 Inch crop time
8-10 Weeks
Bloom Period
Spring, Summer
Color
navy blue
Habit
Upright
Height
5-7 Feet
Light
Full Sun
Minimum Temp
60
Perennial Zone
-
Water Needs
Moderate
Patented Plant
No
Current
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4,165
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Lathyrus Mammoth Navy Blue, also known as Lathyrus odoratus, is a vigorous climbing annual with Mediterranean roots. Part of the professional "Mammoth" series, this variety is prized for its large, ruffled, deep velvety navy blooms and an intoxicatingly sweet fragrance. These plants can reach a mature height of 60 to 84 inches with support, providing an elegant vertical structure in the landscape or cut flower field. For a sophisticated spring display, pair this navy variety with companions like Ammi majus (Bishop’s Weed), Delphinium (Larkspur), or white snapdragons.
Mammoth Navy Blue Selling Tips
Sell Mammoth Navy Blue to customers looking for dramatic vertical interest and a premium fragrance that defines the early spring garden. This series is highly valued by cut flower enthusiasts because it is less sensitive to day length, allowing for earlier blooms on exceptionally long, sturdy stems. The unique, saturated dark blue color and sweet scent make it a standout choice for romantic bridal work and high-end floral arrangements. Remind your customers that the more they harvest the flowers, the more the plant will bloom, providing them with weeks of fragrant indoor bouquets.
Coach Your Customer Plant in a location that receives full sun to ensure the most profuse blooms and strong, healthy vines. Provide a sturdy support structure, such as a 6-foot trellis, fence, or netting, immediately after planting to accommodate its vigorous climbing habit. Maintain consistent soil moisture and apply mulch around the base of the plant to keep the roots cool, which helps extend the bloom period as the weather warms up. Pick the flowers frequently; removing stems for bouquets actually stimulates the plant to produce even more flowering stems. These are cool-season annuals that thrive in spring temperatures and will naturally begin to fade once the intense heat of mid-to-late summer arrives.
General Growing Tips For Your Seedling Tray
For professional greenhouse production, plant one rooted liner per 4-inch pot or three liners per 10-inch container for a high-impact retail product. Maintain a media pH between 6.0 and 7.0 and provide a balanced fertilizer feed of 150 to 200 ppm Nitrogen. As a cool-weather crop, sweet peas should be finished with daytime temperatures of 55–65°F and night temperatures of 45–50°F to ensure high flower quality and thick stems. While Mammoth types are early bloomers and less day-length sensitive, they still require high light levels to prevent flower bud drop. Finishing time is typically 6 to 8 weeks from transplant for a 4-inch pot.
Pinching
You should pinch the plants once they reach approximately 4 to 6 inches in height to encourage better branching from the base, which significantly increases the total flower yield.
Spacing
For professional cut flower production, space your plants 6 to 12 inches apart. Because Mammoth Navy Blue is a vigorous climber, you must provide mechanical support, such as 6-foot tall netting or wire trellises, to keep the stems straight and prevent the vines from tangling.
Pests
Closely monitor your crop for aphids, thrips, and spider mites.
Disease
The most common issues are powdery mildew and botrytis, particularly when humidity levels are high.
Rooted Cuttings
Cuttings vary in size between different plant families. These rooted starter plants will arrive ready to be transplanted in to your final container. If they are to be used in a landscape application, you will need to establish them in a 4 inch pot or an 1801 before planting outside.
Lathyrus Mammoth Navy Blue Quick Reference Guide
4 Inch crop time
6-8 Weeks
10 Inch crop time
8-10 Weeks
Bloom Period
Spring, Summer
Color
navy blue
Habit
Upright
Height
5-7 Feet
Light
Full Sun
Minimum Temp
60
Perennial Zone
-
Water Needs
Moderate
Patented Plant
No
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