Mammoth Scarlet, also known as Lathyrus odoratus, is a vigorous climbing annual originally native to the Mediterranean region [49, context]. This professional-tier cultivar is part of the "Mammoth" series, specifically bred for the cut flower industry to provide earlier blooms, larger flower sizes, and exceptionally long, sturdy stems. These plants can reach a mature height of 60 to 72 inches with support, producing masses of ruffled, intensely scarlet-red flowers that release a powerful, sweet fragrance from late spring through early summer [context]. Thriving in full sun and rich, well-drained soil, Mammoth Scarlet is a staple for vertical garden displays and premium, high-value cut flower production. For a striking spring arrangement, consider pairing it with companions like larkspur (Delphinium), blue snapdragons, or Ammi majus.
Mammoth Scarlet Selling Tips
Sell Mammoth Scarlet to customers who are looking for high-impact color, premium fragrance, and vertical drama for their spring gardens. The Mammoth series is highly valued because it is less sensitive to day length, allowing it to bloom earlier in the spring and giving your customers a head start on the season. Home gardeners will love the bold look of the scarlet vines climbing up a garden obelisk or trellis, while florists will prize the saturated color and long vase life for high-end spring bouquets. Remind your customers that frequent cutting actually encourages more blooms, providing them with weeks of vibrant, fragrant indoor displays.
Coach Your Customer Plant in a sunny location with rich, well-drained soil as soon as the ground can be worked in the spring, as these plants love cool temperatures. Provide a sturdy trellis, fence, or netting immediately after planting, as these vines need a structure to climb as they grow. Keep the soil consistently moist and apply mulch around the base of the plants to keep the root systems cool as the weather warms up. Pick the flowers often; removing the blooms for bouquets stimulates the plant to produce even more flowering stems. These are cool-season annuals that will eventually decline 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 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. Sweet peas are cool-weather crops, so keep daytime temperatures between 55 and 65°F and night temperatures around 45 to 50°F to ensure thick, strong stems and high flower quality. While Mammoth types are early bloomers and less day-length sensitive, they still require high light levels to prevent flower bud drop. Avoid excessive heat in the greenhouse, which can lead to stunted growth or premature crop failure.
Pinching
Pinch the plants once they reach approximately 4 to 6 inches in height to encourage better basal branching, which significantly increases the total flower yield.
Spacing
For professional cut flower production, space your plants 6 to 12 inches apart. Because Mammoth Scarlet is a vigorous climber, you must provide mechanical support, such as 6-foot tall netting or a wire trellis, to keep the stems straight and prevent the vines from tangling into an unmanageable mass.
Pests
Closely monitor your crop for aphids, thrips, and spider mites.
Disease
The most common issues are powdery mildew and botrytis, especially when humidity is 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 Scarlet Quick Reference Guide
4 Inch crop time
6-8 Weeks
10 Inch crop time
8-10 Weeks
Bloom Period
Spring, Summer
Color
Red
Habit
Upright
Height
5-7 Feet
Light
Full Sun
Minimum Temp
45
Perennial Zone
-
Water Needs
Moderate
Patented Plant
No
Current
Availability
Current Availability
08-17-2026 (Week 34)
0
08-24-2026 (Week 35)
0
08-31-2026 (Week 36)
0
09-07-2026 (Week 37)
0
09-14-2026 (Week 38)
0
09-21-2026 (Week 39)
4,200
09-28-2026 (Week 40)
4,200
10-05-2026 (Week 41)
4,200
10-12-2026 (Week 42)
4,200
10-19-2026 (Week 43)
4,200
10-26-2026 (Week 44)
4,200
11-02-2026 (Week 45)
4,200
11-09-2026 (Week 46)
4,200
11-16-2026 (Week 47)
4,200
11-23-2026 (Week 48)
4,200
11-30-2026 (Week 49)
4,200
12-07-2026 (Week 50)
4,200
12-14-2026 (Week 51)
4,200
12-21-2026 (Week 52)
4,200
12-28-2026 (Week 53)
4,200
01-04-2027 (Week 01)
4,200
01-11-2027 (Week 02)
4,200
01-18-2027 (Week 03)
4,200
01-25-2027 (Week 04)
4,200
02-01-2027 (Week 05)
4,200
02-08-2027 (Week 06)
4,200
02-15-2027 (Week 07)
4,200
02-22-2027 (Week 08)
4,200
03-01-2027 (Week 09)
4,200
03-08-2027 (Week 10)
0
03-15-2027 (Week 11)
4,200
03-22-2027 (Week 12)
4,200
03-29-2027 (Week 13)
4,200
04-05-2027 (Week 14)
4,200
04-12-2027 (Week 15)
4,200
04-19-2027 (Week 16)
4,200
04-26-2027 (Week 17)
0
05-03-2027 (Week 18)
0
05-10-2027 (Week 19)
0
Mammoth Scarlet, also known as Lathyrus odoratus, is a vigorous climbing annual originally native to the Mediterranean region [49, context]. This professional-tier cultivar is part of the "Mammoth" series, specifically bred for the cut flower industry to provide earlier blooms, larger flower sizes, and exceptionally long, sturdy stems. These plants can reach a mature height of 60 to 72 inches with support, producing masses of ruffled, intensely scarlet-red flowers that release a powerful, sweet fragrance from late spring through early summer [context]. Thriving in full sun and rich, well-drained soil, Mammoth Scarlet is a staple for vertical garden displays and premium, high-value cut flower production. For a striking spring arrangement, consider pairing it with companions like larkspur (Delphinium), blue snapdragons, or Ammi majus.
Mammoth Scarlet Selling Tips
Sell Mammoth Scarlet to customers who are looking for high-impact color, premium fragrance, and vertical drama for their spring gardens. The Mammoth series is highly valued because it is less sensitive to day length, allowing it to bloom earlier in the spring and giving your customers a head start on the season. Home gardeners will love the bold look of the scarlet vines climbing up a garden obelisk or trellis, while florists will prize the saturated color and long vase life for high-end spring bouquets. Remind your customers that frequent cutting actually encourages more blooms, providing them with weeks of vibrant, fragrant indoor displays.
Coach Your Customer Plant in a sunny location with rich, well-drained soil as soon as the ground can be worked in the spring, as these plants love cool temperatures. Provide a sturdy trellis, fence, or netting immediately after planting, as these vines need a structure to climb as they grow. Keep the soil consistently moist and apply mulch around the base of the plants to keep the root systems cool as the weather warms up. Pick the flowers often; removing the blooms for bouquets stimulates the plant to produce even more flowering stems. These are cool-season annuals that will eventually decline 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 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. Sweet peas are cool-weather crops, so keep daytime temperatures between 55 and 65°F and night temperatures around 45 to 50°F to ensure thick, strong stems and high flower quality. While Mammoth types are early bloomers and less day-length sensitive, they still require high light levels to prevent flower bud drop. Avoid excessive heat in the greenhouse, which can lead to stunted growth or premature crop failure.
Pinching
Pinch the plants once they reach approximately 4 to 6 inches in height to encourage better basal branching, which significantly increases the total flower yield.
Spacing
For professional cut flower production, space your plants 6 to 12 inches apart. Because Mammoth Scarlet is a vigorous climber, you must provide mechanical support, such as 6-foot tall netting or a wire trellis, to keep the stems straight and prevent the vines from tangling into an unmanageable mass.
Pests
Closely monitor your crop for aphids, thrips, and spider mites.
Disease
The most common issues are powdery mildew and botrytis, especially when humidity is 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 Scarlet Quick Reference Guide
4 Inch crop time
6-8 Weeks
10 Inch crop time
8-10 Weeks
Bloom Period
Spring, Summer
Color
Red
Habit
Upright
Height
5-7 Feet
Light
Full Sun
Minimum Temp
45
Perennial Zone
-
Water Needs
Moderate
Patented Plant
No
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